Clang（發音為/ˈklæŋ/類似英文單字*clang*[4]） 是一個C、C++、Objective-C和Objective-C++程式語言的編譯器前端。它採用了LLVM作為其後端，由LLVM2.6開始，一起釋出新版本。它的目標是提供一個GNU編譯器套裝（GCC）的替代品，支援了GNU編譯器大多數的編譯設定以及非官方語言的擴充功能。作者是克里斯·拉特納（Chris Lattner），在蘋果公司的贊助支援下進行開發，而原始碼授權是使用類BSD的伊利諾伊大學厄巴納-香檳分校開原始碼許可。
此篇不是要討論 Clang，而是利用 Clang 進行 Cross-compilation。
當無法製作出 toolchain，這將是最後一個方法。
不過要注意 Clang 只是編譯器前端，像是要編譯 aarch64 時，就得先安裝 gcc-aarch64-linux-gnu。編譯 mipsel 時，就得安裝 gcc-mipsel-linux-gnu。
Host: Ubuntu 20.04 x86_64
$ sudo apt install -y sed make binutils gcc g++ bash patch gzip bzip2 perl tar cpio python unzip rsync wget libncurses-dev
# install clang
$ sudo apt install -y clang
$ clang --version
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin$ sudo apt install -y clang-8
$ sudo apt install -y clang-10
$ sudo apt install -y clang-12
# 移除不必要的
$ sudo apt remove -y clang-8# use llvm
$ wget https://apt.llvm.org/llvm.sh
$ chmod u+x llvm.sh
$ export PJ_CLANG_VER=19
$ sudo ./llvm.sh $PJ_CLANG_VER
# if you want to remove
$ sudo rm /etc/apt/sources.list.d/archive_uri-http_apt_llvm_org_*.list
$ sudo rm /etc/apt/trusted.gpg.d/apt.llvm.org.asc
$ export PJ_CLANG_VER=10
$ sudo apt remove --autoremove \
clang-$PJ_CLANG_VER \
lldb-$PJ_CLANG_VER \
lld-$PJ_CLANG_VER \
clangd-$PJ_CLANG_VER$ ll /usr/bin/clang*
# clang-10
$ export PJ_CLANG_VER=10
$ sudo update-alternatives \
--install /usr/bin/clang clang /usr/bin/clang-$PJ_CLANG_VER \
1 \
--slave /usr/bin/clang++ clang++ /usr/bin/clang++-$PJ_CLANG_VER
$ export PJ_CLANG_VER=12
$ sudo update-alternatives \
--install /usr/bin/clang clang /usr/bin/clang-$PJ_CLANG_VER \
2 \
--slave /usr/bin/clang++ clang++ /usr/bin/clang++-$PJ_CLANG_VER
# clang-19
$ export PJ_CLANG_VER=19
$ sudo update-alternatives \
--install /usr/bin/clang clang /usr/bin/clang-$PJ_CLANG_VER \
3 \
--slave /usr/bin/clang++ clang++ /usr/bin/clang++-$PJ_CLANG_VER
$ update-alternatives --list clang
/usr/bin/clang-10
/usr/bin/clang-12
/usr/bin/clang-19
$ sudo update-alternatives --config clang
There are 3 choices for the alternative clang (providing /usr/bin/clang).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/clang-19 3 auto mode
1 /usr/bin/clang-10 1 manual mode
2 /usr/bin/clang-12 2 manual mode
3 /usr/bin/clang-19 3 manual mode
Press <enter> to keep the current choice[*], or type selection number: 0
# or
$ sudo update-alternatives --set clang /usr/bin/clang-19# to check again
$ ll /usr/bin/clang
lrwxrwxrwx 1 root root 23 五 3 21:46 /usr/bin/clang -> /etc/alternatives/clang*
$ ll /etc/alternatives/clang
lrwxrwxrwx 1 root root 17 五 3 22:07 /etc/alternatives/clang -> /usr/bin/clang-19*
$ sudo update-alternatives --remove clang /usr/bin/clang-10
$ sudo update-alternatives --remove-all clangThe basic option is to define the target architecture. For that, use
-target <triple>. If you don’t specify the target, CPU names won’t match (since Clang assumes the host triple), and the compilation will go ahead, creating code for the host platform, which will break later on when assembling or linking.
The triple has the general format
<arch><sub>-<vendor>-<sys>-<env>, where:
arch=x86_64,i386,arm,thumb,mips, etc.sub= for ex. on ARM:v5,v6m,v7a,v7m, etc.vendor=pc,apple,nvidia,ibm, etc.sys=none,linux,win32,darwin,cuda, etc.env=eabi,gnu,android,macho,elf, etc.
$ cd /tmp
$ vi helloworld.c
#include <stdio.h>
int main(int argc, char *argv[])
{
printf("Hello World !!!\n");
return 0;
}$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.6 LTS
Release: 20.04
Codename: focalflowchart TD
subgraph ubuntu[Ubuntu 20.04 x86_64]
helloworld-x86
end
$ clang helloworld.c -o helloworld-x86
$ file helloworld-x86
helloworld-x86: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=643a3d1e2069a6486cffa608975e8dce5b8a93db, for GNU/Linux 3.2.0, not stripped
$ ./helloworld-x86
Hello World !!!flowchart TD
subgraph ubuntu[Ubuntu 20.04 x86_64]
helloworld-aarch64[qemu-aarch64 helloworld-aarch64]
end
$ sudo apt install -y gcc-aarch64-linux-gnu
$ clang --target=aarch64-linux-gnu \
-O0 -fPIC \
-mcpu=cortex-a53 -march=armv8-a+crc+crypto \
-B$STAGING_DIR/lib \
--sysroot=$STAGING_DIR \
helloworld.c -o helloworld-aarch64
$ file helloworld-aarch64
helloworld-aarch64: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=aab08d684927e20530e3840b154d93c298dd1d06, for GNU/Linux 3.7.0, not stripped# run with qemu
$ sudo apt install qemu-user qemu-user-static
$ LD_LIBRARY_PATH=$PJ_SYSROOT/lib qemu-aarch64 $PJ_SYSROOT/lib/ld-linux-aarch64.so.1 /tmp/helloworld-aarch64
Hello world !!!flowchart TD
subgraph ubuntu[Ubuntu 20.04 x86_64]
helloworld-aarch64[qemu-mipsel helloworld-mipsel]
end
# MSB
$ sudo apt install -y gcc-mips-linux-gnu
# LSB
$ sudo apt install -y gcc-mipsel-linux-gnu
$ clang --target=mipsel-linux-gnu \
-O0 -fPIC \
-mcpu=mips32 \
-B$STAGING_DIR/lib \
-isysroot $PJ_SYSROOT \
helloworld.c -o helloworld-mipsel
$ file helloworld-mipsel
helloworld: ELF 32-bit LSB shared object, MIPS, MIPS32 rel2 version 1 (SYSV), dynamically linked, interpreter /lib/ld.so.1, BuildID[sha1]=e54ec828f9cb6f824a62ced7a602c7b3231fc84c, for GNU/Linux 3.2.0, not stripped# run with qemu
$ sudo apt install qemu-user qemu-user-static
$ LD_LIBRARY_PATH=$PJ_SYSROOT/lib qemu-mipsel $PJ_SYSROOT/lib/ld.so.1 /tmp/helloworld-mipsel
Hello World !!!# Please scp helloworld from Ubuntu -> Pi
$ helloworld
Hello world !!!# Ubuntu 20.04
$ cd /usr/lib/x86_64-linux-gnu
$ ll libLLVM.so*
$ sudo ln -s ../llvm-19/lib/libLLVM.so.1 libLLVM.so.19.1$ clang --version
Ubuntu clang version 19.0.0 (++20240421052952+48324f0f7b26-1~exp1~20240421173100.1000)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin$ clang --help
OVERVIEW: clang LLVM compiler
USAGE: clang [options] file...
OPTIONS:
-### Print (but do not run) the commands to run for this compilation
--amdgpu-arch-tool=<value>
Tool used for detecting AMD GPU arch in the system.
--analyzer-output <value>
Static analyzer report output format (html|plist|plist-multi-file|plist-html|sarif|sarif-html|text).
--analyze Run the static analyzer
-arcmt-migrate-emit-errors
Emit ARC errors even if the migrator can fix them
-arcmt-migrate-report-output <value>
Output path for the plist report
-B <prefix> Search $prefix$file for executables, libraries, and data files. If $prefix is a directory, search $prefix/$file
-b <arg> Pass -b <arg> to the linker on AIX
-CC Include comments from within macros in preprocessed output
-cl-denorms-are-zero OpenCL only. Allow denormals to be flushed to zero.
-cl-ext=<value> OpenCL only. Enable or disable OpenCL extensions/optional features. The argument is a comma-separated sequence of one or more extension names, each prefixed by '+' or '-'.
-cl-fast-relaxed-math OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines __FAST_RELAXED_MATH__.
-cl-finite-math-only OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf.
-cl-fp32-correctly-rounded-divide-sqrt
OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded.
-cl-kernel-arg-info OpenCL only. Generate kernel argument metadata.
-cl-mad-enable OpenCL only. Allow use of less precise MAD computations in the generated binary.
-cl-no-signed-zeros OpenCL only. Allow use of less precise no signed zeros computations in the generated binary.
-cl-no-stdinc OpenCL only. Disables all standard includes containing non-native compiler types and functions.
-cl-opt-disable OpenCL only. This option disables all optimizations. By default optimizations are enabled.
-cl-single-precision-constant
OpenCL only. Treat double precision floating-point constant as single precision constant.
-cl-std=<value> OpenCL language standard to compile for.
-cl-strict-aliasing OpenCL only. This option is added for compatibility with OpenCL 1.0.
-cl-uniform-work-group-size
OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel
-cl-unsafe-math-optimizations
OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable.
--config=<file> Specify configuration file
--cuda-compile-host-device
Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations.
--cuda-device-only Compile CUDA code for device only
--cuda-feature=<value> Manually specify the CUDA feature to use
--cuda-host-only Compile CUDA code for host only. Has no effect on non-CUDA compilations.
--cuda-include-ptx=<value>
Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
--cuda-noopt-device-debug
Enable device-side debug info generation. Disables ptxas optimizations.
--cuda-path-ignore-env Ignore environment variables to detect CUDA installation
--cuda-path=<value> CUDA installation path
-cuid=<value> An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. It is used to externalize device-side static varia bles for single source offloading languages CUDA and HIP so that they can be accessed by the host code of the same compilation unit.
-cxx-isystem <directory>
Add directory to the C++ SYSTEM include search path
-C Include comments in preprocessed output
-c Only run preprocess, compile, and assemble steps
-darwin-target-variant-triple <value>
Specify the darwin target variant triple
-darwin-target-variant <value>
Generate code for an additional runtime variant of the deployment target
-dD Print macro definitions in -E mode in addition to normal output
-dependency-dot <value> Filename to write DOT-formatted header dependencies to
-dependency-file <value>
Filename (or -) to write dependency output to
-dI Print include directives in -E mode in addition to normal output
-dM Print macro definitions in -E mode instead of normal output
-dsym-dir <dir> Directory to output dSYM's (if any) to
-dumpdir <dumppfx> Use <dumpfpx> as a prefix to form auxiliary and dump file names
-dumpmachine Display the compiler's target processor
-dumpversion Display the version of the compiler
-D <macro>=<value> Define <macro> to <value> (or 1 if <value> omitted)
-emit-ast Emit Clang AST files for source inputs
--emit-extension-symbol-graphs
Generate additional symbol graphs for extended modules.
-emit-interface-stubs Generate Interface Stub Files.
-emit-llvm Use the LLVM representation for assembler and object files
-emit-merged-ifs Generate Interface Stub Files, emit merged text not binary.
--emit-static-lib Enable linker job to emit a static library.
-emit-symbol-graph Generate Extract API information as a side effect of compilation.
--end-no-unused-arguments
Start emitting warnings for unused driver arguments
--extract-api-ignores=<value>
Comma separated list of files containing a new line separated list of API symbols to ignore when extracting API information.
-extract-api Extract API information
-E Only run the preprocessor
-faapcs-bitfield-load Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only).
-faapcs-bitfield-width Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only).
-faddrsig Emit an address-significance table
-falign-loops=<N> N must be a power of two. Align loops to the boundary
-faligned-allocation Enable C++17 aligned allocation functions
-fallow-editor-placeholders
Treat editor placeholders as valid source code
-faltivec-src-compat=<value>
Source-level compatibility for Altivec vectors (for PowerPC targets). This includes results of vector comparison (scalar for 'xl', vector for 'gcc') as well as behavior when initializing with a scalar (splatting for 'xl', element zero only for 'gcc'). For 'mixed', the compatibility is as 'gcc' for 'vector bool/vector pixel' and as 'xl' for other types. Current default is 'mixed'.
-fansi-escape-codes Use ANSI escape codes for diagnostics
-fapinotes-modules Enablemodule-based external API notes support
-fapinotes-swift-version=<version>
Specify the Swift version to use when filtering API notes
-fapinotes Enableexternal API notes support
-fapple-kext Use Apple's kernel extensions ABI
-fapple-link-rtlib Force linking the clang builtins runtime library
-fapple-pragma-pack Enable Apple gcc-compatible #pragma pack handling
-fapplication-extension Restrict code to those available for App Extensions
-fapprox-func Allow certain math function calls to be replaced with an approximately equivalent calculation
-fassume-nothrow-exception-dtor
Assume that exception objects' destructors are non-throwing
-fasync-exceptions Enable EH Asynchronous exceptions
-fauto-import MinGW specific. Enable code generation support for automatic dllimport, and enable support for it in the linker. Enabled by default.
-fbasic-block-address-map
Emit the basic block address map section.
-fbasic-block-sections=<value>
Place each function's basic blocks in unique sections (ELF Only)
-fbinutils-version=<major.minor>
Produced object files can use all ELF features supported by this binutils version and newer. If -fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means that all ELF features can be used, regardless of binutils support. Defaults to 2.26.
-fblocks Enable the 'blocks' language feature
-fborland-extensions Accept non-standard constructs supported by the Borland compiler
-fbuild-session-file=<file>
Use the last modification time of <file> as the build session timestamp
-fbuild-session-timestamp=<time since Epoch in seconds>
Time when the current build session started
-fbuiltin-module-map Load the clang builtins module map file.
-fc++-abi=<value> C++ ABI to use. This will override the target C++ ABI.
-fcall-saved-x10 Make the x10 register call-saved (AArch64 only)
-fcall-saved-x11 Make the x11 register call-saved (AArch64 only)
-fcall-saved-x12 Make the x12 register call-saved (AArch64 only)
-fcall-saved-x13 Make the x13 register call-saved (AArch64 only)
-fcall-saved-x14 Make the x14 register call-saved (AArch64 only)
-fcall-saved-x15 Make the x15 register call-saved (AArch64 only)
-fcall-saved-x18 Make the x18 register call-saved (AArch64 only)
-fcall-saved-x8 Make the x8 register call-saved (AArch64 only)
-fcall-saved-x9 Make the x9 register call-saved (AArch64 only)
-fcaret-diagnostics-max-lines=<value>
Set the maximum number of source lines to show in a caret diagnostic (0 = no limit).
-fcf-protection=<value> Instrument control-flow architecture protection
-fcf-protection Enable cf-protection in 'full' mode
-fchar8_t Enable C++ builtin type char8_t
-fcheck-new Do not assume C++ operator new may not return NULL
-fclang-abi-compat=<version>
Attempt to match the ABI of Clang <version>
-fcolor-diagnostics Enable colors in diagnostics
-fcomment-block-commands=<arg>
Treat each comma separated argument in <arg> as a documentation comment block command
-fcommon Place uninitialized global variables in a common block
-fcomplete-member-pointers
Require member pointer base types to be complete if they would be significant under the Microsoft ABI
-fconstexpr-backtrace-limit=<value>
Set the maximum number of entries to print in a constexpr evaluation backtrace (0 = no limit)
-fconstexpr-depth=<value>
Set the maximum depth of recursive constexpr function calls
-fconstexpr-steps=<value>
Set the maximum number of steps in constexpr function evaluation
-fcoro-aligned-allocation
Prefer aligned allocation for C++ Coroutines
-fcoroutines Enable support for the C++ Coroutines
-fcoverage-compilation-dir=<value>
The compilation directory to embed in the coverage mapping.
-fcoverage-mapping Generate coverage mapping to enable code coverage analysis
-fcoverage-mcdc Enable MC/DC criteria when generating code coverage
-fcoverage-prefix-map=<old>=<new>
remap file source paths <old> to <new> in coverage mapping. If there are multiple options, prefix replacement is applied in reverse order starting from the last one
-fcrash-diagnostics-dir=<dir>
Put crash-report files in <dir>
-fcrash-diagnostics=<value>
Set level of crash diagnostic reporting, (option: off, compiler, all)
-fcrash-diagnostics Enable crash diagnostic reporting (default)
-fcs-profile-generate=<directory>
Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fcs-profile-generate Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fcuda-short-ptr Use 32-bit pointers for accessing const/local/shared address spaces
-fcx-fortran-rules Range reduction is enabled for complex arithmetic operations.
-fcx-limited-range Basic algebraic expansions of complex arithmetic operations involving are enabled.
-fcxx-exceptions Enable C++ exceptions
-fcxx-modules Enable modules for C++
-fdata-sections Place each data in its own section
-fdebug-compilation-dir=<value>
The compilation directory to embed in the debug info
-fdebug-default-version=<value>
Default DWARF version to use, if a -g option caused DWARF debug info to be produced
-fdebug-info-for-profiling
Emit extra debug info to make sample profile more accurate
-fdebug-macro Emit macro debug information
-fdebug-prefix-map=<old>=<new>
For paths in debug info, remap directory <old> to <new>. If multiple options match a path, the last option wins
-fdebug-ranges-base-address
Use DWARF base address selection entries in .debug_ranges
-fdebug-types-section Place debug types in their own section (ELF Only)
-fdeclspec Allow __declspec as a keyword
-fdefine-target-os-macros
Enable predefined target OS macros
-fdelayed-template-parsing
Parse templated function definitions at the end of the translation unit
-fdelete-null-pointer-checks
Treat usage of null pointers as undefined behavior (default)
-fdiagnostics-absolute-paths
Print absolute paths in diagnostics
-fdiagnostics-hotness-threshold=<value>
Prevent optimization remarks from being output if they do not have at least this profile count. Use 'auto' to apply the threshold from profile summary
-fdiagnostics-misexpect-tolerance=<value>
Prevent misexpect diagnostics from being output if the profile counts are within N% of the expected.
-fdiagnostics-parseable-fixits
Print fix-its in machine parseable form
-fdiagnostics-print-source-range-info
Print source range spans in numeric form
-fdiagnostics-show-hotness
Enable profile hotness information in diagnostic line
-fdiagnostics-show-note-include-stack
Display include stacks for diagnostic notes
-fdiagnostics-show-option
Print option name with mappable diagnostics
-fdiagnostics-show-template-tree
Print a template comparison tree for differing templates
-fdigraphs Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default)
-fdirect-access-external-data
Don't use GOT indirection to reference external data symbols
-fdiscard-value-names Discard value names in LLVM IR
-fdollars-in-identifiers
Allow '$' in identifiers
-fdriver-only Only run the driver.
-fdwarf-exceptions Use DWARF style exceptions
-feliminate-unused-debug-types
Do not emit debug info for defined but unused types
-fembed-bitcode-marker Embed placeholder LLVM IR data as a marker
-fembed-bitcode=<option>
Embed LLVM bitcode
-fembed-bitcode Embed LLVM IR bitcode as data
-fembed-offload-object=<value>
Embed Offloading device-side binary into host object file as a section.
-femit-all-decls Emit all declarations, even if unused
-femit-compact-unwind-non-canonical
Try emitting Compact-Unwind for non-canonical entries. Maybe overriden by other constraints
-femit-dwarf-unwind=<value>
When to emit DWARF unwind (EH frame) info
-femulated-tls Use emutls functions to access thread_local variables
-fenable-matrix Enable matrix data type and related builtin functions
-fexceptions Enable support for exception handling
-fexcess-precision=<value>
Allows control over excess precision on targets where native support for the precision types is not available. By default, excess precision is used to calculate intermediate results following the rules specified in ISO C99.
-fexperimental-library Control whether unstable and experimental library features are enabled. This option enables various library features that are either experimental (also known as TSes), or have been but are not stable yet in the selected Standard Library implementation. It is not recommended to use this option in production code, since neither ABI nor API stability are guaranteed. This is intended to provide a preview of features that will ship in the future for experimentation purposes
-fexperimental-modules-reduced-bmi
Generate the reduced BMI
-fexperimental-new-constant-interpreter
Enable the experimental new constant interpreter
-fexperimental-openacc-macro-override <value>
Overrides the _OPENACC macro value for experimental testing during OpenACC support development
-fexperimental-relative-c++-abi-vtables
Use the experimental C++ class ABI for classes with virtual tables
-fexperimental-sanitize-metadata-ignorelist=<value>
Disable sanitizer metadata for modules and functions that match the provided special case list
-fexperimental-sanitize-metadata=<value>
Specify the type of metadata to emit for binary analysis sanitizers
-fexperimental-strict-floating-point
Enables the use of non-default rounding modes and non-default exception handling on targets that are not currently ready.
-fextend-arguments=<value>
Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions
-ffast-math Allow aggressive, lossy floating-point optimizations
-ffat-lto-objects Enable fat LTO object support
-ffile-compilation-dir=<value>
The compilation directory to embed in the debug info and coverage mapping.
-ffile-prefix-map=<value>
remap file source paths in debug info, predefined preprocessor macros and __builtin_FILE(). Implies -ffile-reproducible.
-ffile-reproducible Use the target's platform-specific path separator character when expanding the __FILE__ macro
-ffine-grained-bitfield-accesses
Use separate accesses for consecutive bitfield runs with legal widths and alignments.
-ffinite-loops Assume all loops are finite.
-ffinite-math-only Allow floating-point optimizations that assume arguments and results are not NaNs or +-inf. This defines the \_\_FINITE\_MATH\_ONLY\_\_ preprocessor macro.
-ffixed-a0 Reserve the a0 register (M68k only)
-ffixed-a1 Reserve the a1 register (M68k only)
-ffixed-a2 Reserve the a2 register (M68k only)
-ffixed-a3 Reserve the a3 register (M68k only)
-ffixed-a4 Reserve the a4 register (M68k only)
-ffixed-a5 Reserve the a5 register (M68k only)
-ffixed-a6 Reserve the a6 register (M68k only)
-ffixed-d0 Reserve the d0 register (M68k only)
-ffixed-d1 Reserve the d1 register (M68k only)
-ffixed-d2 Reserve the d2 register (M68k only)
-ffixed-d3 Reserve the d3 register (M68k only)
-ffixed-d4 Reserve the d4 register (M68k only)
-ffixed-d5 Reserve the d5 register (M68k only)
-ffixed-d6 Reserve the d6 register (M68k only)
-ffixed-d7 Reserve the d7 register (M68k only)
-ffixed-g1 Reserve the G1 register (SPARC only)
-ffixed-g2 Reserve the G2 register (SPARC only)
-ffixed-g3 Reserve the G3 register (SPARC only)
-ffixed-g4 Reserve the G4 register (SPARC only)
-ffixed-g5 Reserve the G5 register (SPARC only)
-ffixed-g6 Reserve the G6 register (SPARC only)
-ffixed-g7 Reserve the G7 register (SPARC only)
-ffixed-i0 Reserve the I0 register (SPARC only)
-ffixed-i1 Reserve the I1 register (SPARC only)
-ffixed-i2 Reserve the I2 register (SPARC only)
-ffixed-i3 Reserve the I3 register (SPARC only)
-ffixed-i4 Reserve the I4 register (SPARC only)
-ffixed-i5 Reserve the I5 register (SPARC only)
-ffixed-l0 Reserve the L0 register (SPARC only)
-ffixed-l1 Reserve the L1 register (SPARC only)
-ffixed-l2 Reserve the L2 register (SPARC only)
-ffixed-l3 Reserve the L3 register (SPARC only)
-ffixed-l4 Reserve the L4 register (SPARC only)
-ffixed-l5 Reserve the L5 register (SPARC only)
-ffixed-l6 Reserve the L6 register (SPARC only)
-ffixed-l7 Reserve the L7 register (SPARC only)
-ffixed-o0 Reserve the O0 register (SPARC only)
-ffixed-o1 Reserve the O1 register (SPARC only)
-ffixed-o2 Reserve the O2 register (SPARC only)
-ffixed-o3 Reserve the O3 register (SPARC only)
-ffixed-o4 Reserve the O4 register (SPARC only)
-ffixed-o5 Reserve the O5 register (SPARC only)
-ffixed-point Enable fixed point types
-ffixed-r19 Reserve register r19 (Hexagon only)
-ffixed-r9 Reserve the r9 register (ARM only)
-ffixed-x10 Reserve the x10 register (AArch64/RISC-V only)
-ffixed-x11 Reserve the x11 register (AArch64/RISC-V only)
-ffixed-x12 Reserve the x12 register (AArch64/RISC-V only)
-ffixed-x13 Reserve the x13 register (AArch64/RISC-V only)
-ffixed-x14 Reserve the x14 register (AArch64/RISC-V only)
-ffixed-x15 Reserve the x15 register (AArch64/RISC-V only)
-ffixed-x16 Reserve the x16 register (AArch64/RISC-V only)
-ffixed-x17 Reserve the x17 register (AArch64/RISC-V only)
-ffixed-x18 Reserve the x18 register (AArch64/RISC-V only)
-ffixed-x19 Reserve the x19 register (AArch64/RISC-V only)
-ffixed-x1 Reserve the x1 register (AArch64/RISC-V only)
-ffixed-x20 Reserve the x20 register (AArch64/RISC-V only)
-ffixed-x21 Reserve the x21 register (AArch64/RISC-V only)
-ffixed-x22 Reserve the x22 register (AArch64/RISC-V only)
-ffixed-x23 Reserve the x23 register (AArch64/RISC-V only)
-ffixed-x24 Reserve the x24 register (AArch64/RISC-V only)
-ffixed-x25 Reserve the x25 register (AArch64/RISC-V only)
-ffixed-x26 Reserve the x26 register (AArch64/RISC-V only)
-ffixed-x27 Reserve the x27 register (AArch64/RISC-V only)
-ffixed-x28 Reserve the x28 register (AArch64/RISC-V only)
-ffixed-x29 Reserve the x29 register (AArch64/RISC-V only)
-ffixed-x2 Reserve the x2 register (AArch64/RISC-V only)
-ffixed-x30 Reserve the x30 register (AArch64/RISC-V only)
-ffixed-x31 Reserve the x31 register (AArch64/RISC-V only)
-ffixed-x3 Reserve the x3 register (AArch64/RISC-V only)
-ffixed-x4 Reserve the x4 register (AArch64/RISC-V only)
-ffixed-x5 Reserve the x5 register (AArch64/RISC-V only)
-ffixed-x6 Reserve the x6 register (AArch64/RISC-V only)
-ffixed-x7 Reserve the x7 register (AArch64/RISC-V only)
-ffixed-x8 Reserve the x8 register (AArch64/RISC-V only)
-ffixed-x9 Reserve the x9 register (AArch64/RISC-V only)
-fforce-check-cxx20-modules-input-files
Check the input source files from C++20 modules explicitly
-fforce-dwarf-frame Always emit a debug frame section
-fforce-emit-vtables Emits more virtual tables to improve devirtualization
-fforce-enable-int128 Enable support for int128_t type
-ffp-contract=<value> Form fused FP ops (e.g. FMAs)
-ffp-eval-method=<value>
Specifies the evaluation method to use for floating-point arithmetic.
-ffp-exception-behavior=<value>
Specifies the exception behavior of floating-point operations.
-ffp-model=<value> Controls the semantics of floating-point calculations.
-ffreestanding Assert that the compilation takes place in a freestanding environment
-ffuchsia-api-level=<value>
Set Fuchsia API level
-ffunction-sections Place each function in its own section
-fglobal-isel Enables the global instruction selector
-fgnu-keywords Allow GNU-extension keywords regardless of language standard
-fgnu-runtime Generate output compatible with the standard GNU Objective-C runtime
-fgnu89-inline Use the gnu89 inline semantics
-fgnuc-version=<value> Sets various macros to claim compatibility with the given GCC version (default is 4.2.1)
-fgpu-allow-device-init Allow device side init function in HIP (experimental)
-fgpu-approx-transcendentals
Use approximate transcendental functions
-fgpu-default-stream=<value>
Specify default stream. The default value is 'legacy'. (CUDA/HIP only)
-fgpu-defer-diag Defer host/device related diagnostic messages for CUDA/HIP
-fgpu-flush-denormals-to-zero
Flush denormal floating point values to zero in CUDA/HIP device mode.
-fgpu-rdc Generate relocatable device code, also known as separate compilation mode
-fgpu-sanitize Enable sanitizer for supported offloading devices
-fhip-emit-relocatable Compile HIP source to relocatable
-fhip-fp32-correctly-rounded-divide-sqrt
Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only)
-fhip-kernel-arg-name Specify that kernel argument names are preserved (HIP only)
-fhip-new-launch-api Use new kernel launching API for HIP
-fhonor-infinities Specify that floating-point optimizations are not allowed that assume arguments and results are not +-inf.
-fhonor-nans Specify that floating-point optimizations are not allowed that assume arguments and results are not NANs.
-fignore-exceptions Enable support for ignoring exception handling constructs
-fimplicit-module-maps Implicitly search the file system for module map files.
-fincremental-extensions
Enable incremental processing extensions such as processingstatements on the global scope.
-finline-functions Inline suitable functions
-finline-hint-functions Inline functions which are (explicitly or implicitly) marked inline
-finline-max-stacksize=<value>
Suppress inlining of functions whose stack size exceeds the given value
-finput-charset=<value> Specify the default character set for source files
-finstrument-function-entry-bare
Instrument function entry only, after inlining, without arguments to the instrumentation call
-finstrument-functions-after-inlining
Like -finstrument-functions, but insert the calls after inlining
-finstrument-functions Generate calls to instrument function entry and exit
-fintegrated-as Enable the integrated assembler
-fintegrated-cc1 Run cc1 in-process
-fintegrated-objemitter Use internal machine object code emitter.
-fjmc Enable just-my-code debugging
-fjump-tables Use jump tables for lowering switches
-fkeep-persistent-storage-variables
Enable keeping all variables that have a persistent storage duration, including global, static and thread-local variables, to guarantee that they can be directly addressed
-fkeep-static-consts Keep static const variables even if unused
-fkeep-system-includes Instead of expanding system headers when emitting preprocessor output, preserve the #include directive. Useful when producing preprocessed output for test case reduction. May produce incorrect output if preprocessor symbols that control the included content (e.g. _XOPEN_SOURCE) are defined in the including source file. The portability of the resulting source to other compilation environments is not guaranteed.
Only valid with -E.
-flax-vector-conversions=<value>
Enable implicit vector bit-casts
-flto-jobs=<value> Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected)
-flto=auto Enable LTO in 'full' mode
-flto=jobserver Enable LTO in 'full' mode
-flto=<value> Set LTO mode
-flto Enable LTO in 'full' mode
-fmacro-backtrace-limit=<value>
Set the maximum number of entries to print in a macro expansion backtrace (0 = no limit)
-fmacro-prefix-map=<value>
remap file source paths in predefined preprocessor macros and __builtin_FILE(). Implies -ffile-reproducible.
-fmath-errno Require math functions to indicate errors by setting errno
-fmax-tokens=<value> Max total number of preprocessed tokens for -Wmax-tokens.
-fmax-type-align=<value>
Specify the maximum alignment to enforce on pointers lacking an explicit alignment
-fmemory-profile-use=<pathname>
Use memory profile for profile-guided memory optimization
-fmemory-profile=<directory>
Enable heap memory profiling and dump results into <directory>
-fmemory-profile Enable heap memory profiling
-fmerge-all-constants Allow merging of constants
-fmessage-length=<value>
Format message diagnostics so that they fit within N columns
-fminimize-whitespace Ignore the whitespace from the input file when emitting preprocessor output. It will only contain whitespace when necessary, e.g. to keep two minus signs from merging into to an increment operator. Useful with the -P option to normalize whitespace such that two files with only formatting changes are equal.
Only valid with -E on C-like inputs and incompatible with -traditional-cpp.
-fmodule-file=[<name>=]<file>
Specify the mapping of module name to precompiled module file, or load a module file if name is omitted.
-fmodule-header=<kind> Build a C++20 Header Unit from a header that should be found in the user (fmodule-header=user) or system (fmodule-header=system) search path.
-fmodule-header Build a C++20 Header Unit from a header
-fmodule-map-file=<file>
Load this module map file
-fmodule-name=<name> Specify the name of the module to build
-fmodule-output=<value> Save intermediate module file results when compiling a standard C++ module unit.
-fmodule-output Save intermediate module file results when compiling a standard C++ module unit.
-fmodules-cache-path=<directory>
Specify the module cache path
-fmodules-decluse Require declaration of modules used within a module
-fmodules-disable-diagnostic-validation
Disable validation of the diagnostic options when loading the module
-fmodules-ignore-macro=<value>
Ignore the definition of the given macro when building and loading modules
-fmodules-prune-after=<seconds>
Specify the interval (in seconds) after which a module file will be considered unused
-fmodules-prune-interval=<seconds>
Specify the interval (in seconds) between attempts to prune the module cache
-fmodules-search-all Search even non-imported modules to resolve references
-fmodules-strict-decluse
Like -fmodules-decluse but requires all headers to be in modules
-fmodules-user-build-path <directory>
Specify the module user build path
-fmodules-validate-input-files-content
Validate PCM input files based on content if mtime differs
-fmodules-validate-once-per-build-session
Don't verify input files for the modules if the module has been successfully validated or loaded during this build session
-fmodules-validate-system-headers
Validate the system headers that a module depends on when loading the module
-fmodules Enable the 'modules' language feature
-fms-compatibility-version=<value>
Dot-separated value representing the Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fms-compatibility Enable full Microsoft Visual C++ compatibility
-fms-extensions Accept some non-standard constructs supported by the Microsoft compiler
-fms-hotpatch Ensure that all functions can be hotpatched at runtime
-fms-runtime-lib=<value>
Select Windows run-time library
-fms-volatile Volatile loads and stores have acquire and release semantics
-fmsc-version=<value> Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fnew-alignment=<align> Specifies the largest alignment guaranteed by '::operator new(size_t)'
-fnew-infallible Enable treating throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). This is detectable in source.
-fno-aapcs-bitfield-width
Do not follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only).
-fno-access-control Disable C++ access control
-fno-addrsig Don't emit an address-significance table
-fno-apinotes-modules Disablemodule-based external API notes support
-fno-apinotes Disableexternal API notes support
-fno-assume-sane-operator-new
Don't assume that C++'s global operator new can't alias any pointer
-fno-assume-unique-vtables
Disable optimizations based on vtable pointer identity
-fno-assumptions Disable codegen and compile-time checks for C++23's [[assume]] attribute
-fno-auto-import MinGW specific. Disable support for automatic dllimport in code generation and linking
-fno-autolink Disable generation of linker directives for automatic library linking
-fno-builtin-<value> Disable implicit builtin knowledge of a specific function
-fno-builtin Disable implicit builtin knowledge of functions
-fno-c++-static-destructors
Disable C++ static destructor registration
-fno-char8_t Disable C++ builtin type char8_t
-fno-color-diagnostics Disable colors in diagnostics
-fno-common Compile common globals like normal definitions
-fno-complete-member-pointers
Do not require member pointer base types to be complete if they would be significant under the Microsoft ABI
-fno-constant-cfstrings Disable creation of CodeFoundation-type constant strings
-fno-convergent-functions
Assume all functions may be convergent.
-fno-coverage-mapping Disable code coverage analysis
-fno-coverage-mcdc Disable MC/DC coverage criteria
-fno-crash-diagnostics Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash
-fno-cx-fortran-rules Range reduction is disabled for complex arithmetic operations
-fno-cx-limited-range Basic algebraic expansions of complex arithmetic operations involving are disabled.
-fno-cxx-modules Disable modules for C++
-fno-debug-macro Do not emit macro debug information
-fno-declspec Disallow __declspec as a keyword
-fno-define-target-os-macros
Disable predefined target OS macros
-fno-delayed-template-parsing
Disable delayed template parsing
-fno-delete-null-pointer-checks
Do not treat usage of null pointers as undefined behavior
-fno-diagnostics-fixit-info
Do not include fixit information in diagnostics
-fno-diagnostics-show-line-numbers
Show line numbers in diagnostic code snippets
-fno-digraphs Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:'
-fno-direct-access-external-data
Use GOT indirection to reference external data symbols
-fno-discard-value-names
Do not discard value names in LLVM IR
-fno-dollars-in-identifiers
Disallow '$' in identifiers
-fno-elide-constructors Disable C++ copy constructor elision
-fno-elide-type Do not elide types when printing diagnostics
-fno-eliminate-unused-debug-types
Emit debug info for defined but unused types
-fno-exceptions Disable support for exception handling
-fno-experimental-relative-c++-abi-vtables
Do not use the experimental C++ class ABI for classes with virtual tables
-fno-experimental-sanitize-metadata=<value>
Disable emitting metadata for binary analysis sanitizers
-fno-fat-lto-objects Disable fat LTO object support
-fno-file-reproducible Use the host's platform-specific path separator character when expanding the __FILE__ macro
-fno-fine-grained-bitfield-accesses
Use large-integer access for consecutive bitfield runs.
-fno-finite-loops Do not assume that any loop is finite.
-fno-fixed-point Disable fixed point types
-fno-force-enable-int128
Disable support for int128_t type
-fno-global-isel Disables the global instruction selector
-fno-gnu-inline-asm Disable GNU style inline asm
-fno-gpu-allow-device-init
Don't allow device side init function in HIP (experimental)
-fno-gpu-approx-transcendentals
Don't use approximate transcendental functions
-fno-gpu-defer-diag Don't defer host/device related diagnostic messages for CUDA/HIP
-fno-hip-emit-relocatable
Do not override toolchain to compile HIP source to relocatable
-fno-hip-fp32-correctly-rounded-divide-sqrt
Don't specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only)
-fno-hip-kernel-arg-name
Don't specify that kernel argument names are preserved (HIP only)
-fno-hip-new-launch-api Don't use new kernel launching API for HIP
-fno-integrated-as Disable the integrated assembler
-fno-integrated-cc1 Spawn a separate process for each cc1
-fno-integrated-objemitter
Use external machine object code emitter.
-fno-jump-tables Do not use jump tables for lowering switches
-fno-keep-persistent-storage-variables
Disable keeping all variables that have a persistent storage duration, including global, static and thread-local variables, to guarantee that they can be directly addressed
-fno-keep-static-consts Don't keep static const variables even if unused
-fno-knr-functions Disable support for K&R C function declarations
-fno-lto Disable LTO mode (default)
-fno-memory-profile Disable heap memory profiling
-fno-merge-all-constants
Disallow merging of constants
-fno-modules-check-relocated<value>
Skip checks for relocated modules when loading PCM files
-fno-modules-validate-textual-header-includes
Do not enforce -fmodules-decluse and private header restrictions for textual headers. This flag will be removed in a future Clang release.
-fno-new-infallible Disable treating throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). This is detectable in source.
-fno-objc-avoid-heapify-local-blocks
Don't try to avoid heapifying local blocks
-fno-objc-infer-related-result-type
do not infer Objective-C related result type based on method family
-fno-offload-lto Disable LTO mode (default) for offload compilation
-fno-offload-uniform-block
Don't assume that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise)
-fno-openmp-extensions Disable all Clang extensions for OpenMP directives and clauses
-fno-operator-names Do not treat C++ operator name keywords as synonyms for operators
-fno-optimize-sibling-calls
Disable tail call optimization, keeping the call stack accurate
-fno-pch-codegen Do not generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fno-pch-debuginfo Do not generate debug info for types in an object file built from this PCH and do not generate them elsewhere
-fno-plt Use GOT indirection instead of PLT to make external function calls (x86 only)
-fno-preserve-as-comments
Do not preserve comments in inline assembly
-fno-profile-generate Disable generation of profile instrumentation.
-fno-profile-instr-generate
Disable generation of profile instrumentation.
-fno-profile-instr-use Disable using instrumentation data for profile-guided optimization
-fno-pseudo-probe-for-profiling
Do not emit pseudo probes for sample profiling
-fno-register-global-dtors-with-atexit
Don't use atexit or __cxa_atexit to register global destructors
-fno-rtlib-add-rpath Do not add -rpath with architecture-specific resource directory to the linker flags. When --hip-link is specified, do not add -rpath with HIP runtime library directory to the linker flags
-fno-rtti-data Disable generation of RTTI data
-fno-rtti Disable generation of rtti information
-fno-sanitize-address-globals-dead-stripping
Disable linker dead stripping of globals in AddressSanitizer
-fno-sanitize-address-outline-instrumentation
Use default code inlining logic for the address sanitizer
-fno-sanitize-address-poison-custom-array-cookie
Disable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fno-sanitize-address-use-after-scope
Disable use-after-scope detection in AddressSanitizer
-fno-sanitize-address-use-odr-indicator
Disable ODR indicator globals
-fno-sanitize-cfi-canonical-jump-tables
Do not make the jump table addresses canonical in the symbol table
-fno-sanitize-cfi-cross-dso
Disable control flow integrity (CFI) checks for cross-DSO calls.
-fno-sanitize-coverage=<value>
Disable features of coverage instrumentation for Sanitizers
-fno-sanitize-hwaddress-experimental-aliasing
Disable aliasing mode in HWAddressSanitizer
-fno-sanitize-ignorelist
Don't use ignorelist file for sanitizers
-fno-sanitize-memory-param-retval
Disable detection of uninitialized parameters and return values
-fno-sanitize-memory-track-origins
Disable origins tracking in MemorySanitizer
-fno-sanitize-memory-use-after-dtor
Disable use-after-destroy detection in MemorySanitizer
-fno-sanitize-recover=<value>
Disable recovery for specified sanitizers
-fno-sanitize-stable-abi
Conventional ABI instrumentation for sanitizer runtime. Default: Conventional
-fno-sanitize-stats Disable sanitizer statistics gathering.
-fno-sanitize-thread-atomics
Disable atomic operations instrumentation in ThreadSanitizer
-fno-sanitize-thread-func-entry-exit
Disable function entry/exit instrumentation in ThreadSanitizer
-fno-sanitize-thread-memory-access
Disable memory access instrumentation in ThreadSanitizer
-fno-sanitize-trap=<value>
Disable trapping for specified sanitizers
-fno-sanitize-trap Disable trapping for all sanitizers
-fno-short-wchar Force wchar_t to be an unsigned int
-fno-show-column Do not include column number on diagnostics
-fno-show-source-location
Do not include source location information with diagnostics
-fno-signed-char char is unsigned
-fno-signed-zeros Allow optimizations that ignore the sign of floating point zeros
-fno-skip-odr-check-in-gmf
Perform ODR checks for decls in the global module fragment.
-fno-spell-checking Disable spell-checking
-fno-split-machine-functions
Disable late function splitting using profile information (x86 ELF)
-fno-split-stack Wouldn't use segmented stack
-fno-stack-clash-protection
Disable stack clash protection
-fno-stack-protector Disable the use of stack protectors
-fno-standalone-debug Limit debug information produced to reduce size of debug binary
-fno-strict-aliasing Disable optimizations based on strict aliasing rules
-fno-strict-float-cast-overflow
Relax language rules and try to match the behavior of the target's native float-to-int conversion instructions
-fno-strict-return Don't treat control flow paths that fall off the end of a non-void function as unreachable
-fno-sycl Disables SYCL kernels compilation for device
-fno-temp-file Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes
-fno-threadsafe-statics Do not emit code to make initialization of local statics thread safe
-fno-trigraphs Do not process trigraph sequences
-fno-unified-lto Use distinct LTO pipelines
-fno-unique-section-names
Don't use unique names for text and data sections
-fno-unroll-loops Turn off loop unroller
-fno-use-cxa-atexit Don't use __cxa_atexit for calling destructors
-fno-use-init-array Use .ctors/.dtors instead of .init_array/.fini_array
-fno-verify-intermediate-code
Disable verification of LLVM IR
-fno-visibility-inlines-hidden-static-local-var
Disables -fvisibility-inlines-hidden-static-local-var (this is the default on non-darwin targets)
-fno-xray-function-index
Omit function index section at the expense of single-function patching performance
-fno-zero-initialized-in-bss
Don't place zero initialized data in BSS
-fobjc-arc-exceptions Use EH-safe code when synthesizing retains and releases in -fobjc-arc
-fobjc-arc Synthesize retain and release calls for Objective-C pointers
-fobjc-avoid-heapify-local-blocks
Try to avoid heapifying local blocks
-fobjc-disable-direct-methods-for-testing
Ignore attribute objc_direct so that direct methods can be tested
-fobjc-encode-cxx-class-template-spec
Fully encode c++ class template specialization
-fobjc-exceptions Enable Objective-C exceptions
-fobjc-runtime=<value> Specify the target Objective-C runtime kind and version
-fobjc-weak Enable ARC-style weak references in Objective-C
-foffload-implicit-host-device-templates
Template functions or specializations without host, device and global attributes have implicit host device attributes (CUDA/HIP only)
-foffload-lto=<value> Set LTO mode for offload compilation
-foffload-lto Enable LTO in 'full' mode for offload compilation
-foffload-uniform-block Assume that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise)
-fomit-frame-pointer Omit the frame pointer from functions that don't need it. Some stack unwinding cases, such as profilers and sanitizers, may prefer specifying -fno-omit-frame-pointer. On many targets, -O1 and higher omit the frame pointer by default. -m[no-]omit-leaf-frame-pointer takes precedence for leaf functions
-fopenacc Enable OpenACC
-fopenmp-extensions Enable all Clang extensions for OpenMP directives and clauses
-fopenmp-force-usm Force behvaior as if the user specified pragma omp requires unified_shared_memory.
-fopenmp-offload-mandatory
Do not create a host fallback if offloading to the device fails.
-fopenmp-simd Emit OpenMP code only for SIMD-based constructs.
-fopenmp-target-debug Enable debugging in the OpenMP offloading device RTL
-fopenmp-target-jit Emit code that can be JIT compiled for OpenMP offloading. Implies -foffload-lto=full
-fopenmp-targets=<value>
Specify comma-separated list of triples OpenMP offloading targets to be supported
-fopenmp-version=<value>
Set OpenMP version (e.g. 45 for OpenMP 4.5, 51 for OpenMP 5.1). Default value is 51 for Clang
-fopenmp Parse OpenMP pragmas and generate parallel code.
-foperator-arrow-depth=<value>
Maximum number of 'operator->'s to call for a member access
-foptimization-record-file=<file>
Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options.
-foptimization-record-passes=<regex>
Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes)
-forder-file-instrumentation
Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
-fpack-struct=<value> Specify the default maximum struct packing alignment
-fpascal-strings Recognize and construct Pascal-style string literals
-fpass-plugin=<dsopath> Load pass plugin from a dynamic shared object file (only with new pass manager).
-fpatchable-function-entry=<N,M>
Generate M NOPs before function entry and N-M NOPs after function entry
-fpcc-struct-return Override the default ABI to return all structs on the stack
-fpch-codegen Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fpch-debuginfo Generate debug info for types in an object file built from this PCH and do not generate them elsewhere
-fpch-instantiate-templates
Instantiate templates already while building a PCH
-fpch-validate-input-files-content
Validate PCH input files based on content if mtime differs
-fplugin-arg-<name>-<arg>
Pass <arg> to plugin <name>
-fplugin=<dsopath> Load the named plugin (dynamic shared object)
-fprebuilt-implicit-modules
Look up implicit modules in the prebuilt module path
-fprebuilt-module-path=<directory>
Specify the prebuilt module path
-fproc-stat-report=<value>
Save subprocess statistics to the given file
-fproc-stat-report<value>
Print subprocess statistics
-fprofile-arcs Instrument code to produce gcov data files (*.gcda)
-fprofile-exclude-files=<value>
Instrument only functions from files where names don't match all the regexes separated by a semi-colon
-fprofile-filter-files=<value>
Instrument only functions from files where names match any regex separated by a semi-colon
-fprofile-function-groups=<N>
Partition functions into N groups and select only functions in group i to be instrumented using -fprofile-selected-function-group
-fprofile-generate=<directory>
Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fprofile-generate Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fprofile-instr-generate=<file>
Generate instrumented code to collect execution counts into <file> (overridden by LLVM_PROFILE_FILE env var)
-fprofile-instr-generate
Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
-fprofile-instr-use=<value>
Use instrumentation data for profile-guided optimization
-fprofile-list=<value> Filename defining the list of functions/files to instrument. The file uses the sanitizer special case list format.
-fprofile-remapping-file=<file>
Use the remappings described in <file> to match the profile data against names in the program
-fprofile-sample-accurate
Specifies that the sample profile is accurate
-fprofile-sample-use=<value>
Enable sample-based profile guided optimizations
-fprofile-selected-function-group=<i>
Partition functions into N groups using -fprofile-function-groups and select only functions in group i to be instrumented. The valid range is 0 to N-1 inclusive
-fprofile-update=<method>
Set update method of profile counters
-fprofile-use=<pathname>
Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>.
-fprotect-parens Determines whether the optimizer honors parentheses when floating-point expressions are evaluated
-fpseudo-probe-for-profiling
Emit pseudo probes for sample profiling
-fptrauth-intrinsics Enable pointer authentication intrinsics
-frandomize-layout-seed-file=<file>
File holding the seed used by the randomize structure layout feature
-frandomize-layout-seed=<seed>
The seed used by the randomize structure layout feature
-freciprocal-math Allow division operations to be reassociated
-freg-struct-return Override the default ABI to return small structs in registers
-fregister-global-dtors-with-atexit
Use atexit or __cxa_atexit to register global destructors
-frelaxed-template-template-args
Enable C++17 relaxed template template argument matching
-fropi Generate read-only position independent code (ARM only)
-frtlib-add-rpath Add -rpath with architecture-specific resource directory to the linker flags. When --hip-link is specified, also add -rpath with HIP runtime library directory to the linker flags
-frwpi Generate read-write position independent code (ARM only)
-fsafe-buffer-usage-suggestions
Display suggestions to update code associated with -Wunsafe-buffer-usage warnings
-fsample-profile-use-profi
Use profi to infer block and edge counts
-fsanitize-address-destructor=<value>
Set the kind of module destructors emitted by AddressSanitizer instrumentation. These destructors are emitted to unregister instrumented global variables when code is unloaded (e.g. via `dlclose()`).
-fsanitize-address-field-padding=<value>
Level of field padding for AddressSanitizer
-fsanitize-address-globals-dead-stripping
Enable linker dead stripping of globals in AddressSanitizer
-fsanitize-address-outline-instrumentation
Always generate function calls for address sanitizer instrumentation
-fsanitize-address-poison-custom-array-cookie
Enable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fsanitize-address-use-after-return=<mode>
Select the mode of detecting stack use-after-return in AddressSanitizer
-fsanitize-address-use-after-scope
Enable use-after-scope detection in AddressSanitizer
-fsanitize-address-use-odr-indicator
Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size
-fsanitize-cfi-canonical-jump-tables
Make the jump table addresses canonical in the symbol table
-fsanitize-cfi-cross-dso
Enable control flow integrity (CFI) checks for cross-DSO calls.
-fsanitize-cfi-icall-experimental-normalize-integers
Normalize integers in CFI indirect call type signature checks
-fsanitize-cfi-icall-generalize-pointers
Generalize pointers in CFI indirect call type signature checks
-fsanitize-coverage-allowlist=<value>
Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones
-fsanitize-coverage-ignorelist=<value>
Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones
-fsanitize-coverage=<value>
Specify the type of coverage instrumentation for Sanitizers
-fsanitize-hwaddress-abi=<value>
Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused.
-fsanitize-hwaddress-experimental-aliasing
Enable aliasing mode in HWAddressSanitizer
-fsanitize-ignorelist=<value>
Path to ignorelist file for sanitizers
-fsanitize-memory-param-retval
Enable detection of uninitialized parameters and return values
-fsanitize-memory-track-origins=<value>
Enable origins tracking in MemorySanitizer
-fsanitize-memory-track-origins
Enable origins tracking in MemorySanitizer
-fsanitize-memory-use-after-dtor
Enable use-after-destroy detection in MemorySanitizer
-fsanitize-memtag-mode=<value>
Set default MTE mode to 'sync' (default) or 'async'
-fsanitize-recover=<value>
Enable recovery for specified sanitizers
-fsanitize-stable-abi Stable ABI instrumentation for sanitizer runtime. Default: Conventional
-fsanitize-stats Enable sanitizer statistics gathering.
-fsanitize-system-ignorelist=<value>
Path to system ignorelist file for sanitizers
-fsanitize-thread-atomics
Enable atomic operations instrumentation in ThreadSanitizer (default)
-fsanitize-thread-func-entry-exit
Enable function entry/exit instrumentation in ThreadSanitizer (default)
-fsanitize-thread-memory-access
Enable memory access instrumentation in ThreadSanitizer (default)
-fsanitize-trap=<value> Enable trapping for specified sanitizers
-fsanitize-trap Enable trapping for all sanitizers
-fsanitize-undefined-strip-path-components=<number>
Strip (or keep only, if negative) a given number of path components when emitting check metadata.
-fsanitize=<check> Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks
-fsave-optimization-record=<format>
Generate an optimization record file in a specific format
-fsave-optimization-record
Generate a YAML optimization record file
-fseh-exceptions Use SEH style exceptions
-fshort-enums Allocate to an enum type only as many bytes as it needs for the declared range of possible values
-fshort-wchar Force wchar_t to be a short unsigned int
-fshow-overloads=<value>
Which overload candidates to show when overload resolution fails. Defaults to 'all'
-fshow-skipped-includes Show skipped includes in -H output.
-fsigned-char char is signed
-fsized-deallocation Enable C++14 sized global deallocation functions
-fsjlj-exceptions Use SjLj style exceptions
-fskip-odr-check-in-gmf Skip ODR checks for decls in the global module fragment.
-fslp-vectorize Enable the superword-level parallelism vectorization passes
-fspell-checking-limit=<value>
Set the maximum number of times to perform spell checking on unrecognized identifiers (0 = no limit)
-fsplit-dwarf-inlining Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF
-fsplit-lto-unit Enables splitting of the LTO unit
-fsplit-machine-functions
Enable late function splitting using profile information (x86 ELF)
-fsplit-stack Use segmented stack
-fstack-clash-protection
Enable stack clash protection
-fstack-protector-all Enable stack protectors for all functions
-fstack-protector-strong
Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable
-fstack-protector Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable.
-fstack-size-section Emit section containing metadata on function stack sizes
-fstack-usage Emit .su file containing information on function stack sizes
-fstandalone-debug Emit full debug info for all types used by the program
-fstrict-aliasing Enable optimizations based on strict aliasing rules
-fstrict-enums Enable optimizations based on the strict definition of an enum's value range
-fstrict-flex-arrays=<n>
Enable optimizations based on the strict definition of flexible arrays
-fstrict-float-cast-overflow
Assume that overflowing float-to-int casts are undefined (default)
-fstrict-vtable-pointers
Enable optimizations based on the strict rules for overwriting polymorphic C++ objects
-fswift-async-fp=<option>
Control emission of Swift async extended frame info
-fsycl Enables SYCL kernels compilation for device
-fsyntax-only Run the preprocessor, parser and semantic analysis stages
-fsystem-module Build this module as a system module. Only used with -emit-module
-ftemplate-backtrace-limit=<value>
Set the maximum number of entries to print in a template instantiation backtrace (0 = no limit)
-ftemplate-depth=<value>
Set the maximum depth of recursive template instantiation
-ftest-coverage Produce gcov notes files (*.gcno)
-fthin-link-bitcode=<value>
Write minimized bitcode to <file> for the ThinLTO thin link only
-fthinlto-index=<value> Perform ThinLTO importing using provided function summary index
-ftime-report=<value> (For new pass manager) 'per-pass': one report for each pass; 'per-pass-run': one report for each pass invocation
-ftime-trace-granularity=<value>
Minimum time granularity (in microseconds) traced by time profiler
-ftime-trace=<value> Similar to -ftime-trace. Specify the JSON file or a directory which will contain the JSON file
-ftime-trace Turn on time profiler. Generates JSON file based on output filename.
-ftrap-function=<value> Issue call to specified function rather than a trap instruction
-ftrapv-handler=<function name>
Specify the function to be called on overflow
-ftrapv Trap on integer overflow
-ftrigraphs Process trigraph sequences
-ftrivial-auto-var-init-max-size=<value>
Stop initializing trivial automatic stack variables if var size exceeds the specified number of instances (in bytes)
-ftrivial-auto-var-init-stop-after=<value>
Stop initializing trivial automatic stack variables after the specified number of instances
-ftrivial-auto-var-init=<value>
Initialize trivial automatic stack variables. Defaults to 'uninitialized'
-funified-lto Use the unified LTO pipeline
-funique-basic-block-section-names
Use unique names for basic block sections (ELF Only)
-funique-internal-linkage-names
Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path
-funroll-loops Turn on loop unroller
-funsafe-math-optimizations
Allow unsafe floating-point math optimizations which may decrease precision
-fuse-cuid=<value> Method to generate ID's for compilation units for single source offloading languages CUDA and HIP: 'hash' (ID's generated by hashing file path and command line options) | 'random' (ID's generated as random numbers) | 'none' (disabled). Default is 'hash'. This option will be overridden by option '-cuid=[ID]' if it is specified.
-fuse-line-directives Use #line in preprocessed output
-fvalidate-ast-input-files-content
Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical
-fveclib=<value> Use the given vector functions library
-fvectorize Enable the loop vectorization passes
-fverbose-asm Generate verbose assembly output
-fverify-intermediate-code
Enable verification of LLVM IR
-fvirtual-function-elimination
Enables dead virtual function elimination optimization. Requires -flto=full
-fvisibility-dllexport=<value>
The visibility for dllexport definitions. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility-externs-dllimport=<value>
The visibility for dllimport external declarations. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility-externs-nodllstorageclass=<value>
The visibility for external declarations without an explicit DLL storage class. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility-from-dllstorageclass
Override the visibility of globals based on their final DLL storage class.
-fvisibility-global-new-delete-hidden
Give global C++ operator new and delete declarations hidden visibility
-fvisibility-global-new-delete=<value>
The visibility for global C++ operator new and delete declarations. If 'source' is specified the visibility is not adjusted
-fvisibility-inlines-hidden-static-local-var
When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default
-fvisibility-inlines-hidden
Give inline C++ member functions hidden visibility by default
-fvisibility-ms-compat Give global types 'default' visibility and global functions and variables 'hidden' visibility by default
-fvisibility-nodllstorageclass=<value>
The visibility for definitions without an explicit DLL storage class. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility=<value> Set the default symbol visibility for all global definitions
-fwasm-exceptions Use WebAssembly style exceptions
-fwhole-program-vtables Enables whole-program vtable optimization. Requires -flto
-fwrapv Treat signed integer overflow as two's complement
-fwritable-strings Store string literals as writable data
-fxl-pragma-pack Enable IBM XL #pragma pack handling
-fxray-always-emit-customevents
Always emit __xray_customevent(...) calls even if the containing function is not always instrumented
-fxray-always-emit-typedevents
Always emit __xray_typedevent(...) calls even if the containing function is not always instrumented
-fxray-always-instrument=<value>
DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute.
-fxray-attr-list=<value>
Filename defining the list of functions/types for imbuing XRay attributes.
-fxray-function-groups=<value>
Only instrument 1 of N groups
-fxray-ignore-loops Don't instrument functions with loops unless they also meet the minimum function size
-fxray-instruction-threshold=<value>
Sets the minimum function size to instrument with XRay
-fxray-instrumentation-bundle=<value>
Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'. 'function' includes both 'function-entry' and 'function-exit'.
-fxray-instrument Generate XRay instrumentation sleds on function entry and exit
-fxray-link-deps Link XRay runtime library when -fxray-instrument is specified (default)
-fxray-modes=<value> List of modes to link in by default into XRay instrumented binaries.
-fxray-never-instrument=<value>
DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute.
-fxray-selected-function-group=<value>
When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1
-fzero-call-used-regs=<value>
Clear call-used registers upon function return (AArch64/x86 only)
-fzvector Enable System z vector language extension
-F <value> Add directory to framework include search path
--gcc-install-dir=<value>
Use GCC installation in the specified directory. The directory ends with path components like 'lib{,32,64}/gcc{,-cross}/$triple/$version'. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation
--gcc-toolchain=<value> Specify a directory where Clang can find 'include' and 'lib{,32,64}/gcc{,-cross}/$triple/$version'. Clang will use the GCC installation with the largest version
--gcc-triple=<value> Search for the GCC installation with the specified triple.
-gcodeview-command-line Emit compiler path and command line into CodeView debug information
-gcodeview-ghash Emit type record hashes in a .debug$H section
-gcodeview Generate CodeView debug information
-gdwarf-2 Generate source-level debug information with dwarf version 2
-gdwarf-3 Generate source-level debug information with dwarf version 3
-gdwarf-4 Generate source-level debug information with dwarf version 4
-gdwarf-5 Generate source-level debug information with dwarf version 5
-gdwarf32 Enables DWARF32 format for ELF binaries, if debug information emission is enabled.
-gdwarf64 Enables DWARF64 format for ELF binaries, if debug information emission is enabled.
-gdwarf Generate source-level debug information with the default dwarf version
-gembed-source Embed source text in DWARF debug sections
-gen-reproducer=<value> Emit reproducer on (option: off, crash (default), error, always)
-gline-directives-only Emit debug line info directives only
-gline-tables-only Emit debug line number tables only
-gmodules Generate debug info with external references to clang modules or precompiled headers
-gno-codeview-command-line
Don't emit compiler path and command line into CodeView debug information
-gno-embed-source Restore the default behavior of not embedding source text in DWARF debug sections
-gno-inline-line-tables Don't emit inline line tables.
--gpu-bundle-output Bundle output files of HIP device compilation
--gpu-instrument-lib=<value>
Instrument device library for HIP, which is a LLVM bitcode containing __cyg_profile_func_enter and __cyg_profile_func_exit
--gpu-max-threads-per-block=<value>
Default max threads per block for kernel launch bounds for HIP
-gpulibc Link the LLVM C Library for GPUs
-gsplit-dwarf=<value> Set DWARF fission mode
-gstrict-dwarf Restrict DWARF features to those defined in the specified version, avoiding features from later versions.
-gz=<value> DWARF debug sections compression type
-G <size> Put objects of at most <size> bytes into small data section (MIPS / Hexagon)
-g Generate source-level debug information
--help-hidden Display help for hidden options
-help Display available options
--hip-device-lib=<value>
HIP device library
--hip-link Link clang-offload-bundler bundles for HIP
--hip-path=<value> HIP runtime installation path, used for finding HIP version and adding HIP include path.
--hip-version=<value> HIP version in the format of major.minor.patch
--hipspv-pass-plugin=<dsopath>
path to a pass plugin for HIP to SPIR-V passes.
--hipstdpar-interpose-alloc
Replace all memory allocation / deallocation calls with hipManagedMalloc / hipFree equivalents
--hipstdpar-path=<value>
HIP Standard Parallel Algorithm Acceleration library path, used for finding and implicitly including the library header
--hipstdpar-prim-path=<value>
rocPrim path, required by the HIP Standard Parallel Algorithm Acceleration library, used to implicitly include the rocPrim library
--hipstdpar-thrust-path=<value>
rocThrust path, required by the HIP Standard Parallel Algorithm Acceleration library, used to implicitly include the rocThrust library
--hipstdpar Enable HIP acceleration for standard parallel algorithms
-H Show header includes and nesting depth
-I- Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path
-iapinotes-modules <directory>
Add directory to the API notes search path referenced by module name
-ibuiltininc Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it
-idirafter <value> Add directory to AFTER include search path
-iframeworkwithsysroot <directory>
Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot
-iframework <value> Add directory to SYSTEM framework search path
-imacros <file> Include macros from file before parsing
-include-pch <file> Include precompiled header file
-include <file> Include file before parsing
-index-header-map Make the next included directory (-I or -F) an indexer header map
-iprefix <dir> Set the -iwithprefix/-iwithprefixbefore prefix
-iquote <directory> Add directory to QUOTE include search path
-isysroot <dir> Set the system root directory (usually /)
-isystem-after <directory>
Add directory to end of the SYSTEM include search path
-isystem <directory> Add directory to SYSTEM include search path
-ivfsoverlay <value> Overlay the virtual filesystem described by file over the real file system
-iwithprefixbefore <dir>
Set directory to include search path with prefix
-iwithprefix <dir> Set directory to SYSTEM include search path with prefix
-iwithsysroot <directory>
Add directory to SYSTEM include search path, absolute paths are relative to -isysroot
-I <dir> Add directory to the end of the list of include search paths
--libomptarget-amdgcn-bc-path=<value>
Path to libomptarget-amdgcn bitcode library
--libomptarget-amdgpu-bc-path=<value>
Path to libomptarget-amdgcn bitcode library
--libomptarget-nvptx-bc-path=<value>
Path to libomptarget-nvptx bitcode library
-L <dir> Add directory to library search path
-mabi=quadword-atomics Enable quadword atomics ABI on AIX (AIX PPC64 only). Uses lqarx/stqcx. instructions.
-mabicalls Enable SVR4-style position-independent code (Mips only)
-maix-small-local-exec-tls
Produce a faster access sequence for local-exec TLS variables where the offset from the TLS base is encoded as an immediate operand (AIX 64-bit only). This access sequence is not used for variables larger than 32KB.
-maix-struct-return Return all structs in memory (PPC32 only)
-malign-branch-boundary=<value>
Specify the boundary's size to align branches
-malign-branch=<value> Specify types of branches to align
-malign-double Align doubles to two words in structs (x86 only)
-maltivec Enable AltiVec vector initializer syntax
-mamdgpu-ieee Sets the IEEE bit in the expected default floating point mode register. Floating point opcodes that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008. This option changes the ABI. (AMDGPU only)
-mamdgpu-precise-memory-op
Enable precise memory mode (AMDGPU only)
-mapx-features=<value> Enable features of APX
-march=<value> For a list of available architectures for the target use '-mcpu=help'
-marm64x<value> Link as a hybrid ARM64X image
-mbackchain Link stack frames through backchain on System Z
-mbranch-protection=<value>
Enforce targets of indirect branches and function returns
-mbranches-within-32B-boundaries
Align selected branches (fused, jcc, jmp) within 32-byte boundary
-mcabac Enable CABAC instructions
-mcmse Allow use of CMSE (Armv8-M Security Extensions)
-mcode-object-version=<value>
Specify code object ABI version. Defaults to 5. (AMDGPU only)
-mconstructor-aliases Enable emitting complete constructors and destructors as aliases when possible
-mcpu=<value> For a list of available CPUs for the target use '-mcpu=help'
-mcrbits Control the CR-bit tracking feature on PowerPC. ``-mcrbits`` (the enablement of CR-bit tracking support) is the default for POWER8 and above, as well as for all other CPUs when optimization is applied (-O2 and above).
-mcrc Allow use of CRC instructions (ARM/Mips only)
-mcumode Specify CU wavefront execution mode (AMDGPU only)
-mdefault-visibility-export-mapping=<value>
Mapping between default visibility and export
-mdouble=<n Force double to be <n> bits
-MD Write a depfile containing user and system headers
-meabi <value> Set EABI type. Default depends on triple)
-membedded-data Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS)
-menable-experimental-extensions
Enable use of experimental RISC-V extensions.
-mexec-model=<value> Execution model (WebAssembly only)
-mexecute-only Disallow generation of data access to code sections (ARM only)
-mextern-sdata Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
-mfentry Insert calls to fentry at function entry (x86/SystemZ only)
-mfix-cmse-cve-2021-35465
Work around VLLDM erratum CVE-2021-35465 (ARM only)
-mfix-cortex-a53-835769 Workaround Cortex-A53 erratum 835769 (AArch64 only)
-mfix-cortex-a57-aes-1742098
Work around Cortex-A57 Erratum 1742098 (ARM only)
-mfix-cortex-a72-aes-1655431
Work around Cortex-A72 Erratum 1655431 (ARM only)
-mforced-sw-shadow-stack
Force using software shadow stack when shadow-stack enabled
-mfp32 Use 32-bit floating point registers (MIPS only)
-mfp64 Use 64-bit floating point registers (MIPS only)
-mframe-chain=<value> Select the frame chain model used to emit frame records (Arm only).
-mfunction-return=<value>
Replace returns with jumps to ``__x86_return_thunk`` (x86 only, error otherwise)
-MF <file> Write depfile output from -MMD, -MD, -MM, or -M to <file>
-mgeneral-regs-only Generate code which only uses the general purpose registers (AArch64/x86 only)
-mglobal-merge Enable merging of globals
-mgpopt Use GP relative accesses for symbols known to be in a small data section (MIPS)
-mguard=<value> Enable or disable Control Flow Guard checks and guard tables emission
-MG Add missing headers to depfile
-mharden-sls=<value> Select straight-line speculation hardening scope (ARM/AArch64/X86 only). <arg> must be: all, none, retbr(ARM/AArch64), blr(ARM/AArch64), comdat(ARM/AArch64), nocomdat(ARM/AArch64), return(X86), indirect-jmp(X86)
-mhvx-ieee-fp Enable Hexagon HVX IEEE floating-point
-mhvx-length=<value> Set Hexagon Vector Length
-mhvx-qfloat Enable Hexagon HVX QFloat instructions
-mhvx=<value> Enable Hexagon Vector eXtensions
-mhvx Enable Hexagon Vector eXtensions
-miamcu Use Intel MCU ABI
-mignore-xcoff-visibility
Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file
--migrate Run the migrator
-mincremental-linker-compatible
(integrated-as) Emit an object file which can be used with an incremental linker
-mindirect-branch-cs-prefix
Add cs prefix to call and jmp to indirect thunk
-mindirect-jump=<value> Change indirect jump instructions to inhibit speculation
-mios-version-min=<value>
Set iOS deployment target
-MJ <value> Write a compilation database entry per input
-mlasx Enable Loongson Advanced SIMD Extension (LASX).
-mllvm=<arg> Alias for -mllvm
-mllvm <value> Additional arguments to forward to LLVM's option processing
-mlocal-sdata Extend the -G behaviour to object local data (MIPS)
-mlong-calls Generate branches with extended addressability, usually via indirect jumps.
-mlong-double-128 Force long double to be 128 bits
-mlong-double-64 Force long double to be 64 bits
-mlong-double-80 Force long double to be 80 bits, padded to 128 bits for storage
-mlsx Enable Loongson SIMD Extension (LSX).
-mlvi-cfi Enable only control-flow mitigations for Load Value Injection (LVI)
-mlvi-hardening Enable all mitigations for Load Value Injection (LVI)
-mmacos-version-min=<value>
Set macOS deployment target
-mmadd4 Enable the generation of 4-operand madd.s, madd.d and related instructions.
-mmark-bti-property Add .note.gnu.property with BTI to assembly files (AArch64 only)
-MMD Write a depfile containing user headers
-mmemops Enable generation of memop instructions
-mmlir <value> Additional arguments to forward to MLIR's option processing
-mms-bitfields Set the default structure layout to be compatible with the Microsoft compiler standard
-mmsa Enable MSA ASE (MIPS only)
-mmt Enable MT ASE (MIPS only)
-MM Like -MMD, but also implies -E and writes to stdout by default
-mno-abicalls Disable SVR4-style position-independent code (Mips only)
-mno-amdgpu-precise-memory-op
Disable precise memory mode (AMDGPU only)
-mno-apx-features=<value>
Disable features of APX
-mno-bti-at-return-twice
Do not add a BTI instruction after a setjmp or other return-twice construct (Arm/AArch64 only)
-mno-constructor-aliases
Disable emitting complete constructors and destructors as aliases when possible
-mno-crc Disallow use of CRC instructions (Mips only)
-mno-cumode Specify WGP wavefront execution mode (AMDGPU only)
-mno-embedded-data Do not place constants in the .rodata section instead of the .sdata if they meet the -G <size> threshold (MIPS)
-mno-execute-only Allow generation of data access to code sections (ARM only)
-mno-extern-sdata Do not assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
-mno-fix-cmse-cve-2021-35465
Don't work around VLLDM erratum CVE-2021-35465 (ARM only)
-mno-fix-cortex-a53-835769
Don't workaround Cortex-A53 erratum 835769 (AArch64 only)
-mno-fix-cortex-a57-aes-1742098
Don't work around Cortex-A57 Erratum 1742098 (ARM only)
-mno-fix-cortex-a72-aes-1655431
Don't work around Cortex-A72 Erratum 1655431 (ARM only)
-mno-fmv Disable function multiversioning
-mno-forced-sw-shadow-stack
Not force using software shadow stack when shadow-stack enabled
-mno-gather Disable generation of gather instructions in auto-vectorization(x86 only)
-mno-global-merge Disable merging of globals
-mno-gpopt Do not use GP relative accesses for symbols known to be in a small data section (MIPS)
-mno-hvx-ieee-fp Disable Hexagon HVX IEEE floating-point
-mno-hvx-qfloat Disable Hexagon HVX QFloat instructions
-mno-hvx Disable Hexagon Vector eXtensions
-mno-implicit-float Don't generate implicit floating point or vector instructions
-mno-incremental-linker-compatible
(integrated-as) Emit an object file which cannot be used with an incremental linker
-mno-lasx Disable Loongson Advanced SIMD Extension (LASX).
-mno-local-sdata Do not extend the -G behaviour to object local data (MIPS)
-mno-long-calls Restore the default behaviour of not generating long calls
-mno-lsx Disable Loongson SIMD Extension (LSX).
-mno-lvi-cfi Disable control-flow mitigations for Load Value Injection (LVI)
-mno-lvi-hardening Disable mitigations for Load Value Injection (LVI)
-mno-madd4 Disable the generation of 4-operand madd.s, madd.d and related instructions.
-mno-memops Disable generation of memop instructions
-mno-movt Disallow use of movt/movw pairs (ARM only)
-mno-ms-bitfields Do not set the default structure layout to be compatible with the Microsoft compiler standard
-mno-msa Disable MSA ASE (MIPS only)
-mno-mt Disable MT ASE (MIPS only)
-mno-neg-immediates Disallow converting instructions with negative immediates to their negation or inversion.
-mno-nvj Disable generation of new-value jumps
-mno-nvs Disable generation of new-value stores
-mno-outline-atomics Don't generate local calls to out-of-line atomic operations
-mno-outline Disable function outlining (AArch64 only)
-mno-packets Disable generation of instruction packets
-mno-pic-data-is-text-relative
Don't assume data segments are relative to text segment
-mno-regnames Use only register numbers when writing assembly output
-mno-relax Disable linker relaxation
-mno-restrict-it Allow generation of complex IT blocks.
-mno-save-restore Disable using library calls for save and restore
-mno-scatter Disable generation of scatter instructions in auto-vectorization(x86 only)
-mno-seses Disable speculative execution side effect suppression (SESES)
-mno-stack-arg-probe Disable stack probes which are enabled by default
-mno-strict-align Allow memory accesses to be unaligned (AArch64/LoongArch/RISC-V only)
-mno-tgsplit Disable threadgroup split execution mode (AMDGPU only)
-mno-tls-direct-seg-refs
Disable direct TLS access through segment registers
-mno-tocdata=<value> Specifies a list of variables to be exempt from the TOC datatransformation.
-mno-tocdata This is the default. TOC data transformation is not applied to anyvariables. Only variables specified explicitly in -mtocdata= willhave the TOC data transformation.
-mno-unaligned-access Force all memory accesses to be aligned (AArch32/MIPSr6 only)
-mno-unaligned-symbols Expect external char-aligned symbols to be without ABI alignment (SystemZ only)
-mno-wavefrontsize64 Specify wavefront size 32 mode (AMDGPU only)
-mnocrc Disallow use of CRC instructions (ARM only)
-mnop-mcount Generate mcount/__fentry__ calls as nops. To activate they need to be patched in.
-mnvj Enable generation of new-value jumps
-mnvs Enable generation of new-value stores
-module-dependency-dir <value>
Directory to dump module dependencies to
-module-file-info Provide information about a particular module file
-momit-leaf-frame-pointer
Omit frame pointer setup for leaf functions
-moutline-atomics Generate local calls to out-of-line atomic operations
-moutline Enable function outlining (AArch64 only)
-mpacked-stack Use packed stack layout (SystemZ only).
-mpackets Enable generation of instruction packets
-mpad-max-prefix-size=<value>
Specify maximum number of prefixes to use for padding
-mpic-data-is-text-relative
Assume data segments are relative to text segment
-mprefer-vector-width=<value>
Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
-mprintf-kind=<value> Specify the printf lowering scheme (AMDGPU only), allowed values are "hostcall"(printing happens during kernel execution, this scheme relies on hostcalls which require system to support pcie atomics) and "buffered"(printing happens after all kernel threads exit, this uses a printf buffer and does not rely on pcie atomic support)
-MP Create phony target for each dependency (other than main file)
-mqdsp6-compat Enable hexagon-qdsp6 backward compatibility
-MQ <value> Specify name of main file output to quote in depfile
-mrecip=<value> Control use of approximate reciprocal and reciprocal square root instructions followed by <n> iterations of Newton-Raphson refinement. <value> = ( ['!'] ['vec-'] ('rcp'|'sqrt') [('h'|'s'|'d')] [':'<n>] ) | 'all' | 'default' | 'none'
-mrecip Equivalent to '-mrecip=all'
-mrecord-mcount Generate a __mcount_loc section entry for each __fentry__ call.
-mregnames Use full register names when writing assembly output
-mrelax-all (integrated-as) Relax all machine instructions
-mrelax Enable linker relaxation
-mrestrict-it Disallow generation of complex IT blocks. It is off by default.
-mrtd Make StdCall calling convention the default
-mrvv-vector-bits=<value>
Specify the size in bits of an RVV vector register
-msave-restore Enable using library calls for save and restore
-mseses Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations
-msign-return-address=<value>
Select return address signing scope
-mskip-rax-setup Skip setting up RAX register when passing variable arguments (x86 only)
-msmall-data-limit=<value>
Put global and static data smaller than the limit into a special section
-msoft-float Use software floating point
-mstack-alignment=<value>
Set the stack alignment
-mstack-arg-probe Enable stack probes
-mstack-probe-size=<value>
Set the stack probe size
-mstack-protector-guard-offset=<value>
Use the given offset for addressing the stack-protector guard
-mstack-protector-guard-reg=<value>
Use the given reg for addressing the stack-protector guard
-mstack-protector-guard-symbol=<value>
Use the given symbol for addressing the stack-protector guard
-mstack-protector-guard=<value>
Use the given guard (global, tls) for addressing the stack-protector guard
-mstackrealign Force realign the stack at entry to every function
-mstrict-align Force all memory accesses to be aligned (AArch64/LoongArch/RISC-V only)
-msve-vector-bits=<value>
Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only)
-msvr4-struct-return Return small structs in registers (PPC32 only)
-mtargetos=<value> Set the deployment target to be the specified OS and OS version
-mtgsplit Enable threadgroup split execution mode (AMDGPU only)
-mthread-model <value> The thread model to use. Defaults to 'posix')
-mtls-dialect=<value> Which thread-local storage dialect to use for dynamic accesses of TLS variables
-mtls-direct-seg-refs Enable direct TLS access through segment registers (default)
-mtls-size=<value> Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) | 24 (for 16MB, default) | 32 (for 4GB) | 48 (for 256TB, needs -mcmodel=large)
-mtocdata=<value> Specifies a list of variables to which the TOC data transformationwill be applied.
-mtocdata All suitable variables will have the TOC data transformation applied
-mtp=<value> Thread pointer access method. For AArch32: 'soft' uses a function call, or 'tpidrurw', 'tpidruro' or 'tpidrprw' use the three CP15 registers. 'cp15' is an alias for 'tpidruro'. For AArch64: 'tpidr_el0', 'tpidr_el1', 'tpidr_el2', 'tpidr_el3' or 'tpidrro_el0' use the five system registers. 'elN' is an alias for 'tpidr_elN'.
-mtune=<value> Only supported on AArch64, PowerPC, RISC-V, SPARC, SystemZ, and X86
-MT <value> Specify name of main file output in depfile
-munaligned-access Allow memory accesses to be unaligned (AArch32/MIPSr6 only)
-munaligned-symbols Expect external char-aligned symbols to be without ABI alignment (SystemZ only)
-munsafe-fp-atomics Enable generation of unsafe floating point atomic instructions. May generate more efficient code, but may not respect rounding and denormal modes, and may give incorrect results for certain memory destinations. (AMDGPU only)
-mvevpu Emit VPU instructions for VE
-MV Use NMake/Jom format for the depfile
-mwavefrontsize64 Specify wavefront size 64 mode (AMDGPU only)
-mxcoff-build-id=<0xHEXSTRING>
On AIX, request creation of a build-id string, "0xHEXSTRING", in the string table of the loader section inside the linked binary
-mxcoff-roptr Place constant objects with relocatable address values in the RO data section and add -bforceimprw to the linker flags (AIX only)
-mzos-hlq-clang=<ClangHLQ>
High level qualifier for z/OS C++RT side deck datasets
-mzos-hlq-csslib=<CsslibHLQ>
High level qualifier for z/OS CSSLIB dataset
-mzos-hlq-le=<LeHLQ> High level qualifier for z/OS Language Environment datasets
-mzos-sys-include=<SysInclude>
Path to system headers on z/OS
-M Like -MD, but also implies -E and writes to stdout by default
--no-cuda-include-ptx=<value>
Do not include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
--no-cuda-version-check Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture.
--no-default-config Disable loading default configuration files
--no-gpu-bundle-output Do not bundle output files of HIP device compilation
-no-hip-rt Do not link against HIP runtime libraries
--no-offload-arch=<value>
Remove CUDA/HIP offloading device architecture (e.g. sm_35, gfx906) from the list of devices to compile for. 'all' resets the list to its default value.
--no-offload-new-driver Don't Use the new driver for offloading compilation.
--no-system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as not including a system header.
-nobuiltininc Disable builtin #include directories
-nogpuinc Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers
-nogpulib Do not link device library for CUDA/HIP device compilation
-nohipwrapperinc Do not include the default HIP wrapper headers and include paths
-nostdinc++ Disable standard #include directories for the C++ standard library
--nvptx-arch-tool=<value>
Tool used for detecting NVIDIA GPU arch in the system.
-ObjC++ Treat source input files as Objective-C++ inputs
-objcmt-allowlist-dir-path=<value>
Only modify files with a filename contained in the provided directory path
-objcmt-atomic-property Make migration to 'atomic' properties
-objcmt-migrate-all Enable migration to modern ObjC
-objcmt-migrate-annotation
Enable migration to property and method annotations
-objcmt-migrate-designated-init
Enable migration to infer NS_DESIGNATED_INITIALIZER for initializer methods
-objcmt-migrate-instancetype
Enable migration to infer instancetype for method result type
-objcmt-migrate-literals
Enable migration to modern ObjC literals
-objcmt-migrate-ns-macros
Enable migration to NS_ENUM/NS_OPTIONS macros
-objcmt-migrate-property-dot-syntax
Enable migration of setter/getter messages to property-dot syntax
-objcmt-migrate-property
Enable migration to modern ObjC property
-objcmt-migrate-protocol-conformance
Enable migration to add protocol conformance on classes
-objcmt-migrate-readonly-property
Enable migration to modern ObjC readonly property
-objcmt-migrate-readwrite-property
Enable migration to modern ObjC readwrite property
-objcmt-migrate-subscripting
Enable migration to modern ObjC subscripting
-objcmt-ns-nonatomic-iosonly
Enable migration to use NS_NONATOMIC_IOSONLY macro for setting property's 'atomic' attribute
-objcmt-returns-innerpointer-property
Enable migration to annotate property with NS_RETURNS_INNER_POINTER
-objcmt-whitelist-dir-path=<value>
Alias for -objcmt-allowlist-dir-path
-ObjC Treat source input files as Objective-C inputs
-object-file-name=<file>
Set the output <file> for debug infos
--offload-arch=<value> Specify an offloading device architecture for CUDA, HIP, or OpenMP. (e.g. sm_35). If 'native' is used the compiler will detect locally installed architectures. For HIP offloading, the device architecture can be followed by target ID features delimited by a colon (e.g. gfx908:xnack+:sramecc-). May be specified more than once.
--offload-compress Compress offload device binaries (HIP only)
--offload-device-only Only compile for the offloading device.
--offload-host-device Compile for both the offloading host and device (default).
--offload-host-only Only compile for the offloading host.
--offload-link Use the new offloading linker to perform the link job.
--offload-new-driver Use the new driver for offloading compilation.
--offload=<value> Specify comma-separated list of offloading target triples (CUDA and HIP only)
-o <file> Write output to <file>
-pedantic Warn on language extensions
-pg Enable mcount instrumentation
-pipe Use pipes between commands, when possible
--precompile Only precompile the input
--pretty-sgf Emit pretty printed symbol graphs
-print-diagnostic-options
Print all of Clang's warning options
-print-effective-triple Print the effective target triple
-print-file-name=<file> Print the full library path of <file>
-print-ivar-layout Enable Objective-C Ivar layout bitmap print trace
-print-libgcc-file-name Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang_rt.builtins.*.a")
-print-library-module-manifest-path
Print the path for the C++ Standard library module manifest
-print-multi-flags-experimental
Print the flags used for selecting multilibs (experimental)
-print-prog-name=<name> Print the full program path of <name>
-print-resource-dir Print the resource directory pathname
-print-rocm-search-dirs Print the paths used for finding ROCm installation
-print-runtime-dir Print the directory pathname containing Clang's runtime libraries
-print-search-dirs Print the paths used for finding libraries and programs
-print-supported-cpus Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target)
-print-supported-extensions
Print supported -march extensions (RISC-V, AArch64 and ARM only)
-print-target-triple Print the normalized target triple
-print-targets Print the registered targets
-pthread Support POSIX threads in generated code
--ptxas-path=<value> Path to ptxas (used for compiling CUDA code)
-P Disable linemarker output in -E mode
-p Enable mcount instrumentation with prof
-Qn Do not emit metadata containing compiler name and version
-Qunused-arguments Don't emit warning for unused driver arguments
-Qy Emit metadata containing compiler name and version
-regcall4 Set __regcall4 as a default calling convention to respect __regcall ABI v.4
-relocatable-pch Whether to build a relocatable precompiled header
-rewrite-legacy-objc Rewrite Legacy Objective-C source to C++
-rewrite-objc Rewrite Objective-C source to C++
--rocm-device-lib-path=<value>
ROCm device library path. Alternative to rocm-path.
--rocm-path=<value> ROCm installation path, used for finding and automatically linking required bitcode libraries.
-Rpass-analysis=<value> Report transformation analysis from optimization passes whose name matches the given POSIX regular expression
-Rpass-missed=<value> Report missed transformations by optimization passes whose name matches the given POSIX regular expression
-Rpass=<value> Report transformations performed by optimization passes whose name matches the given POSIX regular expression
-rtlib=<value> Compiler runtime library to use
-R<remark> Enable the specified remark
-save-stats=<value> Save llvm statistics.
-save-stats Save llvm statistics.
-save-temps=<value> Save intermediate compilation results. <arg> can be set to 'cwd' for current working directory, or 'obj' which will save temporary files in the same directory as the final output file
-save-temps Alias for --save-temps=cwd
-serialize-diagnostics <value>
Serialize compiler diagnostics to a file
-shared-libsan Dynamically link the sanitizer runtime
--start-no-unused-arguments
Don't emit warnings about unused arguments for the following arguments
-static-libsan Statically link the sanitizer runtime (Not supported for ASan, TSan or UBSan on darwin)
-static-openmp Use the static host OpenMP runtime while linking.
-std=<value> Language standard to compile for
-stdlib++-isystem <directory>
Use directory as the C++ standard library include path
-stdlib=<value> C++ standard library to use
-sycl-std=<value> SYCL language standard to compile for.
--symbol-graph-dir=<value>
Directory in which to emit symbol graphs.
--system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as including a system header.
-S Only run preprocess and compilation steps
--target=<value> Generate code for the given target
-time Time individual commands
-traditional-cpp Enable some traditional CPP emulation
-trigraphs Process trigraph sequences
-T <script> Specify <script> as linker script
-undef undef all system defines
-unwindlib=<value> Unwind library to use
-U <macro> Undefine macro <macro>
--verify-debug-info Verify the binary representation of debug output
-verify-pch Load and verify that a pre-compiled header file is not stale
--version Print version information
-vfsoverlay <value> Overlay the virtual filesystem described by file over the real file system. Additionally, pass this overlay file to the linker if it supports it
-v Show commands to run and use verbose output
-Wa,<arg> Pass the comma separated arguments in <arg> to the assembler
-Wdeprecated Enable warnings for deprecated constructs and define __DEPRECATED
-Wl,<arg> Pass the comma separated arguments in <arg> to the linker
-working-directory <value>
Resolve file paths relative to the specified directory
-Wp,<arg> Pass the comma separated arguments in <arg> to the preprocessor
-W<warning> Enable the specified warning
-w Suppress all warnings
-Xanalyzer <arg> Pass <arg> to the static analyzer
-Xarch_device <arg> Pass <arg> to the CUDA/HIP device compilation
-Xarch_host <arg> Pass <arg> to the CUDA/HIP host compilation
-Xassembler <arg> Pass <arg> to the assembler
-Xclang=<arg> Alias for -Xclang
-Xclang <arg> Pass <arg> to clang -cc1
-Xcuda-fatbinary <arg> Pass <arg> to fatbinary invocation
-Xcuda-ptxas <arg> Pass <arg> to the ptxas assembler
-Xlinker <arg> Pass <arg> to the linker
-Xoffload-linker<triple> <arg>
Pass <arg> to the offload linkers or the ones idenfied by -<triple>
-Xopenmp-target=<triple> <arg>
Pass <arg> to the target offloading toolchain identified by <triple>.
-Xopenmp-target <arg> Pass <arg> to the target offloading toolchain.
-Xpreprocessor <arg> Pass <arg> to the preprocessor
-x <language> Treat subsequent input files as having type <language>
-z <arg> Pass -z <arg> to the linker
dxc compatibility options.:
--dxv-path=<value> DXIL validator installation path
-fspv-target-env=<value>
Specify the target environment
-hlsl-entry <value> Entry point name for hlsl
-print-supported-cpus, --print-supported-cpus, -mcpu=help, -mtune=help
Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target)
$ clang --print-supported-cpus
Ubuntu clang version 19.0.0 (++20240421052952+48324f0f7b26-1~exp1~20240421173100.1000)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
Available CPUs for this target:
alderlake
amdfam10
arrowlake
arrowlake-s
arrowlake_s
athlon
athlon-4
athlon-fx
athlon-mp
athlon-tbird
athlon-xp
athlon64
athlon64-sse3
atom
atom_sse4_2
atom_sse4_2_movbe
barcelona
bdver1
bdver2
bdver3
bdver4
bonnell
broadwell
btver1
btver2
c3
c3-2
cannonlake
cascadelake
clearwaterforest
cooperlake
core-avx-i
core-avx2
core2
core_2_duo_sse4_1
core_2_duo_ssse3
core_2nd_gen_avx
core_3rd_gen_avx
core_4th_gen_avx
core_4th_gen_avx_tsx
core_5th_gen_avx
core_5th_gen_avx_tsx
core_aes_pclmulqdq
core_i7_sse4_2
corei7
corei7-avx
emeraldrapids
generic
geode
goldmont
goldmont-plus
goldmont_plus
gracemont
grandridge
graniterapids
graniterapids-d
graniterapids_d
haswell
i386
i486
i586
i686
icelake-client
icelake-server
icelake_client
icelake_server
ivybridge
k6
k6-2
k6-3
k8
k8-sse3
knl
knm
lakemont
lunarlake
meteorlake
mic_avx512
nehalem
nocona
opteron
opteron-sse3
pantherlake
penryn
pentium
pentium-m
pentium-mmx
pentium2
pentium3
pentium3m
pentium4
pentium4m
pentium_4
pentium_4_sse3
pentium_ii
pentium_iii
pentium_iii_no_xmm_regs
pentium_m
pentium_mmx
pentium_pro
pentiumpro
prescott
raptorlake
rocketlake
sandybridge
sapphirerapids
sierraforest
silvermont
skx
skylake
skylake-avx512
skylake_avx512
slm
tigerlake
tremont
westmere
winchip-c6
winchip2
x86-64
x86-64-v2
x86-64-v3
x86-64-v4
yonah
znver1
znver2
znver3
znver4
Use -mcpu or -mtune to specify the target's processor.
For example, clang --target=aarch64-unknown-linux-gnu -mcpu=cortex-a35$ clang --print-targets
Registered Targets:
aarch64 - AArch64 (little endian)
aarch64_32 - AArch64 (little endian ILP32)
aarch64_be - AArch64 (big endian)
amdgcn - AMD GCN GPUs
arm - ARM
arm64 - ARM64 (little endian)
arm64_32 - ARM64 (little endian ILP32)
armeb - ARM (big endian)
avr - Atmel AVR Microcontroller
bpf - BPF (host endian)
bpfeb - BPF (big endian)
bpfel - BPF (little endian)
hexagon - Hexagon
lanai - Lanai
loongarch32 - 32-bit LoongArch
loongarch64 - 64-bit LoongArch
m68k - Motorola 68000 family
mips - MIPS (32-bit big endian)
mips64 - MIPS (64-bit big endian)
mips64el - MIPS (64-bit little endian)
mipsel - MIPS (32-bit little endian)
msp430 - MSP430 [experimental]
nvptx - NVIDIA PTX 32-bit
nvptx64 - NVIDIA PTX 64-bit
ppc32 - PowerPC 32
ppc32le - PowerPC 32 LE
ppc64 - PowerPC 64
ppc64le - PowerPC 64 LE
r600 - AMD GPUs HD2XXX-HD6XXX
riscv32 - 32-bit RISC-V
riscv64 - 64-bit RISC-V
sparc - Sparc
sparcel - Sparc LE
sparcv9 - Sparc V9
systemz - SystemZ
thumb - Thumb
thumbeb - Thumb (big endian)
ve - VE
wasm32 - WebAssembly 32-bit
wasm64 - WebAssembly 64-bit
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
xcore - XCore
xtensa - Xtensa 32Created and designed by Lanka Hsu.
HelperX is available under the BSD-3-Clause license. See the LICENSE file for more info.