[clang] [libc] [libcxx] [libc][libcxx] Support for building libc++ against LLVM libc (PR #99287)

[Petr Hosek via cfe-commits]

================
@@ -27,6 +27,9 @@ if (NOT LIBCXX_USE_COMPILER_RT)
   endif()
 endif()
 
+check_cxx_compiler_flag(-nostdlibinc CXX_SUPPORTS_NOSTDLIBINC_FLAG)
+check_cxx_compiler_flag(-nolibc CXX_SUPPORTS_NOLIBC_FLAG)
----------------
petrhosek wrote:

They're used now that I moved `-nostdlibinc` and `-nostdlib` to the interface target.

https://github.com/llvm/llvm-project/pull/99287