build-support/cc-wrapper: add libstdc++fs into default library path for clang
After https://github.com/NixOS/nixpkgs/pull/210004 `usbmuxd2` started failing to build as: usbmuxd2-unstable> .../ld: cannot find -lstdc++fs: No such file or directory usbmuxd2-unstable> clang-11: error: linker command failed with exit code 1 (use -v to see invocation) This started happening because #210004 exposed a long-standing bug in `gcc` derivation: `cc.lib` is missing `libstdc++fs` library: $ find $(nix-build --no-link -A stdenv.cc.cc.lib) | fgrep libstdc | unnix /<<NIX>>/gcc-11.3.0-lib/lib/libstdc++fs.la /<<NIX>>/gcc-11.3.0-lib/lib/libstdc++.la /<<NIX>>/gcc-11.3.0-lib/lib/libstdc++.so.6.0.29 /<<NIX>>/gcc-11.3.0-lib/lib/libstdc++.so /<<NIX>>/gcc-11.3.0-lib/lib/libstdc++.so.6 It was not moved from `cc.out` output: $ find $(nix-build --no-link -A stdenv.cc.cc) | fgrep libstdc | unnix /<<NIX>>/gcc-11.3.0/lib/libstdc++.a /<<NIX>>/gcc-11.3.0/lib/libstdc++fs.a This change adds `cc` library lookup path back to `staging-next` until `gcc` is fixed.`
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@ -321,6 +321,11 @@ stdenv.mkDerivation {
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&& !(stdenv.targetPlatform.useLLVM or false)
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&& gccForLibs != null) ''
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echo "--gcc-toolchain=${gccForLibs}" >> $out/nix-support/cc-cflags
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# Pull in 'cc.out' target to get 'libstdc++fs.a'. It should be in
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# 'cc.lib'. But it's a gcc package bug.
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# TODO(trofi): remove once gcc is fixed to move libraries to .lib output.
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echo "-L${gccForLibs}/${optionalString (targetPlatform != hostPlatform) "/${targetPlatform.config}"}/lib" >> $out/nix-support/cc-ldflags
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''
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##
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