[PATCH, PR c++/58561] dbxout.c and TEMPLATE_TYPE_PARM

[David Edelsohn]

The patch for PR c++/58561 fixed DWARF, but did not fix Stabs
debugging.  The follow patch at least stops G++ from ICE'ing for a
return type of auto.  I'm not sure what type of debugging stabs should
generate, if it can represent it.

Thanks, David

PR c++/58561
* dbxout.c: Include stringpool.h
(dbxout_type) [default]: Ignore auto type.

Index: dbxout.c
===================================================================
--- dbxout.c    (revision 217982)
+++ dbxout.c    (working copy)
@@ -103,6 +103,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "plugin-api.h"
 #include "ipa-ref.h"
 #include "cgraph.h"
+#include "stringpool.h"

 #ifdef XCOFF_DEBUGGING_INFO
 #include "xcoffout.h"
@@ -2329,6 +2330,17 @@ dbxout_type (tree type, int full)
       break;

     default:
+      /* A C++ function with deduced return type can have a TEMPLATE_TYPE_PARM
+        named 'auto' in its type.
+        No debug info for TEMPLATE_TYPE_PARM type supported yet.  */
+      if (lang_GNU_CXX ())
+       {
+         tree name = TYPE_IDENTIFIER (type);
+         if (name == get_identifier ("auto")
+             || name == get_identifier ("decltype(auto)"))
+           break;
+       }
+
       gcc_unreachable ();
     }
 }