state of libc++ for msys's mingw

[user706]

Hi,

I'm trying to compile a simple c++ source

#include <iostream>

int main()
{
    std::cout << "hi" << std::endl;
}

with clang++ and libc++ under msys's mingw. It requires these packages:

pacman -S --needed \
        mingw-w64-i686-clang               mingw-w64-x86_64-clang              \
        mingw-w64-i686-libc++              mingw-w64-x86_64-libc++             \
        mingw-w64-i686-libc++abi           mingw-w64-x86_64-libc++abi

Now under Linux I can issue the following compile command, which works

clang++ -std=c++14 -stdlib=libc++ hello.cpp -o hello                                    -lc++abi
#or 
clang++ -std=c++14 -stdlib=libc++ hello.cpp -o hello -nodefaultlibs    -lc++ -lc++abi -lm -lc -lgcc_s -lgcc

But under msys2, I'm always failing...
I'm now using

clang++ -stdlib=libc++ hello.cpp -o hello -nodefaultlibs -std=c++14  -lc++ -lc++abi -lm -lc -lgcc_s -lgcc -lmingw32 -lmoldname -lmingwex -lmsvcrt -luser32 -lkernel32 -ladvapi32 -lshell32 -lmingw32 -lmoldname -lmingwex -lmsvcrt -lmingw32  -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt -luser32 -lkernel32 -ladvapi32 -lshell32 -lmingw32 -lgcc_s -lgcc -lmoldname -lmingwex -lmsvcrt -lpthread

(taking this as clue)
but still get errors like

C:\msys64\mingw64\lib/libc++.a(string.cpp.obj):(.rdata$.refptr._ZTVSt16invalid_argument[.refptr._ZTVSt16invalid_argument]+0x0): undefined reference to `vtable for std::invalid_argument'
[...]
C:\msys64\mingw64\lib/libc++.a(locale_win32.cpp.obj):(.text+0xbb7): undefined reference to `__libcpp_vasprintf(char**, char const*, char*)'
[...]
C:\msys64\mingw64\lib/libc++abi.a(stdlib_stdexcept.cpp.obj):(.text+0x28): undefined reference to `__imp__ZTVSt11logic_error'
[...]
C:\msys64\mingw64\lib/libc++abi.a(stdlib_typeinfo.cpp.obj):(.text+0x23): undefined reference to `__imp__ZTVSt8bad_cast'
[...]
C:\msys64\mingw64\lib/libc++abi.a(private_typeinfo.cpp.obj):(.text+0x2d): undefined reference to `__imp__ZNSt9type_infoD2Ev'
[...]
C:\msys64\mingw64\lib/libc++abi.a(cxa_exception.cpp.obj):(.text+0x39): undefined reference to `__imp__ZSt9terminatev'
[...]
C:\msys64\mingw64\lib/libc++abi.a(cxa_default_handlers.cpp.obj):(.text+0x14): undefined reference to `__imp__ZSt9terminatev'
C:\msys64\mingw64\lib/libc++abi.a(cxa_demangle.cpp.obj):(.text+0xde5): undefined reference to `__imp__ZSt9terminatev'
[...]
C:\msys64\mingw64\lib/libc++abi.a(cxa_aux_runtime.cpp.obj):(.text+0x17): undefined reference to `__imp__ZNSt8bad_castC1Ev'
[...]

Now I've seen:
https://github.com/martell/mingw-w64-clang/blob/8186317d9addb132701d83c588634ba6a4090cb9/README.MD#status

• libcxx - builds

so I'm beginning to believe that it might not be working yet!

Could you shed some light on this?
What is the state of msys's libc++? Is it usable? Which flags should I pass? Any usable cmake example?

Thanks.

[mati865]

This repository is not related to MSYS2 packages.
I think the issue with MSYS2 package is improperly built libc++abi.