Sergei Trofimovich 2c931bd5f4 gcc: provide both native and cross forms of gcc.libs libraries ... I would like to use --sysroot=/nix/store/does/not/exist hack for both `gcc` and `clang` drivers to remove default include (and library) search paths when we override them with libc. For `gcc` it works as is. But for `clang` it also drops some of `gcc` search paths`. Let'sconsider 2 lookups. Successful lookup (no `--sysroot`): $ printf "int main(){}" | clang++ -x c++ - -Wl,--verbose |& grep -F stdc++ attempt to open /nix/store/...-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/libstdc++.so failed attempt to open /nix/store/...-gcc-11.3.0-lib/x86_64-unknown-linux-gnu/lib/libstdc++.so failed attempt to open /nix/store/...-clang-11.1.0-lib/lib/libstdc++.so failed attempt to open /nix/store/...-gcc-11.3.0/lib64/gcc/x86_64-unknown-linux-gnu/11.3.0/libstdc++.so failed attempt to open /nix/store/...-gcc-11.3.0/lib64/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../lib64/libstdc++.so failed /nix/store/...-gcc-11.3.0/lib64/gcc/x86_64-unknown-linux-gnu/11.3.0/../../../../lib64/libstdc++.a Failed lookup (has `--sysroot`): $ printf "int main(){}" | clang++ --sysroot=/does/not/exist -x c++ - -Wl,--verbose |& grep -F stdc++ attempt to open /nix/store/...-gcc-11.3.0/lib/gcc/x86_64-unknown-linux-gnu/11.3.0/libstdc++.so failed attempt to open /nix/store/...-gcc-11.3.0-lib/x86_64-unknown-linux-gnu/lib/libstdc++.so failed attempt to open /nix/store/...-clang-11.1.0-lib/lib/libstdc++.so failed attempt to open /nix/store/...-gcc-11.3.0/lib64/gcc/x86_64-unknown-linux-gnu/11.3.0/libstdc++.so failed /nix/store/...-binutils-2.39/bin/ld: cannot find -lstdc++: No such file or directory Note how `clang` starts the search roughly from `gcc-11.3.0-lib/x86_64-unknown-linux-gnu/lib` in both cases. I think it's our preferred location for both native and cross cases. The change adds such a symlink: `gcc-11.3.0-lib` -> `gcc-11.3.0-lib/x86_64-unknown-linux-gnu`		2023-01-05 14:41:35 +00:00
..
Added-mcf-thread-model-support-from-mcfgthread.patch
avoid-cycling-subreg-reloads.patch
default.nix	gcc: provide both native and cross forms of gcc.libs libraries	2023-01-05 14:41:35 +00:00
gcc9-asan-glibc-2.34.patch