CMakeLists.txt

project(halo)
cmake_minimum_required(VERSION 3.16)

find_package(Python3 COMPONENTS Interpreter)

set(gen_dir "${PROJECT_BINARY_DIR}/generated")
add_custom_target(create_gen_dir ALL
	COMMAND ${CMAKE_COMMAND} -E make_directory ${gen_dir})

add_custom_command(
	OUTPUT "${gen_dir}/decl.h" "${gen_dir}/halo.xbe.def" "${gen_dir}/thunks.c"
	COMMAND "${Python3_EXECUTABLE}" "${CMAKE_CURRENT_LIST_DIR}/tools/knowledge.py"
		--gen-header "${gen_dir}/decl.h"
		--gen-def "${gen_dir}/halo.xbe.def"
		--gen-thunks "${gen_dir}/thunks.c"
	DEPENDS "${CMAKE_CURRENT_LIST_DIR}/tools/knowledge.py" "${CMAKE_CURRENT_LIST_DIR}/kb.json" create_gen_dir
	VERBATIM
)

if(MSVC)
	set(lib_tool "lib")
else()
	set(lib_tool "lld-link")
endif()

add_custom_command(
	OUTPUT "${gen_dir}/halo.xbe.lib"
	COMMAND ${lib_tool} /def:${gen_dir}/halo.xbe.def /machine:x86 /out:${gen_dir}/halo.xbe.lib
	DEPENDS "${gen_dir}/halo.xbe.def" create_gen_dir
	VERBATIM
)

add_custom_command(
	OUTPUT "${gen_dir}/xboxkrnl.exe.lib"
	COMMAND ${lib_tool} /def:${CMAKE_SOURCE_DIR}/src/xboxkrnl.exe.def /machine:x86 /out:${gen_dir}/xboxkrnl.exe.lib
	DEPENDS "${CMAKE_SOURCE_DIR}/src/xboxkrnl.exe.def" create_gen_dir
	VERBATIM
)

add_custom_command(
	OUTPUT "${gen_dir}/build_info.c" "${gen_dir}/.force"
	COMMAND "${Python3_EXECUTABLE}" "${CMAKE_CURRENT_LIST_DIR}/tools/gen-build-info.py" > ${gen_dir}/build_info.c
	DEPENDS "${CMAKE_CURRENT_LIST_DIR}/tools/gen-build-info.py" create_gen_dir
	VERBATIM
)

add_custom_command(
	OUTPUT "${gen_dir}/typechecks.c"
	COMMAND "${Python3_EXECUTABLE}" "${CMAKE_CURRENT_LIST_DIR}/tools/gen-struct-checks.py" "${CMAKE_SOURCE_DIR}/src/types.h" > "${gen_dir}/typechecks.c"
	DEPENDS "${CMAKE_CURRENT_LIST_DIR}/tools/gen-struct-checks.py" "${CMAKE_SOURCE_DIR}/src/types.h" create_gen_dir
	VERBATIM
)

include_directories(${gen_dir} ${CMAKE_SOURCE_DIR}/src)

if(CMAKE_BUILD_TYPE STREQUAL "")
	set(CMAKE_BUILD_TYPE "Release")
endif()

if(MSVC)
	if(CMAKE_SIZEOF_VOID_P EQUAL 8)
		message(FATAL_ERROR "You are attempting to build for x86-64 (64-bit). Delete the build directory, then specify -AWin32 when configuring with CMake to build for x86 (32-bit).")
	endif()
	set(CMAKE_C_FLAGS "/FI\"${CMAKE_SOURCE_DIR}/src/common.h\" /GS- /DMSVC")
	set(CMAKE_EXE_LINKER_FLAGS "/entry:_start /nodefaultlib:msvcrtd.lib /nodefaultlib:msvcrt.lib /incremental:no")
else()
	if(NOT CMAKE_C_COMPILER_ID STREQUAL "Clang")
		# FIXME: We can support other toolchains, but currently do not
		message(FATAL_ERROR "You are attempting to compile with ${CMAKE_CXX_COMPILER_ID}. Please use LLVM toolchain (clang, lld). Specify -DCMAKE_TOOLCHAIN_FILE=toolchains/llvm.cmake during configuration.")
	endif()
	set(CMAKE_C_FLAGS "-Wall -Werror -target i386-pc-win32 -march=pentium3 -nostdlib -ffreestanding -fno-builtin -fno-exceptions -I${CMAKE_SOURCE_DIR}/src -include ${CMAKE_SOURCE_DIR}/src/common.h")
	set(CMAKE_EXE_LINKER_FLAGS "-fuse-ld=lld-link -Xlinker -entry:_start")

	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Og -gdwarf-4")
		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Xlinker -debug")
	endif()
endif()

add_executable(halo)

add_subdirectory(src)
target_sources(halo PRIVATE
	${gen_dir}/thunks.c
	${gen_dir}/build_info.c
	${gen_dir}/typechecks.c
	)

set(import_libs ${gen_dir}/halo.xbe.lib ${gen_dir}/xboxkrnl.exe.lib)
target_link_libraries(halo ${import_libs})
add_custom_target(import_libs_target DEPENDS ${import_libs})
add_dependencies(halo import_libs_target)

add_custom_target(
	patched_xbe ALL
	DEPENDS "$<TARGET_FILE:halo>" "${CMAKE_CURRENT_LIST_DIR}/tools/patch.py"
	BYPRODUCTS ${CMAKE_CURRENT_LIST_DIR}/halo-patched/default.xbe
	COMMAND
		"${Python3_EXECUTABLE}" "${CMAKE_CURRENT_LIST_DIR}/tools/patch.py"
			"${CMAKE_CURRENT_LIST_DIR}/halo-patched/cachebeta.xbe"
			"$<TARGET_FILE:halo>"
			"${CMAKE_CURRENT_LIST_DIR}/halo-patched/default.xbe"
	VERBATIM
	)