* top.h (lim_at_start): Declare.

[deliverable/binutils-gdb.git] / gdb / top.c

diff --git a/gdb/top.c b/gdb/top.c
index fea71dfd87f21b5cca27e2cf8d397791f322f1fd..24410c4f53a873045c212afec8b53e676cc6655e 100644 (file)
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -171,6 +171,11 @@ int target_executing = 0;
 /* Level of control structure.  */
 static int control_level;
 
+/* Sbrk location on entry to main.  Used for statistics only.  */
+#ifdef HAVE_SBRK
+char *lim_at_start;
+#endif
+
 /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT.  */
 
 #ifndef STOP_SIGNAL
@@ -782,10 +787,8 @@ command_loop (void)
       if (display_space)
        {
 #ifdef HAVE_SBRK
-         extern char **environ;
          char *lim = (char *) sbrk (0);
-
-         space_at_cmd_start = (long) (lim - (char *) &environ);
+         space_at_cmd_start = lim - lim_at_start;
 #endif
        }
 
@@ -805,9 +808,8 @@ command_loop (void)
       if (display_space)
        {
 #ifdef HAVE_SBRK
-         extern char **environ;
          char *lim = (char *) sbrk (0);
-         long space_now = lim - (char *) &environ;
+         long space_now = lim - lim_at_start;
          long space_diff = space_now - space_at_cmd_start;
 
          printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",