================
@@ -0,0 +1,49 @@
+//===--- AvoidPragmaOnceCheck.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 "AvoidPragmaOnceCheck.h"
+
+#include "clang/Basic/SourceManager.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clang::tidy::portability {
+
+class PragmaOnceCallbacks : public PPCallbacks {
+public:
+ PragmaOnceCallbacks(AvoidPragmaOnceCheck *Check, const SourceManager &SM)
+ : Check(Check), SM(SM) {}
+ void PragmaDirective(SourceLocation Loc,
+ PragmaIntroducerKind Introducer) override {
+ auto Str = llvm::StringRef(SM.getCharacterData(Loc));
+ if (!Str.consume_front("#")) {
+ return;
+ }
+ Str = Str.trim();
+ if (!Str.consume_front("pragma")) {
+ return;
+ }
+ Str = Str.trim();
+ if (Str.starts_with("once")) {
+ Check->diag(Loc, "Avoid pragma once.");
----------------
vbvictor wrote:
```suggestion
Check->diag(Loc, "avoid 'pragma once'");
```
Messages should start with lowercase and no dot, language constructs in singe
ticks for readability.
https://github.com/llvm/llvm-project/pull/140388
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