[modules] Fix merging of default template arguments onto friend templates.

Previously we'd complain about redefinition of default arguments when we
instantiated a class with a friend template that inherits its default argument,
because we propagate the default template arguemnt onto the friend when we
reload the AST.

llvm-svn: 239857

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index d0a573981bd..f35d1aaf77e 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -1922,7 +1922,7 @@ Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
                                  D->isParameterPack());
   Inst->setAccess(AS_public);
 
-  if (D->hasDefaultArgument()) {
+  if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited()) {
     TypeSourceInfo *InstantiatedDefaultArg =
         SemaRef.SubstType(D->getDefaultArgumentInfo(), TemplateArgs,
                           D->getDefaultArgumentLoc(), D->getDeclName());
@@ -2078,7 +2078,7 @@ Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
   if (Invalid)
     Param->setInvalidDecl();
 
-  if (D->hasDefaultArgument()) {
+  if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited()) {
     ExprResult Value = SemaRef.SubstExpr(D->getDefaultArgument(), TemplateArgs);
     if (!Value.isInvalid())
       Param->setDefaultArgument(Value.get());
@@ -2205,7 +2205,7 @@ TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
                                              D->getPosition(),
                                              D->isParameterPack(),
                                              D->getIdentifier(), InstParams);
-  if (D->hasDefaultArgument()) {
+  if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited()) {
     NestedNameSpecifierLoc QualifierLoc =
         D->getDefaultArgument().getTemplateQualifierLoc();
     QualifierLoc =