From: Roland McGrath <roland@gnu.org>
Date: Thu, 16 Nov 1995 01:46:10 +0000 (+0000)
Subject: [_LIBC] (start_of_data): Use weak ref to __data_start; use &etext if not
X-Git-Tag: emacs-19.34~2297
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=6c6b28ea7f9fa815972f6308ab3cbb336516fecb;p=emacs.git

[_LIBC] (start_of_data): Use weak ref to __data_start; use &etext if not
present.
---

diff --git a/src/mem-limits.h b/src/mem-limits.h
index e814de10f0d..c63e0b48399 100644
--- a/src/mem-limits.h
+++ b/src/mem-limits.h
@@ -29,8 +29,9 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #include <sys/resource.h>
 #define BSD4_2			/* Tell code below to use getrlimit.  */
 
-extern int __data_start;
-#define start_of_data()	&__data_start
+/* Old Linux startup code won't define __data_start.  */
+extern int __data_start; weak_symbol (__data_start)
+#define start_of_data()	(&__data_start ?: &etext)
 
 #else /* not _LIBC */
 
@@ -88,7 +89,7 @@ extern char etext;
 #endif
 #endif
 
-#else  /* not emacs */ 
+#else  /* not emacs */
 extern char etext;
 #define start_of_data() &etext
 #endif /* not emacs */