[syslinux:master] Makefile: error out if the core has undefined symbols

[syslinux-bot for H. Peter Anvin]

Commit-ID:  bd91041bff259cf4303fa6bbb0b6bce33fa7c1e8
Gitweb:     http://www.syslinux.org/commit/bd91041bff259cf4303fa6bbb0b6bce33fa7c1e8
Author:     H. Peter Anvin <hpa at zytor.com>
AuthorDate: Tue, 1 Mar 2016 21:06:02 -0800
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Tue, 1 Mar 2016 21:06:02 -0800

Makefile: error out if the core has undefined symbols

--unresolved-symbols=report-all apparently doesn't report the case
where a symbol is requested but never referenced.  Error out if
necessary.

Signed-off-by: H. Peter Anvin <hpa at zytor.com>

---
 core/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/core/Makefile b/core/Makefile
index b87007f..46cb037 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -162,6 +162,8 @@ NASM_ELF = elf
 		-E --hash-style=gnu -M -o $@ $< \
 		--start-group $(LIBS) $(subst $(*F).elf,lib$(*F).a,$@) --end-group \
 		> $(@:.elf=.map)
+	if [ `$(NM) -D -u $@ | wc -l` -ne 0 ]; then \
+		$(NM) -D -u $@ 1>&2; rm -f $@; false; fi
 	$(OBJDUMP) -h $@ > $(@:.elf=.sec)
 	$(PERL) $(SRC)/lstadjust.pl $(@:.elf=.lsr) $(@:.elf=.sec) $(@:.elf=.lst)