[libcxx-commits] [libcxx] [AIX][libc++] fopen() does not support the 'x' (exclusive/noreplace) mode suffix. (PR #206498)

[Jake Egan via libcxx-commits]

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@@ -1208,6 +1219,8 @@ public:
   [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool is_open() const;
   void open(const char* __s, ios_base::openmode __mode = ios_base::in);
 #    if _LIBCPP_HAS_OPEN_WITH_WCHAR
+  _LIBCPP_DIAGNOSE_WARNING((__mode & ios_base::noreplace) && defined(_AIX),
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jakeegan wrote:

Checking `_AIX` with a preprocessor conditional should resolve the compilation failure on the CI.

https://github.com/llvm/llvm-project/pull/206498