From: Russell King <rmk+lkml@arm.linux.org.uk>

The only issue with this is that, when a problem is detected, the
reported symbols will also include the Sparc64 register symbols.

Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 25-akpm/Makefile |    8 ++++++++
 1 files changed, 8 insertions(+)

diff -puN Makefile~handle-undefined-symbols Makefile
--- 25/Makefile~handle-undefined-symbols	2004-07-11 22:00:46.803427192 -0700
+++ 25-akpm/Makefile	2004-07-11 22:00:46.807426584 -0700
@@ -535,6 +535,8 @@ endef
 
 #	set -e makes the rule exit immediately on error
 
+#	Note: Ensure that there are no undefined symbols in the final
+#	linked image.  Not doing this can lead to silent link failures.
 define rule_vmlinux__
 	+set -e;							\
 	$(if $(filter .tmp_kallsyms%,$^),,				\
@@ -546,6 +548,12 @@ define rule_vmlinux__
 	$(if $($(quiet)cmd_vmlinux__),					\
 	  echo '  $($(quiet)cmd_vmlinux__)' &&) 			\
 	$(cmd_vmlinux__);						\
+	if $(OBJDUMP) --syms $@ | egrep -q '^([^R]|R[^E]|RE[^G])[^w]*\*UND\*'; then	\
+		echo 'ldchk: $@: final image has undefined symbols:';	\
+		$(NM) $@ | sed 's/^ *U \(.*\)/  \1/p;d';		\
+		$(RM) -f $@;						\
+		exit 1;							\
+	fi;								\
 	echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
 endef
 
_