mangle.c (write_type): Handle 'auto'.

gcc/cp/
	* mangle.c (write_type): Handle 'auto'.
	* init.c (build_new): Don't do auto deduction where it might
	affect template mangling.
libiberty/
	* cp-demangle.c (cplus_demangle_type): Handle 'auto'.

From-SVN: r185595

gcc/cp/ChangeLog

 2012-03-20  Jason Merrill  <jason@redhat.com>
 
+	* mangle.c (write_type): Handle 'auto'.
+	* init.c (build_new): Don't do auto deduction where it might
+	affect template mangling.
+
 	PR c++/52510
 	* decl.c (reshape_init_class): Handle repeated reshaping.
 	* search.c (lookup_field_1): Add sanity check.

gcc/cp/init.c

@@ -2774,7 +2774,9 @@ build_new (VEC(tree,gc) **placement, tree type, tree nelts,
   if (type == error_mark_node)
     return error_mark_node;
 
-  if (nelts == NULL_TREE && VEC_length (tree, *init) == 1)
+  if (nelts == NULL_TREE && VEC_length (tree, *init) == 1
+      /* Don't do auto deduction where it might affect mangling.  */
+      && (!processing_template_decl || at_function_scope_p ()))
     {
       tree auto_node = type_uses_auto (type);
       if (auto_node)

gcc/cp/mangle.c

@@ -1933,6 +1933,13 @@ write_type (tree type)
 	      break;
 
 	    case TEMPLATE_TYPE_PARM:
+	      if (is_auto (type))
+		{
+		  write_identifier ("Da");
+		  ++is_builtin_type;
+		  break;
+		}
+	      /* else fall through.  */
 	    case TEMPLATE_PARM_INDEX:
 	      write_template_param (type);
 	      break;

gcc/testsuite/ChangeLog

+2012-03-20  Jason Merrill  <jason@redhat.com>
+
+	* g++.dg/cpp0x/auto32.C: New.
+
 2012-03-20  Georg-Johann Lay  <avr@gjlay.de>
 
 	PR testsuite/52641

gcc/testsuite/g++.dg/cpp0x/auto32.C

+// { dg-do compile { target c++11 } }
+
+// { dg-final { scan-assembler "_Z1fIiEDTnw_Dapifp_EET_" } }
+template <class T> auto f(T t) -> decltype (new auto(t));
+
+int main()
+{
+  f(1);
+}

libiberty/ChangeLog

+2012-03-20  Jason Merrill  <jason@redhat.com>
+
+	* cp-demangle.c (cplus_demangle_type): Handle 'auto'.
+
 2012-03-07  Jason Merrill  <jason@redhat.com>
 
 	* cp-demangle.c (cplus_demangle_operators): Add li.

libiberty/cp-demangle.c

@@ -2270,6 +2270,11 @@ cplus_demangle_type (struct d_info *di)
 			     cplus_demangle_type (di), NULL);
 	  can_subst = 1;
 	  break;
+
+	case 'a':
+	  /* auto */
+	  ret = d_make_name (di, "auto", 4);
+	  break;
 	  
 	case 'f':
 	  /* 32-bit decimal floating point */

libiberty/testsuite/demangle-expected

@@ -4075,6 +4075,12 @@ decltype (new int{}) f1<int>(int)
 --format=gnu-v3
 _Zli2_wPKc
 operator"" _w(char const*)
+--format=gnu-v3
+_Z1fIiEDTnw_Dapifp_EET_
+decltype (new auto({parm#1})) f<int>(int)
+--format=gnu-v3
+_Z1fIiERDaRKT_S1_
+auto& f<int>(int const&, int)
 #
 # Ada (GNAT) tests.
 #