Don't treat array as builtin type in set_underlying_type

2016-09-13  Jason Merrill  <jason@redhat.com>
	    Tom de Vries  <tom@codesourcery.com>

	PR c++/77427
	* c-common.c (set_underlying_type): Don't treat array as builtin type.

	* g++.dg/pr77427.C: New test.

Co-Authored-By: Tom de Vries <tom@codesourcery.com>

From-SVN: r240112

gcc/c-family/ChangeLog

 2016-09-13  Jason Merrill  <jason@redhat.com>
+	    Tom de Vries  <tom@codesourcery.com>
+
+	PR c++/77427
+	* c-common.c (set_underlying_type): Don't treat array as builtin type.
+
+2016-09-13  Jason Merrill  <jason@redhat.com>
 
 	* c-common.c (check_cxx_fundamental_alignment_constraints): Don't
 	limit types at all.

gcc/c-family/c-common.c

@@ -12298,7 +12298,7 @@ set_underlying_type (tree x)
 {
   if (x == error_mark_node)
     return;
-  if (DECL_IS_BUILTIN (x))
+  if (DECL_IS_BUILTIN (x) && TREE_CODE (TREE_TYPE (x)) != ARRAY_TYPE)
     {
       if (TYPE_NAME (TREE_TYPE (x)) == 0)
 	TYPE_NAME (TREE_TYPE (x)) = x;

gcc/testsuite/ChangeLog

+2016-09-13  Jason Merrill  <jason@redhat.com>
+	    Tom de Vries  <tom@codesourcery.com>
+
+	PR c++/77427
+	* g++.dg/pr77427.C: New test.
+
 2016-09-13  Martin Liska  <mliska@suse.cz>
 
 	* g++.dg/gcov/gcov-threads-1.C: Use profile_update_atomic

gcc/testsuite/g++.dg/pr77427.C

+// { dg-do compile }
+
+void bar (__builtin_va_list &);
+
+struct c
+{
+  operator const __builtin_va_list &();
+  operator __builtin_va_list &();
+};
+
+void
+foo (void)
+{
+  struct c c1;
+
+  bar (c1);
+}