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[Clang] Do not warn for serialized builtin or command-line definitions #137306

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Merged
merged 2 commits into from
May 1, 2025
Merged

[Clang] Do not warn for serialized builtin or command-line definitions #137306

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Pre-commit test: [Clang] Do not warn for serialized builtin or comman…
jmmartinez Apr 25, 2025
40812df
[Clang] Do not warn for serialized builtin or command-line definitions
jmmartinez Apr 25, 2025
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8 changes: 6 additions & 2 deletions clang/lib/Lex/PPDirectives.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -371,8 +371,12 @@ bool Preprocessor::CheckMacroName(Token &MacroNameTok, MacroUse isDefineUndef,
SourceLocation MacroNameLoc = MacroNameTok.getLocation();
if (ShadowFlag)
*ShadowFlag = false;
if (!SourceMgr.isInSystemHeader(MacroNameLoc) &&
(SourceMgr.getBufferName(MacroNameLoc) != "<built-in>")) {
// Macro names with reserved identifiers are accepted if built-in or passed
// through the command line (the later may be present if -dD was used to
// generate the preprocessed file).
bool IsBuiltinOrCmd = SourceMgr.isWrittenInBuiltinFile(MacroNameLoc) ||
SourceMgr.isWrittenInCommandLineFile(MacroNameLoc);
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Can at least combine these to avoid the duplicate getPresumedLoc(), but possibly these can be more efficient in general? E.g. isInSystemHeader has a much more optimized implementation.

if (!IsBuiltinOrCmd && !SourceMgr.isInSystemHeader(MacroNameLoc)) {
MacroDiag D = MD_NoWarn;
if (isDefineUndef == MU_Define) {
D = shouldWarnOnMacroDef(*this, II);
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11 changes: 11 additions & 0 deletions clang/test/Preprocessor/macro_reserved.i
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@@ -0,0 +1,11 @@
// RUN: %clang_cc1 -fsyntax-only -verify -x cpp-output %s
#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wreserved-macro-identifier"
# 1 "<built-in>" 1
#define __BUILTIN__
# 2 "<command line>" 1
#define __CMD__
# 3 "biz.cpp" 1
#define __SOME_FILE__ // expected-warning {{macro name is a reserved identifier}}
int v;
#pragma clang diagnostic pop
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