Lazily provide a __float128 dummy type in -std=gnu++11 mode.

This is needed to parse libstdc++ 4.7's type_traits, see PR13530.

llvm-svn: 184476

1 files changed, 14 insertions, 1 deletions

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index c76ed5fdb98..870e09cc674 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -698,7 +698,7 @@ ASTContext::ASTContext(LangOptions& LOpts, SourceManager &SM,
     DependentTemplateSpecializationTypes(this_()),
     SubstTemplateTemplateParmPacks(this_()),
     GlobalNestedNameSpecifier(0), 
-    Int128Decl(0), UInt128Decl(0),
+    Int128Decl(0), UInt128Decl(0), Float128StubDecl(0),
     BuiltinVaListDecl(0),
     ObjCIdDecl(0), ObjCSelDecl(0), ObjCClassDecl(0), ObjCProtocolClassDecl(0),
     BOOLDecl(0),
@@ -857,6 +857,19 @@ TypedefDecl *ASTContext::getUInt128Decl() const {
   return UInt128Decl;
 }
 
+TypeDecl *ASTContext::getFloat128StubType() const {
+  if (!Float128StubDecl) {
+    Float128StubDecl = RecordDecl::Create(const_cast<ASTContext &>(*this), 
+                                          TTK_Struct,
+                                          getTranslationUnitDecl(),
+                                          SourceLocation(),
+                                          SourceLocation(),
+                                          &Idents.get("__float128"));
+  }
+  
+  return Float128StubDecl;
+}
+
 void ASTContext::InitBuiltinType(CanQualType &R, BuiltinType::Kind K) {
   BuiltinType *Ty = new (*this, TypeAlignment) BuiltinType(K);
   R = CanQualType::CreateUnsafe(QualType(Ty, 0));