* top.h (lim_at_start): Declare.

        * main.c (captured_main): Set it.
        * top.c (lim_at_start): Define.
        (command_loop): Use it instead of &environ.
        * event-top.c (command_handler): Likewise.

        * gdb.base/selftest.exp: Next over lim_at_start initialization.

1 files changed, 4 insertions, 0 deletions

diff --git a/gdb/main.c b/gdb/main.c
index fd25750..240aa00 100644
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -168,6 +168,10 @@ captured_main (void *data)
   /* This needs to happen before the first use of malloc.  */
   init_malloc (NULL);
 
+#ifdef HAVE_SBRK
+  lim_at_start = (char *) sbrk (0);
+#endif
+
 #if defined (ALIGN_STACK_ON_STARTUP)
   i = (int) &count & 0x3;
   if (i != 0)