On 19 June 2017 18:05:36 BST, Bas van Dijk <v.dijk....@gmail.com> wrote: >Thanks Vincent, you are spot on! > >I went with the following change: > >https://github.com/LumiGuide/haskell-opencv/commit/6b78bc4c431d693b0bc828cc86708882a26f777c > >Bas > >On 19 June 2017 at 17:00, Vincent Laporte <vincent.lapo...@gmail.com> >wrote: > >> Hi, >> >> Notice that if you replace the two occurrences of ‘g++’ by ‘clang++’ >in >> the file ‘opencv/Setup.hs’, then ‘nix-build’ succeeds. >> >> This issue might be reported upstream: they apparently need a >configure >> step to select the correct name of the C++ compiler. >> >> The following patch also appears to make ‘nix-build’ work. >> >> Regards, >> -- >> Vincent. >> >> ``` >> diff --git a/opencv/Setup.hs b/opencv/Setup.hs >> index 031daa1..3c92176 100644 >> --- a/opencv/Setup.hs >> +++ b/opencv/Setup.hs >> @@ -3,6 +3,6 @@ import System.Environment ( getArgs ) >> >> main = do >> args <- getArgs >> - let args' | "configure" `elem` args = args ++ >["--with-gcc","g++", >> "--with-ld","g++"] >> + let args' | "configure" `elem` args = args >> | otherwise = args >> defaultMainArgs args' >> diff --git a/opencv/opencv.nix b/opencv/opencv.nix >> index a28674c..80ed995 100644 >> --- a/opencv/opencv.nix >> +++ b/opencv/opencv.nix >> @@ -103,8 +103,8 @@ mkDerivation ({ >> libraryPkgconfigDepends = [ opencv3 ]; >> >> configureFlags = >> - [ "--with-gcc=g++" >> - "--with-ld=g++" >> + [ "--with-gcc=${stdenv.cc}/bin/c++" >> + "--with-ld=${stdenv.cc}/bin/c++" >> ]; >> >> hardeningDisable = [ "bindnow" ]; >> ``` >> _______________________________________________ >> nix-dev mailing list >> nix-dev@lists.science.uu.nl >> https://mailman.science.uu.nl/mailman/listinfo/nix-dev >>
I believe stdenv also sets the CC and CXX environment variables to the preferred C compiler, which could be useful to avoid additional nix code. Linus _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl https://mailman.science.uu.nl/mailman/listinfo/nix-dev