4 files changed, 9 insertions, 3 deletions
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index f8f568cbb4..24ddb127bd 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -141,8 +141,8 @@ ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM,
                        bool FreeMem, unsigned size_reserve) :
   TemplateSpecializationTypes(this_()),
   DependentTemplateSpecializationTypes(this_()),
-  GlobalNestedNameSpecifier(0), CFConstantStringTypeDecl(0),
-  NSConstantStringTypeDecl(0),
+  GlobalNestedNameSpecifier(0), IsInt128Installed(false),
+  CFConstantStringTypeDecl(0), NSConstantStringTypeDecl(0),
   ObjCFastEnumerationStateTypeDecl(0), FILEDecl(0), jmp_bufDecl(0),
   sigjmp_bufDecl(0), BlockDescriptorType(0), BlockDescriptorExtendedType(0),
   NullTypeSourceInfo(QualType()),
diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index 198fd434c8..27ca86f2f1 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -1769,6 +1769,9 @@ void PCHReader::InitializeContext(ASTContext &Ctx) {
     Context->ObjCSelRedefinitionType = GetType(ObjCSelRedef);
   if (unsigned String = SpecialTypes[pch::SPECIAL_TYPE_NS_CONSTANT_STRING])
     Context->setNSConstantStringType(GetType(String));
+
+  if (SpecialTypes[pch::SPECIAL_TYPE_INT128_INSTALLED])
+    Context->setInt128Installed();
 }
 
 /// \brief Retrieve the name of the original source file name
diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index 52db0ee1e7..1177b9452b 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/lib/Frontend/PCHWriter.cpp
@@ -2159,6 +2159,7 @@ void PCHWriter::WritePCH(Sema &SemaRef, MemorizeStatCalls *StatCalls,
   AddTypeRef(Context.getRawBlockdescriptorExtendedType(), Record);
   AddTypeRef(Context.ObjCSelRedefinitionType, Record);
   AddTypeRef(Context.getRawNSConstantStringType(), Record);
+  Record.push_back(Context.isInt128Installed());
   Stream.EmitRecord(pch::SPECIAL_TYPES, Record);
 
   // Keep writing types and declarations until all types and
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index 3e23ad3030..6194c293d2 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -46,7 +46,8 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
 
   VAListTagName = PP.getIdentifierInfo("__va_list_tag");
 
-  if (PP.getTargetInfo().getPointerWidth(0) >= 64) {
+  if (!Context.isInt128Installed() && // May be set by PCHReader.
+      PP.getTargetInfo().getPointerWidth(0) >= 64) {
     TypeSourceInfo *TInfo;
 
     // Install [u]int128_t for 64-bit targets.
@@ -61,6 +62,7 @@ void Sema::ActOnTranslationUnitScope(SourceLocation Loc, Scope *S) {
                                           SourceLocation(),
                                           &Context.Idents.get("__uint128_t"),
                                           TInfo), TUScope);
+    Context.setInt128Installed();
   }