with GCC4 we *need* to pass -fno-unit-at-a-time otherwise GCC

reorders things breaking _init() and _fini().

for i386, the {init,fini}_fallthru() functions were being output
_before_ the _init()/ _fini(), and instead of falling through to
the rest of the .init/.fini section, it would fall through to
_init()/_fini() again, and again, and again, until the stack was
exhausted.

now i386 works, but i have not checked that this works for
sparc64 as well.

lib/csu/common_elf/Makefile.inc

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile.inc,v 1.25 2004/08/28 00:18:38 thorpej Exp $
+#	$NetBSD: Makefile.inc,v 1.26 2006/05/13 01:40:34 mrg Exp $
 
 .include <bsd.own.mk>
 
@@ -16,6 +16,10 @@ CPPFLAGS+=	-DDWARF2_EH
 CPPFLAGS+=	-DJCR
 CPPFLAGS+=	-DDSO_HANDLE
 
+.if ${HAVE_GCC} > 3
+CFLAGS+=	-fno-unit-at-a-time
+.endif
+
 .PATH:		${.CURDIR}/../common_elf
 
 SRCS+=		crt0.c crti.c crtn.c