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&)’ has not been
declared within ‘clang’ [-Werror]
19 | void clang::DiagnosticsTestHelper(DiagnosticsEngine &diag) {
| ^~~~~
In file included from
llvm-project/clang/unittests/Basic/DiagnosticTest.cpp:9:
llvm-project/clang/include/clang/Basic/Diagnostic.h:567:15: note: only
here as a ‘friend’
567 | friend void DiagnosticsTestHelper(DiagnosticsEngine &);
6a623e8484