PR12937: Explicitly deleting an explicit template specialization.

This works around a quirk in the way that explicit template specializations are
handled in Clang. We generate an implicit declaration from the original
template which the explicit specialization is considered to redeclare. This
trips up the explicit delete logic.

This change only works around that strange representation. At some point it'd
be nice to remove those extra declarations to make the AST more accurately
reflect the C++ semantics.

Review by Doug Gregor.

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index 8280835..dab2d4d 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -10316,8 +10316,13 @@
   if (const FunctionDecl *Prev = Fn->getPreviousDecl()) {
-    Diag(DelLoc, diag::err_deleted_decl_not_first);
-    Diag(Prev->getLocation(), diag::note_previous_declaration);
+    // Don't consider the implicit declaration we generate for explicit
+    // specializations. FIXME: Do not generate these implicit declarations.
+    if (Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization
+        || Prev->getPreviousDecl()) {
+      Diag(DelLoc, diag::err_deleted_decl_not_first);
+      Diag(Prev->getLocation(), diag::note_previous_declaration);
+    }
     // If the declaration wasn't the first, we delete the function anyway for
     // recovery.
diff --git a/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.delete/p4.cpp b/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.delete/p4.cpp
new file mode 100644
index 0000000..16fd5e6
--- /dev/null
+++ b/test/CXX/dcl.decl/dcl.fct.def/dcl.fct.def.delete/p4.cpp
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+template<typename> void func();
+template<> void func<int>() = delete;
+template<typename> void func2();
+template<> void func2<int>(); // expected-note {{previous declaration is here}}
+template<> void func2<int>() = delete; // expected-error {{deleted definition must be first declaration}}
diff --git a/test/SemaCXX/deleted-function.cpp b/test/SemaCXX/deleted-function.cpp
index d13fd0e..2ee6064 100644
--- a/test/SemaCXX/deleted-function.cpp
+++ b/test/SemaCXX/deleted-function.cpp
@@ -55,3 +55,11 @@
   ~Z() {} // expected-error {{attempt to use a deleted function}}
 DelDtor dd; // expected-error {{attempt to use a deleted function}}
+template<typename> void test2() = delete;
+template void test2<int>();
+// test3 really shouldn't have behavior that differs from test2 above
+template<typename> void test3() = delete; // expected-note {{explicit instantiation refers here}}
+template<typename> void test3();
+template void test3<int>(); // expected-error {{explicit instantiation of undefined function template 'test3'}}