================
@@ -0,0 +1,35 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef 
LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_CUSTOMERRNODECLARATIONCHECK_H
+#define 
LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_CUSTOMERRNODECLARATIONCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::bugprone {
+
+/// Warns if you declare an extern int variable named 'errno'.
+///
+/// For the user-facing documentation see:
+/// 
https://clang.llvm.org/extra/clang-tidy/checks/bugprone/custom-errno-declaration.html
+class CustomErrnoDeclarationCheck : public ClangTidyCheck {
+public:
+  CustomErrnoDeclarationCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+  bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
+    return LangOpts.CPlusPlus;
----------------
zeyi2 wrote:

MSC38-C is part of CERT C Coding Standard, so we should support C Language as 
well

https://github.com/llvm/llvm-project/pull/213015
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