[libcxx-commits] [libcxx] [libc++] "Always" include_next for non C++ path in stdatomic.h (PR #178463)

[James Y Knight via libcxx-commits]

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@@ -231,7 +231,7 @@ using std::atomic_store_explicit _LIBCPP_USING_IF_EXISTS;
 using std::atomic_signal_fence _LIBCPP_USING_IF_EXISTS;
 using std::atomic_thread_fence _LIBCPP_USING_IF_EXISTS;
 
-#  elif defined(_LIBCPP_COMPILER_CLANG_BASED)
+#  else
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jyknight wrote:

In _C++_ mode, this still shouldn't `#include_next <stdatomic.h>` for non-clang compilers, because a C-based stdatomic.h doesn't work in C++ mode under GCC. (Note that we're in the else condition of `#  if defined(__cplusplus) && _LIBCPP_STD_VER >= 23` here).

I believe this should read: `#  elif !defined(__cplusplus) || defined(_LIBCPP_COMPILER_CLANG_BASED)`

https://github.com/llvm/llvm-project/pull/178463