[clang-tidy] Don't issue cppcoreguidelines-macro-usage on builtin macros

Before the patch calling clang-tidy with -header-filter=.* -system-headers would
result in a few hundred useless warnings:
  warning: macro '_GNU_SOURCE' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '_LP64' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__ATOMIC_ACQUIRE' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__ATOMIC_ACQ_REL' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__ATOMIC_CONSUME' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__ATOMIC_RELAXED' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__ATOMIC_RELEASE' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__ATOMIC_SEQ_CST' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  warning: macro '__BIGGEST_ALIGNMENT__' used to declare a constant; consider using a 'constexpr' constant [cppcoreguidelines-macro-usage]
  ... and so on

llvm-svn: 358621

diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp b/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp
index 01c25d2..ac5ec13 100644 (file)
--- a/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/MacroUsageCheck.cpp
@@ -36,7 +36,8 @@ public:
         IgnoreCommandLineMacros(IgnoreCommandLine) {}
   void MacroDefined(const Token &MacroNameTok,
                     const MacroDirective *MD) override {
-    if (MD->getMacroInfo()->isUsedForHeaderGuard() ||
+    if (SM.isWrittenInBuiltinFile(MD->getLocation()) ||
+        MD->getMacroInfo()->isUsedForHeaderGuard() ||
         MD->getMacroInfo()->getNumTokens() == 0)
       return;
 

diff --git a/clang-tools-extra/test/clang-tidy/cppcoreguidelines-macro-usage.cpp b/clang-tools-extra/test/clang-tidy/cppcoreguidelines-macro-usage.cpp
index a4948f5..edce328 100644 (file)
--- a/clang-tools-extra/test/clang-tidy/cppcoreguidelines-macro-usage.cpp
+++ b/clang-tools-extra/test/clang-tidy/cppcoreguidelines-macro-usage.cpp
@@ -1,4 +1,4 @@
-// RUN: %check_clang_tidy %s cppcoreguidelines-macro-usage %t
+// RUN: %check_clang_tidy %s cppcoreguidelines-macro-usage %t -- -header-filter=.* -system-headers --
 
 #ifndef INCLUDE_GUARD
 #define INCLUDE_GUARD