[clang] nonblocking/nonallocating attributes (was: nolock/noalloc) (PR #84983)

[Doug Wyatt via cfe-commits]

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@@ -1868,6 +1868,28 @@ bool Sema::IsFunctionConversion(QualType FromType, QualType ToType,
       FromFn = QT->getAs<FunctionType>();
       Changed = true;
     }
+
+    if (getLangOpts().CPlusPlus) {
+      // For C, when called from checkPointerTypesForAssignment,
+      // we need not to change the type, or else even an innocuous cast
+      // like dropping effects will fail.
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dougsonos wrote:

Cleaned this up

https://github.com/llvm/llvm-project/pull/84983