Commits on Jan 5, 2023

1. 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`

   

   trofi committed Jan 5, 2023
   Configuration menu

   • View commit details
   • Copy full SHA for 2c931bd
   • Browse repository at this point

   Copy the full SHA

   2c931bd View commit details

   Browse the repository at this point in the history