clang_5 experimental headers for c++

[grr...@gmail.com]

Hi, List.

I tried to follow clang's C++ coroutines guide [1] to test the new feature, but unfortunately got an error 

'experimental/coroutine' file not found

Looks like the problem is the experimental headers and libs are missing from the package. I've learned that one need to set certain CMake options described here: https://releases.llvm.org/5.0.0/projects/libcxx/docs/BuildingLibcxx.html#libc-experimental-options . The thing I don't understand at the moment is which expression to tweak. We have clang and clang-eabi versions in the tree, which one should I choose? Could someone guide me throw the process of enabling the experimentals?

Regards,

Sergey

[1] - http://releases.llvm.org/5.0.0/tools/clang/docs/ReleaseNotes.html#c-coroutines

[Jörg Thalheim]

If you want libcxx instead of gcc's c++ header take a look at clangStdenv
instead of stdenv (unless you are on macOS where this is the default).
Then modify the expression at nixpkgs/pkgs/development/compilers/llvm/5/libc++
to include your cmake flags.

[Sergey Mironov]

Jörg, I've found a solution inspired by your answer. Thank you very
much. It turns out that I tried to use clang with libstdc++ from gcc.
Changing my development shell expression from `stdenv.mkDerivation {
name = 'foo'; ... }` to
`pkgs.llvmPackages_5..libcxxStdenv.mkDerivation { name = 'foo'; ... }`
worked for me out of the box. Coroutine header is already included and
I don't need to re-compile clang.

Regards,
Sergey

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