Instantiate incomplete class used in template method.
If a class is absent from instantiation and is incomplete, instantiate it as
an incomplete class thus avoiding compiler crash.
This change fixes PR18653.
Differential Revision: http://reviews.llvm.org/D8281
llvm-svn: 236426
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 8f2e95a..41245d9 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -4434,6 +4434,14 @@
if (D->isInvalidDecl())
return nullptr;
+ // Tag type may be referenced prior to definition, in this case it must be
+ // instantiated now.
+ if (const TagDecl *TD = dyn_cast<TagDecl>(D)) {
+ Decl *Inst = SubstDecl(D, CurContext, TemplateArgs);
+ CurrentInstantiationScope->InstantiatedLocal(D, Inst);
+ return cast<TypeDecl>(Inst);
+ }
+
// If we didn't find the decl, then we must have a label decl that hasn't
// been found yet. Lazily instantiate it and return it now.
assert(isa<LabelDecl>(D));