diff options
author | Rahul Butani <rrbutani@users.noreply.github.com> | 2023-04-12 14:51:11 -0500 |
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committer | Someone Serge <sergei.kozlukov@aalto.fi> | 2024-01-12 17:38:00 +0000 |
commit | 290ea23649ef663eab7de48992de87c647316044 (patch) | |
tree | a26f5c9ffed8fce4296f0421df5802f12012f902 /pkgs/build-support/cc-wrapper | |
parent | 223283c66b431a937dc41c760f08067336c9c113 (diff) |
cc-wrapper: expose the c++ std library being used
(cherry picked from commit dc6a8f9f7912363577e11520bafa040c0db14359)
Diffstat (limited to 'pkgs/build-support/cc-wrapper')
-rw-r--r-- | pkgs/build-support/cc-wrapper/default.nix | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix index 56075a032971c..e07d465646543 100644 --- a/pkgs/build-support/cc-wrapper/default.nix +++ b/pkgs/build-support/cc-wrapper/default.nix @@ -261,6 +261,25 @@ stdenv.mkDerivation { inherit bintools; inherit cc libc libcxx nativeTools nativeLibc nativePrefix isGNU isClang; + # Expose the C++ standard library we're using. See the comments on "General + # libc++ support". This is also relevant when using older gcc than the + # stdenv's, as may be required e.g. by CUDAToolkit's nvcc. + cxxStdlib = + let + givenLibcxx = libcxx.isLLVM or false; + givenGccForLibs = useGccForLibs && gccForLibs.langCC or false; + in + if (!givenLibcxx) && givenGccForLibs then + { kind = "libstdc++"; lib = gccForLibs; } + else if givenLibcxx then + { kind = "libc++"; lib = libcxx; } + else + # We're probably using the `libstdc++` that came with our `gcc`. + # TODO: this is maybe not always correct? + # TODO: what happens when `nativeTools = true`? + { kind = "libstdc++"; lib = cc_solib; } + ; + emacsBufferSetup = pkgs: '' ; We should handle propagation here too (mapc @@ -440,6 +459,13 @@ stdenv.mkDerivation { echo "-L${gccForLibs}/lib/gcc/${targetPlatform.config}/${gccForLibs.version}" >> $out/nix-support/cc-ldflags echo "-L${gccForLibs_solib}/lib" >> $out/nix-support/cc-ldflags '' + # The above "fix" may be incorrect; gcc.cc.lib doesn't contain a + # `target-triple` dir but the correct fix may be to just remove the above? + # + # For clang it's not necessary (see `--gcc-toolchain` below) and for other + # situations adding in the above will bring in lots of other gcc libraries + # (i.e. sanitizer libraries, `libatomic`, `libquadmath`) besides just + # `libstdc++`; this may actually break clang. # TODO We would like to connect this to `useGccForLibs`, but we cannot yet # because `libcxxStdenv` on linux still needs this. Maybe someday we'll |