rprichard wrote:

> This check in libcxx/cmake/config-ix.cmake seems to break:
> 
> ```
> check_cxx_compiler_flag(-nostdlib++ CXX_SUPPORTS_NOSTDLIBXX_FLAG)
> ```

This particular check was already using `check_cxx_compiler_flag` before this 
PR, so it was broken(?), but it apparently doesn't matter because the real 
check is in runtimes/CMakeLists.txt instead, and that was previously using 
`llvm_check_compiler_linker_flag`.

Not sure how the runtimes build influences the libcxx/libcxxabi builds. It 
feels like `CXX_SUPPORTS_NOSTDLIBXX_FLAG` from the runtimes build is being 
inherited?


https://github.com/llvm/llvm-project/pull/96171
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