From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Thu, 3 May 2012 22:18:20 +0000 (+0000)
Subject: Use the standard values for the __cplusplus macro, even when in GNU mode. GCC
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0513448ae71478fd08d7e925bab46db1ddac3dfa;p=clang

Use the standard values for the __cplusplus macro, even when in GNU mode. GCC
dropped its prior behavior of always defining __cplusplus to 1 in GNU mode in
version 4.7.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156113 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index 93d49b0563..4df7cfd5be 100644
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -288,20 +288,16 @@ static void InitializeStandardPredefinedMacros(const TargetInfo &TI,
     else if (!LangOpts.GNUMode && LangOpts.Digraphs)
       Builder.defineMacro("__STDC_VERSION__", "199409L");
   } else {
-    if (LangOpts.GNUMode)
-      Builder.defineMacro("__cplusplus");
-    else {
-      // C++0x [cpp.predefined]p1:
-      //   The name_ _cplusplus is defined to the value 201103L when compiling a
-      //   C++ translation unit.
-      if (LangOpts.CPlusPlus0x)
-        Builder.defineMacro("__cplusplus", "201103L");
-      // C++03 [cpp.predefined]p1:
-      //   The name_ _cplusplus is defined to the value 199711L when compiling a
-      //   C++ translation unit.
-      else
-        Builder.defineMacro("__cplusplus", "199711L");
-    }
+    // C++11 [cpp.predefined]p1:
+    //   The name __cplusplus is defined to the value 201103L when compiling a
+    //   C++ translation unit.
+    if (LangOpts.CPlusPlus0x)
+      Builder.defineMacro("__cplusplus", "201103L");
+    // C++03 [cpp.predefined]p1:
+    //   The name __cplusplus is defined to the value 199711L when compiling a
+    //   C++ translation unit.
+    else
+      Builder.defineMacro("__cplusplus", "199711L");
   }
 
   if (LangOpts.ObjC1)
diff --git a/test/Preprocessor/init.c b/test/Preprocessor/init.c
index 0505fffedd..4d5c36c759 100644
--- a/test/Preprocessor/init.c
+++ b/test/Preprocessor/init.c
@@ -62,12 +62,21 @@
 // 
 // RUN: %clang_cc1 -ffreestanding -E -dM < /dev/null | FileCheck -check-prefix FREESTANDING %s
 // FREESTANDING:#define __STDC_HOSTED__ 0
-// 
+//
+//
+// RUN: %clang_cc1 -x c++ -std=gnu++11 -E -dM < /dev/null | FileCheck -check-prefix GXX11 %s
+//
+// GXX11:#define __GNUG__
+// GXX11:#define __GXX_WEAK__ 1
+// GXX11:#define __cplusplus 201103L
+// GXX11:#define __private_extern__ extern
+//
+//
 // RUN: %clang_cc1 -x c++ -std=gnu++98 -E -dM < /dev/null | FileCheck -check-prefix GXX98 %s
 //
 // GXX98:#define __GNUG__
 // GXX98:#define __GXX_WEAK__ 1
-// GXX98:#define __cplusplus 1
+// GXX98:#define __cplusplus 199711L
 // GXX98:#define __private_extern__ extern
 //
 //