(gdb) down
#0  strlen () at ../sysdeps/x86_64/strlen.S:106
106	../sysdeps/x86_64/strlen.S: No such file or directory.
(gdb) list
101	in ../sysdeps/x86_64/strlen.S
(gdb) up
#1  0x00007fb6aad36f9e in __GI___strdup (s=0x0) at strdup.c:41
41	strdup.c: No such file or directory.
(gdb) list
36	in strdup.c
(gdb) up
#2  0x0000000000417b19 in xstrdup (ptr=ptr@entry=0x0) at misc.c:259
259	  result = strdup (ptr);
(gdb) list
254	xstrdup (const char *ptr)
255	{
256	  char *result;
257
258	#ifdef HAVE_STRDUP
259	  result = strdup (ptr);
260	#else
261	  result = malloc (strlen (ptr) + 1);
262	#endif
263
(gdb) up
#3  0x000000000042274c in define_variable_in_set (name=name@entry=0x428d65 "MAKE_TERMOUT", length=length@entry=12, value=0x0, origin=origin@entry=o_default, recursive=recursive@entry=0,
    set=set@entry=0x634040 <global_variable_set>, flocp=flocp@entry=0x0) at variable.c:243
243	  v->value = xstrdup (value);
(gdb) list
238
239	  v = xmalloc (sizeof (struct variable));
240	  v->name = xstrndup (name, length);
241	  v->length = length;
242	  hash_insert_at (&set->table, v, var_slot);
243	  v->value = xstrdup (value);
244	  if (flocp != 0)
245	    v->fileinfo = *flocp;
246	  else
247	    v->fileinfo.filenm = 0;
(gdb) up
#4  0x0000000000406ac0 in main (argc=<optimized out>, argv=<optimized out>, envp=0x7fffee1ea7d8) at main.c:1404
1404	        define_variable_cname ("MAKE_TERMOUT", TTYNAME (fileno (stdout)),
(gdb) list
1399
1400	    /* Set a variable specifying whether stdout/stdin is hooked to a TTY.  */
1401	#ifdef HAVE_ISATTY
1402	    if (isatty (fileno (stdout)))
1403	      if (! lookup_variable (STRING_SIZE_TUPLE ("MAKE_TERMOUT")))
1404	        define_variable_cname ("MAKE_TERMOUT", TTYNAME (fileno (stdout)),
1405	                               o_default, 0)->export = v_export;
1406
1407	    if (isatty (fileno (stderr)))
1408	      if (! lookup_variable (STRING_SIZE_TUPLE ("MAKE_TERMERR")))