[libcxx-commits] [libcxx] [libc++] Fix C++23 standard modules when using with `clang-cl` on Windows (PR #148992)

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@@ -51,6 +51,9 @@ module;
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#ifdef _LIBCPP_ABI_VCRUNTIME
+#define _BUILD_STD_MODULE
+#endif
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siradam7th wrote:

I defined before the include to make it known why it is needed, I'll look into moving it

https://github.com/llvm/llvm-project/pull/148992