[clang-tools-extra] [clang-tidy][libc] Fix namespace check with macro (PR #68134)

[Piotr Zegar via cfe-commits]

================
@@ -45,18 +45,20 @@ void CalleeNamespaceCheck::check(const 
MatchFinder::MatchResult &Result) {
   if (FuncDecl->getBuiltinID() != 0)
     return;
 
-  // If the outermost namespace of the function is __llvm_libc, we're good.
+  // If the outermost namespace of the function starts with __llvm_libc, we're
+  // good.
   const auto *NS = dyn_cast<NamespaceDecl>(getOutermostNamespace(FuncDecl));
-  if (NS && NS->getName() == "__llvm_libc")
+  if (NS && NS->getName().starts_with("__llvm_libc"))
----------------
PiotrZSL wrote:

Missing test for this change, anyway why this is changed ?

https://github.com/llvm/llvm-project/pull/68134
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