r191631 - Add character set related __STDC_* definitions.

[Ed Schouten]

Author: ed
Date: Sun Sep 29 02:54:52 2013
New Revision: 191631

URL: http://llvm.org/viewvc/llvm-project?rev=191631&view=rev
Log:
Add character set related __STDC_* definitions.

Clang uses UTF-16 and UTF-32 for its char16_t's and char32_t's
exclusively. This means that we can define __STDC_UTF_16__ and
__STDC_UTF_32__ unconditionally.

While there, define __STDC_MB_MIGHT_NEQ_WC__ for FreeBSD. FreeBSD's
wchar_t's don't encode characters as ISO-10646; the encoding depends on
the locale used. Because the character set used might not be a superset
of ASCII, we must define __STDC_MB_MIGHT_NEQ_WC__.


Modified:
    cfe/trunk/lib/Basic/Targets.cpp
    cfe/trunk/lib/Frontend/InitPreprocessor.cpp
    cfe/trunk/test/Preprocessor/init.c

Modified: cfe/trunk/lib/Basic/Targets.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Targets.cpp?rev=191631&r1=191630&r2=191631&view=diff
==============================================================================
--- cfe/trunk/lib/Basic/Targets.cpp (original)
+++ cfe/trunk/lib/Basic/Targets.cpp Sun Sep 29 02:54:52 2013
@@ -253,6 +253,11 @@ protected:
     Builder.defineMacro("__KPRINTF_ATTRIBUTE__");
     DefineStd(Builder, "unix", Opts);
     Builder.defineMacro("__ELF__");
+
+    // On FreeBSD, wchar_t contains the number of the code point as
+    // used by the character set of the locale. These character sets are
+    // not necessarily a superset of ASCII.
+    Builder.defineMacro("__STDC_MB_MIGHT_NEQ_WC__", "1");
   }
 public:
   FreeBSDTargetInfo(const llvm::Triple &Triple) : OSTargetInfo<Target>(Triple) {

Modified: cfe/trunk/lib/Frontend/InitPreprocessor.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Frontend/InitPreprocessor.cpp?rev=191631&r1=191630&r2=191631&view=diff
==============================================================================
--- cfe/trunk/lib/Frontend/InitPreprocessor.cpp (original)
+++ cfe/trunk/lib/Frontend/InitPreprocessor.cpp Sun Sep 29 02:54:52 2013
@@ -330,6 +330,14 @@ static void InitializeStandardPredefined
       Builder.defineMacro("__cplusplus", "199711L");
   }
 
+  // In C11 these are environment macros. In C++11 they are only defined
+  // as part of <cuchar>. To prevent breakage when mixing C and C++
+  // code, define these macros unconditionally. We can define them
+  // unconditionally, as Clang always uses UTF-16 and UTF-32 for 16-bit
+  // and 32-bit character literals.
+  Builder.defineMacro("__STDC_UTF_16__", "1");
+  Builder.defineMacro("__STDC_UTF_32__", "1");
+
   if (LangOpts.ObjC1)
     Builder.defineMacro("__OBJC__");
 

Modified: cfe/trunk/test/Preprocessor/init.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Preprocessor/init.c?rev=191631&r1=191630&r2=191631&view=diff
==============================================================================
--- cfe/trunk/test/Preprocessor/init.c (original)
+++ cfe/trunk/test/Preprocessor/init.c Sun Sep 29 02:54:52 2013
@@ -49,6 +49,14 @@
 // C99:#define __STRICT_ANSI__ 1
 //
 // 
+// RUN: %clang_cc1 -std=c11 -E -dM < /dev/null | FileCheck -check-prefix C11 %s
+//
+// C11:#define __STDC_UTF_16__ 1
+// C11:#define __STDC_UTF_32__ 1
+// C11:#define __STDC_VERSION__ 201112L
+// C11:#define __STRICT_ANSI__ 1
+//
+// 
 // RUN: %clang_cc1 -E -dM < /dev/null | FileCheck -check-prefix COMMON %s
 //
 // COMMON:#define __CONSTANT_CFSTRINGS__ 1
@@ -2925,6 +2933,12 @@
 // X86_64-LINUX:#define __x86_64 1
 // X86_64-LINUX:#define __x86_64__ 1
 //
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=x86_64-unknown-freebsd9.1 < /dev/null | FileCheck -check-prefix X86_64-FREEBSD %s
+//
+// X86_64-FREEBSD:#define __FreeBSD__ 9
+// X86_64-FREEBSD:#define __FreeBSD_cc_version 900001
+// X86_64-FREEBSD:#define __STDC_MB_MIGHT_NEQ_WC__ 1
+//
 // RUN: %clang_cc1 -E -dM -ffreestanding -triple=sparc64-none-none < /dev/null | FileCheck -check-prefix SPARCV9 %s
 // SPARCV9:#define __INT64_TYPE__ long int
 // SPARCV9:#define __INTMAX_TYPE__ long int