[clang-tidy] Fix fix-it overlaps in readability-static-definition-in-anonymous-namespace (#86599)

Because check emitted multiple warnings for every template instance
fix-it couldn't be applied due to overlaps.

Using TK_IgnoreUnlessSpelledInSource and restricting check to C++ only.

1 files changed, 11 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/static-definition-in-anonymous-namespace.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/static-definition-in-anonymous-namespace.cpp
index e9938db..e204199 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/static-definition-in-anonymous-namespace.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/static-definition-in-anonymous-namespace.cpp
@@ -51,6 +51,17 @@ static int c = 1;
 } // namespace deep_inner
 } // namespace inner
 
+template<typename T>
+static void printTemplate(T&&) {}
+// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: 'printTemplate' is a static definition in anonymous namespace; static is redundant here [readability-static-definition-in-anonymous-namespace]
+// CHECK-FIXES: {{^}}void printTemplate(T&&) {}
+
+void testTemplate() {
+  printTemplate(5);
+  printTemplate(5U);
+  printTemplate("some string");
+}
+
 } // namespace
 
 namespace N {