[cfe-dev] [libc++] Compiling with MinGW-w64

[Mateusz Mikuła via cfe-dev]

Hello,

I'm planing to get libc++ compiling with MinGW-w64, right now without
patches it fails with:

    CMake Error at projects/libcxx/CMakeLists.txt:396 (message):
      C++11 or greater is required but the compiler does not support c++11

It is caused by adding `-nodefaultlibs` flag (it passes it's own check
[1]
<https://github.com/llvm-mirror/libcxx/blob/master/cmake/config-ix.cmake#L27>).
However many following checks fail due to undefined references, results
with gcc [2] <https://reviews.llvm.org/P7975> and clang [3]
<https://reviews.llvm.org/P7976>.

Hard-coding 0 for LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG allows it go finish
configuration and fail during build (that's another story).

`-nodefaultlibs` appears several times in libc++ and libc++abi code and
I'm not sure about cleanest way to fix/workaround it.

Any suggestions?


[1]
https://github.com/llvm-mirror/libcxx/blob/master/cmake/config-ix.cmake#L27

[2] https://reviews.llvm.org/P7975

[3] https://reviews.llvm.org/P7976


Thanks,

Mateusz

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