Support __wchar_t in -fms-extensions and -fms-compatibility modes.

MSVC provides __wchar_t, either as an alias for the built-in wchar_t
type, or as a separate type depending on language (C vs C++) and flags
(-fno-wchar).

In -fms-extensions, Clang will simply accept __wchar_t as an alias for
whatever type is used for wide character literals. In -fms-compatibility, we
try to mimic MSVC's behavior by always making __wchar_t a builtin type.

This fixes PR15815.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 1 deletions

diff --git a/include/clang/AST/PrettyPrinter.h b/include/clang/AST/PrettyPrinter.h
index e3c09e7b41..36e90724d9 100644
--- a/include/clang/AST/PrettyPrinter.h
+++ b/include/clang/AST/PrettyPrinter.h
@@ -40,7 +40,8 @@ struct PrintingPolicy {
       SuppressUnwrittenScope(false), SuppressInitializers(false),
       ConstantArraySizeAsWritten(false), AnonymousTagLocations(true),
       SuppressStrongLifetime(false), Bool(LO.Bool),
-      TerseOutput(false), PolishForDeclaration(false) { }
+      TerseOutput(false), PolishForDeclaration(false),
+      MSWChar(LO.MicrosoftMode && !LO.WChar) { }
 
   /// \brief What language we're printing.
   LangOptions LangOpts;
@@ -146,6 +147,10 @@ struct PrintingPolicy {
   /// declaration tag; such as, do not print attributes attached to the declaration.
   ///
   unsigned PolishForDeclaration : 1;
+
+  /// \brief When true, print the built-in wchar_t type as __wchar_t. For use in
+  /// Microsoft mode when wchar_t is not available.
+  unsigned MSWChar : 1;
 };
 
 } // end namespace clang