2486baae2c
Currently BUILD_BUG() macro is expanded to smth like the following:
do {
extern void __compiletime_assert_0(void)
__attribute__((error("BUILD_BUG failed")));
if (!(!(1)))
__compiletime_assert_0();
} while (0);
If used in a function body this obviously would produce build errors
with -Wnested-externs and -Werror.
Build objtool with -Wno-nested-externs to enable BUILD_BUG() usage.
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
2.2 KiB
SPDX-License-Identifier: GPL-2.0
include ../scripts/Makefile.include include ../scripts/Makefile.arch
always use the host compiler
ifneq ($(LLVM),) HOSTAR ?= llvm-ar HOSTCC ?= clang HOSTLD ?= ld.lld else HOSTAR ?= ar HOSTCC ?= gcc HOSTLD ?= ld endif AR = $(HOSTAR) CC = $(HOSTCC) LD = $(HOSTLD)
ifeq ($(srctree),) srctree := $(patsubst %/,%,$(dir $(CURDIR))) srctree := $(patsubst %/,%,$(dir $(srctree))) endif
SUBCMD_SRCDIR = $(srctree)/tools/lib/subcmd/ LIBSUBCMD_OUTPUT = $(if $(OUTPUT),$(OUTPUT),$(CURDIR)/) LIBSUBCMD = $(LIBSUBCMD_OUTPUT)libsubcmd.a
OBJTOOL := $(OUTPUT)objtool OBJTOOL_IN := $(OBJTOOL)-in.o
LIBELF_FLAGS := $(shell pkg-config libelf --cflags 2>/dev/null) LIBELF_LIBS := $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
all: $(OBJTOOL)
INCLUDES := -I$(srctree)/tools/include
-I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi
-I$(srctree)/tools/arch/$(SRCARCH)/include
-I$(srctree)/tools/objtool/arch/$(SRCARCH)/include
WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs
CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
LDFLAGS += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
Allow old libelf to be used:
elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr) CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
AWK = awk
SUBCMD_CHECK := n SUBCMD_ORC := n
ifeq ($(SRCARCH),x86) SUBCMD_CHECK := y SUBCMD_ORC := y endif
ifeq ($(SUBCMD_ORC),y) CFLAGS += -DINSN_USE_ORC endif
export SUBCMD_CHECK SUBCMD_ORC export srctree OUTPUT CFLAGS SRCARCH AWK include $(srctree)/tools/build/Makefile.include
$(OBJTOOL_IN): fixdep FORCE @$(CONFIG_SHELL) ./sync-check.sh @$(MAKE) $(build)=objtool
$(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN) $(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@
$(LIBSUBCMD): fixdep FORCE $(Q)$(MAKE) -C $(SUBCMD_SRCDIR) OUTPUT=$(LIBSUBCMD_OUTPUT)
clean: $(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL) $(Q)find $(OUTPUT) -name '.o' -delete -o -name '..cmd' -delete -o -name '.*.d' -delete $(Q)$(RM) $(OUTPUT)arch/x86/inat-tables.c $(OUTPUT)fixdep
FORCE:
.PHONY: clean FORCE