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

[Jake Egan via libcxx-commits]

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@@ -75,15 +73,24 @@ int main(int, char**)
           {
             std::filebuf f;
             f.open(tmp.c_str(), mode);
-            assert(!f.is_open()); // since it already exists
+            // On AIX, fopen() does not support the 'x' (exclusive) mode suffix so open()
+            // returns nullptr for all noreplace modes. On other platforms, the file already
+            // exists so noreplace causes open() to fail.
+            assert(!f.is_open());
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jakeegan wrote:

I don't think this comment is necessary.

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