Fix C++ PCH issue.

The canonical FunctionTemplateDecl contains the specializations but we cannot use getCanonicalDecl on Template because it may still be initializing.
Write and read it from PCH.
Fixes http://llvm.org/PR8134

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113744 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Serialization/ASTWriterDecl.cpp b/lib/Serialization/ASTWriterDecl.cpp
index 3f990e7a56..76974667a8 100644
--- a/lib/Serialization/ASTWriterDecl.cpp
+++ b/lib/Serialization/ASTWriterDecl.cpp
@@ -257,6 +257,12 @@ void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
     }
     
     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
+
+    if (D->isCanonicalDecl()) {
+      // Write the template that contains the specializations set. We will
+      // add a FunctionTemplateSpecializationInfo to it when reading.
+      Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
+    }
     break;
   }
   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {