static-link feature doesn't seem to do anything without also specifying bundled (Linux)

[valderman]

When #1195 prevented me from building my small image-using project with the bundled feature, I tried to link statically against the system libraries instead. Unfortunately, everything gets dynamically linked, as if static-link was never specified.

Using the following config:

[dependencies.sdl2]
version = "~0.35"
default-features = false
features = ["static-link", "use-pkgconfig", "image"]

The expected result is a binary with ~5 dependencies, which is what I get if I replace use-pkgconfig with bundled and commend out any use of the image feature.

However, running ldd on the binary built with the config shown above results in the following monstrosity:

	linux-vdso.so.1 (0x00007ffffa9ee000)
	libSDL2_image-2.0.so.0 => /lib/x86_64-linux-gnu/libSDL2_image-2.0.so.0 (0x00007f7fb3e03000)
	libSDL2-2.0.so.0 => /lib/x86_64-linux-gnu/libSDL2-2.0.so.0 (0x00007f7fb3c64000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7fb3c5d000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f7fb3c3c000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f7fb3c22000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7fb3a57000)
	libpng16.so.16 => /lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f7fb3a1d000)
	libjpeg.so.62 => /lib/x86_64-linux-gnu/libjpeg.so.62 (0x00007f7fb3999000)
	libtiff.so.5 => /lib/x86_64-linux-gnu/libtiff.so.5 (0x00007f7fb3912000)
	libwebp.so.6 => /lib/x86_64-linux-gnu/libwebp.so.6 (0x00007f7fb38a9000)
	libasound.so.2 => /lib/x86_64-linux-gnu/libasound.so.2 (0x00007f7fb37a2000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f7fb365d000)
	libpulse.so.0 => /lib/x86_64-linux-gnu/libpulse.so.0 (0x00007f7fb3608000)
	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f7fb34c5000)
	libXext.so.6 => /lib/x86_64-linux-gnu/libXext.so.6 (0x00007f7fb34b0000)
	libXcursor.so.1 => /lib/x86_64-linux-gnu/libXcursor.so.1 (0x00007f7fb34a3000)
	libXinerama.so.1 => /lib/x86_64-linux-gnu/libXinerama.so.1 (0x00007f7fb349e000)
	libXi.so.6 => /lib/x86_64-linux-gnu/libXi.so.6 (0x00007f7fb3488000)
	libXfixes.so.3 => /lib/x86_64-linux-gnu/libXfixes.so.3 (0x00007f7fb3480000)
	libXrandr.so.2 => /lib/x86_64-linux-gnu/libXrandr.so.2 (0x00007f7fb3473000)
	libXss.so.1 => /lib/x86_64-linux-gnu/libXss.so.1 (0x00007f7fb346e000)
	libXxf86vm.so.1 => /lib/x86_64-linux-gnu/libXxf86vm.so.1 (0x00007f7fb3268000)
	libdrm.so.2 => /lib/x86_64-linux-gnu/libdrm.so.2 (0x00007f7fb3253000)
	libgbm.so.1 => /lib/x86_64-linux-gnu/libgbm.so.1 (0x00007f7fb3241000)
	libwayland-egl.so.1 => /lib/x86_64-linux-gnu/libwayland-egl.so.1 (0x00007f7fb323c000)
	libwayland-client.so.0 => /lib/x86_64-linux-gnu/libwayland-client.so.0 (0x00007f7fb322b000)
	libwayland-cursor.so.0 => /lib/x86_64-linux-gnu/libwayland-cursor.so.0 (0x00007f7fb3222000)
	libxkbcommon.so.0 => /lib/x86_64-linux-gnu/libxkbcommon.so.0 (0x00007f7fb31dc000)
	libdecor-0.so.0 => /lib/x86_64-linux-gnu/libdecor-0.so.0 (0x00007f7fb31d1000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f7fb3e8a000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f7fb31b2000)
	libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007f7fb30d7000)
	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007f7fb30af000)
	libjbig.so.0 => /lib/x86_64-linux-gnu/libjbig.so.0 (0x00007f7fb2ea1000)
	libdeflate.so.0 => /lib/x86_64-linux-gnu/libdeflate.so.0 (0x00007f7fb2e85000)
	libpulsecommon-15.0.so => /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-15.0.so (0x00007f7fb2dfa000)
	libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 (0x00007f7fb2da6000)
	libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f7fb2d7b000)
	libXrender.so.1 => /lib/x86_64-linux-gnu/libXrender.so.1 (0x00007f7fb2b71000)
	libwayland-server.so.0 => /lib/x86_64-linux-gnu/libwayland-server.so.0 (0x00007f7fb2b5a000)
	libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f7fb2b28000)
	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f7fb291c000)
	libffi.so.8 => /lib/x86_64-linux-gnu/libffi.so.8 (0x00007f7fb290f000)
	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f7fb2904000)
	libsndfile.so.1 => /lib/x86_64-linux-gnu/libsndfile.so.1 (0x00007f7fb2881000)
	libX11-xcb.so.1 => /lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f7fb287a000)
	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007f7fb279b000)
	libasyncns.so.0 => /lib/x86_64-linux-gnu/libasyncns.so.0 (0x00007f7fb2793000)
	libwrap.so.0 => /lib/x86_64-linux-gnu/libwrap.so.0 (0x00007f7fb2787000)
	libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f7fb2782000)
	libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f7fb257c000)
	libFLAC.so.8 => /lib/x86_64-linux-gnu/libFLAC.so.8 (0x00007f7fb253b000)
	libvorbis.so.0 => /lib/x86_64-linux-gnu/libvorbis.so.0 (0x00007f7fb250e000)
	libvorbisenc.so.2 => /lib/x86_64-linux-gnu/libvorbisenc.so.2 (0x00007f7fb2463000)
	libopus.so.0 => /lib/x86_64-linux-gnu/libopus.so.0 (0x00007f7fb2408000)
	libogg.so.0 => /lib/x86_64-linux-gnu/libogg.so.0 (0x00007f7fb23fb000)
	liblz4.so.1 => /lib/x86_64-linux-gnu/liblz4.so.1 (0x00007f7fb23d6000)
	libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007f7fb23cb000)
	libgcrypt.so.20 => /lib/x86_64-linux-gnu/libgcrypt.so.20 (0x00007f7fb2290000)
	libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007f7fb2276000)
	libnsl.so.2 => /lib/x86_64-linux-gnu/libnsl.so.2 (0x00007f7fb225b000)
	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f7fb2244000)
	libgpg-error.so.0 => /lib/x86_64-linux-gnu/libgpg-error.so.0 (0x00007f7fb221b000)
	libtirpc.so.3 => /lib/x86_64-linux-gnu/libtirpc.so.3 (0x00007f7fb21ec000)
	libmd.so.0 => /lib/x86_64-linux-gnu/libmd.so.0 (0x00007f7fb21df000)
	libgssapi_krb5.so.2 => /lib/x86_64-linux-gnu/libgssapi_krb5.so.2 (0x00007f7fb218c000)
	libkrb5.so.3 => /lib/x86_64-linux-gnu/libkrb5.so.3 (0x00007f7fb20b2000)
	libk5crypto.so.3 => /lib/x86_64-linux-gnu/libk5crypto.so.3 (0x00007f7fb2080000)
	libcom_err.so.2 => /lib/x86_64-linux-gnu/libcom_err.so.2 (0x00007f7fb207a000)
	libkrb5support.so.0 => /lib/x86_64-linux-gnu/libkrb5support.so.0 (0x00007f7fb206b000)
	libkeyutils.so.1 => /lib/x86_64-linux-gnu/libkeyutils.so.1 (0x00007f7fb2064000)

[Cobrand]

This seems to be a regression, I have no idea from when though.

Even without image simply using cargo build --example demo --features use-pkgconfig,static-link links SDL2 dynamically, which is not the behavior expected:

ldd target/debug/examples/demo
	linux-vdso.so.1 (0x00007ffd653c4000)
	libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f132db63000)
	libSDL2-2.0.so.0 => /usr/lib/libSDL2-2.0.so.0 (0x00007f132d9bf000)
	libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f132d9a4000)
	libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f132d983000)
	libc.so.6 => /usr/lib/libc.so.6 (0x00007f132d7b7000)
	/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007f132dc09000)
	libm.so.6 => /usr/lib/libm.so.6 (0x00007f132d673000)

[Cobrand]

It seems to be an upstream issue from pkg-config: rust-lang/pkg-config-rs#102 (comment)

[nistvan86]

I wonder if we could use sdl2-config --cflags --static-libs instead of pkg-config to figure out library dependencies in such case?