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__.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191631 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index f1a1454..3ee9cd4 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -253,6 +253,11 @@
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) {
diff --git a/lib/Frontend/InitPreprocessor.cpp b/lib/Frontend/InitPreprocessor.cpp
index 8703a67..77cf3b3 100644
--- a/lib/Frontend/InitPreprocessor.cpp
+++ b/lib/Frontend/InitPreprocessor.cpp
@@ -330,6 +330,14 @@
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__");