linux-kernel - [PATCH] objtool: Link with -lz

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Date:   Mon, 24 Sep 2018 09:18:21 +0000
From:   "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] objtool: Link with -lz

This should fix the following when statically linking host tools:
gcc .../tools/objtool/objtool-in.o  -lelf .../tools/objtool/libsubcmd.a  -static -o .../tools/objtool/objtool
.../bin/ld: .../sys-root/lib/libelf.a(elf_compress.o): in function `__libelf_compress':
.../libelf/elf_compress.c:113: undefined reference to `deflateInit_'

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
---
 tools/objtool/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index c9d038f..d1847e3 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -32,7 +32,7 @@ INCLUDES := -I$(srctree)/tools/include \
 	    -I$(srctree)/tools/objtool/arch/$(ARCH)/include
 WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
 CFLAGS   += -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES)
-LDFLAGS  += -lelf $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
+LDFLAGS  += -lelf -lz $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
 
 # Allow old libelf to be used:
 elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr)
-- 
2.4.6