[clang] [NFC] clang add DiagnosticsTestHelper decl (PR #112820)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Jinsong Ji (jsji)

<details>
<summary>Changes</summary>

This is one of the many PRs to fix errors with LLVM_ENABLE_WERROR=on. Built by 
GCC 11.

Fix warning

llvm-project/clang/unittests/Basic/DiagnosticTest.cpp:19:6: error: ‘void 
clang::DiagnosticsTestHelper(clang::DiagnosticsEngine&amp;)’ has not been 
declared within ‘clang’ [-Werror]
   19 | void clang::DiagnosticsTestHelper(DiagnosticsEngine &amp;diag) {
      |      ^~~~~
In file included from 
/iusers/jinsongj/llvm-project/clang/unittests/Basic/DiagnosticTest.cpp:9:
/iusers/jinsongj/llvm-project/clang/include/clang/Basic/Diagnostic.h:567:15: 
note: only here as a ‘friend’
  567 |   friend void DiagnosticsTestHelper(DiagnosticsEngine &amp;);


---
Full diff: https://github.com/llvm/llvm-project/pull/112820.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/Diagnostic.h (+2) 


``````````diff
diff --git a/clang/include/clang/Basic/Diagnostic.h 
b/clang/include/clang/Basic/Diagnostic.h
index 3b1efdb12824c7..3f6e85634c3cf5 100644
--- a/clang/include/clang/Basic/Diagnostic.h
+++ b/clang/include/clang/Basic/Diagnostic.h
@@ -1024,6 +1024,8 @@ class DiagnosticsEngine : public 
RefCountedBase<DiagnosticsEngine> {
   /// @}
 };
 
+void DiagnosticsTestHelper(DiagnosticsEngine &);
+
 /// RAII class that determines when any errors have occurred
 /// between the time the instance was created and the time it was
 /// queried.

``````````

</details>


https://github.com/llvm/llvm-project/pull/112820
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