[clang-tools-extra] [clang-tidy] new check readability-mark-static (PR #90830)

[Danny Mösch via cfe-commits]

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@@ -0,0 +1,80 @@
+//===--- UnnecessaryExternalLinkageCheck.cpp - clang-tidy ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "UnnecessaryExternalLinkageCheck.h"
+#include "clang/AST/Decl.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/ASTMatchers/ASTMatchersMacros.h"
+#include "clang/Basic/Specifiers.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::readability {
+
+namespace {
+
+AST_POLYMORPHIC_MATCHER(isFirstDecl,
+                        AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
+                                                        VarDecl)) {
+  return Node.isFirstDecl();
+}
+
+AST_MATCHER(Decl, isInMainFile) {
+  for (const Decl *D : Node.redecls())
+    if (!Finder->getASTContext().getSourceManager().isInMainFile(
+            D->getLocation()))
+      return false;
+  return true;
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SimplyDanny wrote:

Can be replaced by `std::all_of(...)`.

https://github.com/llvm/llvm-project/pull/90830