Messages in this thread Patch in this message | | | From | Olof Johansson <> | Subject | [PATCH] objtool: Be lenient about -Wundef | Date | Wed, 19 Jun 2019 05:03:37 -0700 |
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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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