Using .mri in assembly

[Alan Modra <amodra@gmail.com>]

Changing mri mode between macro definition and use isn't good.  This
	.macro x
	.endm
	.mri 1
	x
leads to a segfault.  Fixed with the following patch, but I suppose
what should really happen is that macros be marked as being mri mode
when defined, and that determine whether the magic NARG parameter be
supplied at expansion.  Nobody has complained about this in 30 years
so I'm not inclined to change gas behaviour to that extent.

	* macro.c (macro_expand): Don't segfault in mri mode if NARG
	formal isn't found.

diff --git a/gas/macro.c b/gas/macro.c
index afcd48b3a88..74a1317cb11 100644
--- a/gas/macro.c
+++ b/gas/macro.c
@@ -1221,13 +1221,14 @@ macro_expand (size_t idx, sb *in, macro_entry *m, sb *out)
 
       if (macro_mri)
 	{
-	  char buffer[20];
-
-	  sb_reset (&t);
-	  sb_add_string (&t, macro_strip_at ? "$NARG" : "NARG");
-	  ptr = str_hash_find (m->formal_hash, sb_terminate (&t));
-	  sprintf (buffer, "%d", narg);
-	  sb_add_string (&ptr->actual, buffer);
+	  ptr = str_hash_find (m->formal_hash,
+			       macro_strip_at ? "$NARG" : "NARG");
+	  if (ptr)
+	    {
+	      char buffer[20];
+	      sprintf (buffer, "%d", narg);
+	      sb_add_string (&ptr->actual, buffer);
+	    }
 	}
 
       err = macro_expand_body (&m->sub, out, m->formals, m->formal_hash, m);

-- 
Alan Modra
Australia Development Lab, IBM