re PR c++/46336 ([C++0X] ICE on invalid: in register_constexpr_fundef, at cp/semantics.c:5571)

	PR c++/46336
	* decl.c (duplicate_decls): Return NULL_TREE for clashing
	C functions.

From-SVN: r171084

gcc/cp/ChangeLog

 2011-03-16  Jason Merrill  <jason@redhat.com>
 
+	PR c++/46336
+	* decl.c (duplicate_decls): Return NULL_TREE for clashing
+	C functions.
+
 	PR c++/47570
 	* semantics.c (cxx_eval_constant_expression) [COMPOUND_EXPR]: Don't
 	use the generic binary expression handling.

gcc/cp/decl.c

@@ -1456,6 +1456,7 @@ duplicate_decls (tree newdecl, tree olddecl, bool newdecl_is_friend)
 	      error ("declaration of C function %q#D conflicts with",
 		     newdecl);
 	      error ("previous declaration %q+#D here", olddecl);
+	      return NULL_TREE;
 	    }
 	  else if (compparms (TYPE_ARG_TYPES (TREE_TYPE (newdecl)),
 			      TYPE_ARG_TYPES (TREE_TYPE (olddecl))))

gcc/testsuite/ChangeLog

 2011-03-16  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/constexpr-46336.C: New.
+	* g++.dg/parse/friend5.C: Adjust expected errors.
+
 	* g++.dg/cpp0x/constexpr-47570.C: New.
 
 2011-03-16  Dodji Seketeli  <dodji@redhat.com>

gcc/testsuite/g++.dg/cpp0x/constexpr-46336.C

+// PR c++/46336
+// { dg-options -std=c++0x }
+
+extern "C" {
+  enum A { };
+  inline constexpr A
+  f(A a, A b)			// { dg-error "previous declaration" }
+  { return A(static_cast<int>(a) & static_cast<int>(b)); }
+  enum B { };
+  inline constexpr B
+  f(B a, B b)			// { dg-error "C function" }
+  { return B(static_cast<int>(a) & static_cast<int>(b)); }
+}
+

gcc/testsuite/g++.dg/parse/friend5.C

@@ -4,5 +4,4 @@ extern "C" struct A
 {
   friend void foo(int) {} // { dg-error "declaration" }
   friend void foo() {} // { dg-error "foo" "err" }
-  // { dg-warning "already a friend" "warn" { target *-*-* } 6 }
 };