Pull in r144505 from upstream clang trunk:

Fix the signature of the getcontext builtin, eliminating incorrect
warnings about its prototype.

This also adds a -W(no-)builtin-requires-header option, which can be
used to enable or disable warnings of this kind.

MFC after:	1 week

1 files changed, 12 insertions, 2 deletions

diff --git a/contrib/llvm/tools/clang/lib/AST/ASTContext.cpp b/contrib/llvm/tools/clang/lib/AST/ASTContext.cpp
index 4624280..0833286 100644
--- a/contrib/llvm/tools/clang/lib/AST/ASTContext.cpp
+++ b/contrib/llvm/tools/clang/lib/AST/ASTContext.cpp
@@ -227,8 +227,9 @@ ASTContext::ASTContext(LangOptions& LOpts, SourceManager &SM,
     ObjCIdDecl(0), ObjCSelDecl(0), ObjCClassDecl(0),
     CFConstantStringTypeDecl(0), ObjCInstanceTypeDecl(0),
     FILEDecl(0), 
-    jmp_bufDecl(0), sigjmp_bufDecl(0), BlockDescriptorType(0), 
-    BlockDescriptorExtendedType(0), cudaConfigureCallDecl(0),
+    jmp_bufDecl(0), sigjmp_bufDecl(0), ucontext_tDecl(0),
+    BlockDescriptorType(0), BlockDescriptorExtendedType(0),
+    cudaConfigureCallDecl(0),
     NullTypeSourceInfo(QualType()),
     SourceMgr(SM), LangOpts(LOpts), 
     AddrSpaceMap(0), Target(t), PrintingPolicy(LOpts),
@@ -6293,6 +6294,15 @@ static QualType DecodeTypeFromStr(const char *&Str, const ASTContext &Context,
       return QualType();
     }
     break;
+  case 'K':
+    assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'K'!");
+    Type = Context.getucontext_tType();
+
+    if (Type.isNull()) {
+      Error = ASTContext::GE_Missing_ucontext;
+      return QualType();
+    }
+    break;
   }
 
   // If there are modifiers and if we're allowed to parse them, go for it.