rprichard wrote: This check in libcxx/cmake/config-ix.cmake seems to break: ``` check_cxx_compiler_flag(-nostdlib++ CXX_SUPPORTS_NOSTDLIBXX_FLAG) ```
It appears that it isn't passing either `-nostdlib++` or `-lc++` to the clang linker command-line, but then `-lc++` _is_ passed to `ld.lld` because `-nostdlib++` is missing. The check fails because libc++ hasn't been built yet. It seems that the older function had been dealing with this: ``` -function(llvm_check_compiler_linker_flag lang flag out_var) - # If testing a flag with check_c_compiler_flag, it gets added to the compile - # command only, but not to the linker command in that test. If the flag - # is vital for linking to succeed, the test would fail even if it would - # have succeeded if it was included on both commands. - # - # Therefore, try adding the flag to CMAKE_REQUIRED_FLAGS, which gets - # added to both compiling and linking commands in the tests. ... ``` It sounds like the right fix is to use `check_linker_flag` though? I can test that... https://github.com/llvm/llvm-project/pull/96171 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
