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

present.

[_LIBC] (start_of_data): Use weak ref to __data_start; use &etext if not
present.
6c6b28ea · Roland McGrath · c8e9dd54 · 6c6b28ea
Commit 6c6b28ea authored Nov 16, 1995 by Roland McGrath
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Showing with 4 additions and 3 deletions

src/mem-limits.h src/mem-limits.h +4 -3

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--- 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 */