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author | Richard Trieu <rtrieu@google.com> | 2013-06-12 21:20:57 +0000 |
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committer | Richard Trieu <rtrieu@google.com> | 2013-06-12 21:20:57 +0000 |
commit | 671538e8a51eab5bd65a1f9f327ba7f44f84e486 (patch) | |
tree | 3ac9cce6abe8b25d0db14b313c6b17b5549256f8 /lib/Lex/PPLexerChange.cpp | |
parent | a603569515eea06e54e6e041b1c690d33086f375 (diff) | |
download | clang-671538e8a51eab5bd65a1f9f327ba7f44f84e486.tar.gz clang-671538e8a51eab5bd65a1f9f327ba7f44f84e486.tar.bz2 clang-671538e8a51eab5bd65a1f9f327ba7f44f84e486.tar.xz |
Introducing -Wheader-guard, a warning that checks header guards actually work
properly. This warning checks that the #ifndef and #define directives at
the beginning of a header refer to the same macro name. Includes a fix-it
hint to correct the header guard.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183867 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Lex/PPLexerChange.cpp')
-rw-r--r-- | lib/Lex/PPLexerChange.cpp | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/lib/Lex/PPLexerChange.cpp b/lib/Lex/PPLexerChange.cpp index 6437336246..e521032bca 100644 --- a/lib/Lex/PPLexerChange.cpp +++ b/lib/Lex/PPLexerChange.cpp @@ -244,8 +244,29 @@ bool Preprocessor::HandleEndOfFile(Token &Result, bool isEndOfMacro) { CurPPLexer->MIOpt.GetControllingMacroAtEndOfFile()) { // Okay, this has a controlling macro, remember in HeaderFileInfo. if (const FileEntry *FE = - SourceMgr.getFileEntryForID(CurPPLexer->getFileID())) + SourceMgr.getFileEntryForID(CurPPLexer->getFileID())) { HeaderInfo.SetFileControllingMacro(FE, ControllingMacro); + if (const IdentifierInfo *DefinedMacro = + CurPPLexer->MIOpt.GetDefinedMacro()) { + if (!ControllingMacro->hasMacroDefinition() && + DefinedMacro != ControllingMacro && + HeaderInfo.FirstTimeLexingFile(FE)) { + // Emit a warning for a bad header guard. + Diag(CurPPLexer->MIOpt.GetMacroLocation(), + diag::warn_header_guard) + << CurPPLexer->MIOpt.GetMacroLocation() + << ControllingMacro; + Diag(CurPPLexer->MIOpt.GetDefinedLocation(), + diag::note_header_guard) + << CurPPLexer->MIOpt.GetDefinedLocation() + << DefinedMacro + << ControllingMacro + << FixItHint::CreateReplacement( + CurPPLexer->MIOpt.GetDefinedLocation(), + ControllingMacro->getName()); + } + } + } } } |