[clang] [HLSL] Run availability diagnostic on exported functions (PR #97352)

[Helena Kotas via cfe-commits]

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@@ -129,6 +129,55 @@ class MyClass
   }
 };
 
+// Exported function without body - not used
+export void exportedFunctionUnused(float f);
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hekota wrote:

Good catch! This is currently not reporting an error and the redeclaration is not recognized as exported function and therefore not included in the diagnostic scan. I believe the check whether to scan a function or not should be based on whether the function has an external linkage or not. This cannot be implemented until issue #92071 is resolved though. I'll see if I can fix this without the default linkage change.


https://github.com/llvm/llvm-project/pull/97352