[PATCH] c++: ICE with unexpanded pack in asm

[yxj-github-437]

Here an unexpanded parameter pack pass into asm_operand which doesn't
expect to see an operand without type. So use check_for_bare_parameter_packs
to remedy that.

gcc/cp/ChangeLog:

        * parse.cc (cp_parser_asm_operand_list): Check for unexpanded
        parameter packs.

gcc/testsuite/ChangeLog:

        * g++.dg/cpp0x/variadic-crash7.C: New test.
---
 gcc/cp/parser.cc                             |  3 +++
 gcc/testsuite/g++.dg/cpp0x/variadic-crash7.C | 12 ++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/cpp0x/variadic-crash7.C

diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 86337635f48..cf379088ec4 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -30421,6 +30421,9 @@ cp_parser_asm_operand_list (cp_parser* parser)
       parens.require_open (parser);
       /* Parse the expression.  */
       tree expression = cp_parser_expression (parser);
+      if (check_for_bare_parameter_packs (expression))
+           expression = error_mark_node;
+
       /* Look for the `)'.  */
       parens.require_close (parser);
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/variadic-crash7.C 
b/gcc/testsuite/g++.dg/cpp0x/variadic-crash7.C
new file mode 100644
index 00000000000..b416508160e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/variadic-crash7.C
@@ -0,0 +1,12 @@
+// { dg-do compile { target c++11 } }
+
+template <typename... Ts>
+void f (Ts&&... args)
+{
+  asm volatile ("" :: "r"(args) : "memory"); // { dg-error "parameter packs" }
+}
+
+void g()
+{
+  f(1);
+}
-- 
2.43.0