Avoid -Werror=format-overflow error in dbxout.c (dbxout_block) on 64-bit Solaris/SPARC

	* dbxout.c (dbxout_block): Grow buf to 30 bytes.

From-SVN: r255406

gcc/ChangeLog

+2017-12-05  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* dbxout.c (dbxout_block): Grow buf to 30 bytes.
+
 2017-12-05  Martin Liska  <mliska@suse.cz>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/dbxout.c

@@ -3844,7 +3844,7 @@ dbxout_block (tree block, int depth, tree args, int parent_blocknum)
 	      /* If we emitted any vars and didn't output any LBRAC/RBRAC,
 		 either at this level or any lower level, we need to emit
 		 an empty LBRAC/RBRAC pair now.  */
-	      char buf[20];
+	      char buf[30];
 	      const char *scope_start;
 
 	      ret = true;