CODEWITHSUNDEEP
c++gccstlg++clang
Castaa
Castaa

Reputation: 185

Easiest method to configure clang++ to use g++/gcc STL headers in Cygwin?

I'm running the most up to date versions of clang++ (v3.1) and g++/gcc (v4.7.3) in Cygwin (32-bit). Everything is using the installed default configuration. This is a fresh install of Cygwin in Windows 8.

My issue is that clang++ cannot find the installed g++ STL headers to compile my project.

    #include <stdlib.h>
    #include <mutex>
    #include <thread>

    int main() {
        std::mutex myMutext;
        return 0;
    }

This sample code results in this error when compiled. Notice the libc stdlib.h header compiles without error. It's that isn't found. I've tried other STL headers as a test, same error.

clang++ -c -o test.o test.cpp

    test.cpp:2:10: fatal error: 'mutex' file not found
    #include <mutex>
              ^
    1 error generated.

After some searching it seems the suggested options are recompiling the entire clang project and adding the header paths to its source or manually adding all the g++ STL header paths to my makefile both of which seem kind of hacky.

There has to be an easier option, right?

Upvotes: 3

Views: 4511

Answers (2)

Holmes Conan
Holmes Conan

Reputation: 1241

I don't know if you have solve it, but I have a simpler solution: just make s symlink of 4.7.3 to 4.5.3 and compile your code with -lstdc++ option, all will done.

Upvotes: 3

nmaier
nmaier

Reputation: 33212

clang++ will be build (compile-time) against specific versions of libstdc++ by default (IIRC). It will not check the system for newer versions at runtime.

The libstdc++ the clang-3.1 package of cygwin seems to use is gcc-4.5.3, as indicated by the output of clang++ -v test.cc. gcc-4.5.3 is not installed in your enviroment, however.

Your options, none of which are great:

  • Downgrade gcc to 4.5.3 via the setup. However your C++11 code will still not compile, due to lack of support in the libstc++ that comes with gcc-4.5.3.
  • Build clang yourself, against the newer gcc.
  • Build clang yourself, with libc++. However, it is highly unlikely Windows is (fully) supported by it.
  • Use gcc-4.7 instead. The Windows support is far more mature in gcc right now anyway (and don't get me started about cross-compilers).

(Aside: you'll need -std=c++11 to compile your code)

Upvotes: 1

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