Sema: Do not allow template declarations inside local classes

Summary:
Enforce the rule in C++11 [temp.mem]p2 that local classes cannot have
member templates.

This fixes PR16947.

N.B.  C++14 has slightly different wording to afford generic lambdas
declared inside of functions.

Fun fact:  Some formulations of local classes with member templates
would cause clang to crash during Itanium mangling, such as the
following:

void outer_mem() {
  struct Inner {
    template <typename = void>
    struct InnerTemplateClass {
      static void itc_mem() {}
    };
  };
  Inner::InnerTemplateClass<>::itc_mem();
}

Reviewers: eli.friedman, rsmith, doug.gregor, faisalv

Reviewed By: doug.gregor

CC: cfe-commits, ygao

Differential Revision: http://llvm-reviews.chandlerc.com/D1866

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193144 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 10 deletions

diff --git a/test/CodeGenCXX/mangle-local-class-names.cpp b/test/CodeGenCXX/mangle-local-class-names.cpp
index 186d76a225..8b950fcd17 100644
--- a/test/CodeGenCXX/mangle-local-class-names.cpp
+++ b/test/CodeGenCXX/mangle-local-class-names.cpp
@@ -75,16 +75,6 @@ inline void OmittingCode(float x) {
 }
 void CallOmittingCode() { OmittingCode(1); }
 
-// CHECK: @_ZZ25LocalTemplateFunctionTestdEN5Local3fooIdEET_S1_
-int LocalTemplateFunctionTest(double d) {
-  struct Local {
-    template<class T> T foo(T t) {
-      return t;
-    }
-  };
-  return Local().foo(d);
-}
-
 // CHECK: @_ZZ15LocalAnonStructvENUt0_1gEv
 inline void LocalAnonStruct() {
   if (0) {