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Subject[PATCH] objtool: Be lenient about -Wundef
Date
Some libelf versions use undefined macros, which combined with newer GCC
makes for errors from system headers. This isn't overly useful to fail
compiling objtool for.

Error as seen:

cc1: all warnings being treated as errors
In file included from arch/x86/../../elf.h:10,
from arch/x86/decode.c:14:
/usr/include/libelf/gelf.h:25:5: error: "__LIBELF_INTERNAL__" is not defined, evaluates to 0 [-Werror=undef]
#if __LIBELF_INTERNAL__
^~~~~~~~~~~~~~~~~~~

For this reason, skip -Wundef on objtool.

Signed-off-by: Olof Johansson <olof@lixom.net>
---
tools/objtool/Makefile | 2 ++
1 file changed, 2 insertions(+)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 88158239622bc..0c49206c5216b 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -35,6 +35,8 @@ INCLUDES := -I$(srctree)/tools/include \
-I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
-I$(srctree)/tools/objtool/arch/$(ARCH)/include
WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
+# Some system libelf versions uses undefined "#if <var>", so skip the warning/error
+WARNINGS += -Wno-undef
CFLAGS += -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
LDFLAGS += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)

--
2.11.0
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