[clang] [clang] WIP: Warn on mismatched RequiresCapability attributes (PR #67520)

[Timm Baeder via cfe-commits]

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================
@@ -2249,7 +2249,7 @@ void fooF1(Foo *f) EXCLUSIVE_LOCKS_REQUIRED(f->mu_) {
   f->a = 1;
 }
 
-void fooF2(Foo *f);
+void fooF2(Foo *f); // expected-warning {{attribute mismatch between function 
declarations of 'fooF2'}}
 void fooF2(Foo *f) EXCLUSIVE_LOCKS_REQUIRED(f->mu_) {
----------------
tbaederr wrote:

I guess that would make a little more sense, but swapping them also causes the 
note to not get emitted somehow.

https://github.com/llvm/llvm-project/pull/67520
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