ELF versions of __warn_references() and __weak_reference(). Note that this

doesn't work with libc/net/res_stubs.c since gas wants the weak reference
to take place in the same context as the real definition, presumably so
that it can get hold of the symbol typing etc.
However, this doesn't matter for libc/elf since we don't have binaries
that use the old symbol names.

sys/sys/cdefs.h

@@ -1,4 +1,3 @@
-
 /*
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
@@ -35,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)cdefs.h	8.8 (Berkeley) 1/9/95
- * $Id: cdefs.h,v 1.16 1998/05/28 18:04:34 dt Exp $
+ * $Id: cdefs.h,v 1.17 1998/06/14 13:40:01 bde Exp $
  */
 
 #ifndef	_SYS_CDEFS_H_
@@ -144,6 +143,25 @@
 #endif
 
 #ifdef __GNUC__
+#ifdef __ELF__
+#ifdef __STDC__
+#define	__weak_reference(sym,alias)	\
+	__asm__(".weak " #alias);	\
+	__asm__(".set "  #alias ", " #sym)
+#define	__warn_references(sym,msg)	\
+	__asm__(".section .gnu.warning." #sym);	\
+	__asm__(".ascii \"" msg "\"");	\
+	__asm__(".previous")
+#else
+#define	__weak_reference(sym,alias)	\
+	__asm__(".weak alias");		\
+	__asm__(".set alias, sym")
+#define	__warn_references(sym,msg)	\
+	__asm__(".section .gnu.warning.sym"); \
+	__asm__(".ascii \"msg\"");	\
+	__asm__(".previous")
+#endif	/* __STDC__ */
+#else	/* !__ELF__ */
 #ifdef __STDC__
 #define __weak_reference(sym,alias)	\
 	__asm__(".stabs \"_" #alias "\",11,0,0,0");	\
@@ -158,8 +176,9 @@
 #define __warn_references(sym,msg)	\
 	__asm__(".stabs msg,30,0,0,0");			\
 	__asm__(".stabs \"_/**/sym\",1,0,0,0")
-#endif
-#endif
+#endif	/* __STDC__ */
+#endif	/* __ELF__ */
+#endif	/* __GNUC__ */
 
 #define	__IDSTRING(name,string)	static const char name[] __unused = string