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9371f86ecb
bpfilter_umh is built for the default machine bit of the compiler, which may not match to the bit size of the kernel. This happens in the scenario below: You can use biarch GCC that defaults to 64-bit for building the 32-bit kernel. In this case, Kbuild passes -m32 to teach the compiler to produce 32-bit kernel space objects. However, it is missing when building bpfilter_umh. It is built as a 64-bit ELF, and then embedded into the 32-bit kernel. The 32-bit kernel and 64-bit umh is a bad combination. In theory, we can have 32-bit umh running on 64-bit kernel, but we do not have a good reason to support such a usecase. The best is to match the bit size between them. Pass -m32 or -m64 to the umh build command if it is found in $(KBUILD_CFLAGS). Evaluate CC_CAN_LINK against the kernel bit-size. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
112 lines
3.5 KiB
Makefile
112 lines
3.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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# Unlike the kernel space, exported headers are written in standard C.
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# - Forbid C++ style comments
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# - Use '__inline__', '__asm__' instead of 'inline', 'asm'
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#
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# -std=c90 (equivalent to -ansi) catches the violation of those.
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# We cannot go as far as adding -Wpedantic since it emits too many warnings.
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UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration
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# In theory, we do not care -m32 or -m64 for header compile tests.
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# It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
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UAPI_CFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
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override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I$(objtree)/usr/include
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# The following are excluded for now because they fail to build.
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#
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# Do not add a new header to the blacklist without legitimate reason.
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# Please consider to fix the header first.
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#
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# Sorted alphabetically.
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no-header-test += asm/shmbuf.h
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no-header-test += asm/signal.h
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no-header-test += asm/ucontext.h
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no-header-test += drm/vmwgfx_drm.h
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no-header-test += linux/am437x-vpfe.h
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no-header-test += linux/android/binder.h
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no-header-test += linux/android/binderfs.h
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no-header-test += linux/coda.h
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no-header-test += linux/elfcore.h
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no-header-test += linux/errqueue.h
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no-header-test += linux/fsmap.h
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no-header-test += linux/hdlc/ioctl.h
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no-header-test += linux/ivtv.h
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no-header-test += linux/kexec.h
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no-header-test += linux/matroxfb.h
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no-header-test += linux/nfc.h
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no-header-test += linux/omap3isp.h
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no-header-test += linux/omapfb.h
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no-header-test += linux/patchkey.h
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no-header-test += linux/phonet.h
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no-header-test += linux/reiserfs_xattr.h
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no-header-test += linux/sctp.h
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no-header-test += linux/signal.h
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no-header-test += linux/sysctl.h
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no-header-test += linux/usb/audio.h
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no-header-test += linux/v4l2-mediabus.h
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no-header-test += linux/v4l2-subdev.h
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no-header-test += linux/videodev2.h
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no-header-test += linux/vm_sockets.h
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no-header-test += sound/asequencer.h
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no-header-test += sound/asoc.h
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no-header-test += sound/asound.h
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no-header-test += sound/compress_offload.h
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no-header-test += sound/emu10k1.h
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no-header-test += sound/sfnt_info.h
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no-header-test += xen/evtchn.h
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no-header-test += xen/gntdev.h
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no-header-test += xen/privcmd.h
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# More headers are broken in some architectures
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ifeq ($(SRCARCH),arc)
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no-header-test += linux/bpf_perf_event.h
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endif
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ifeq ($(SRCARCH),ia64)
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no-header-test += asm/setup.h
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no-header-test += asm/sigcontext.h
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no-header-test += asm/perfmon.h
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no-header-test += asm/perfmon_default_smpl.h
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no-header-test += linux/if_bonding.h
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endif
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ifeq ($(SRCARCH),mips)
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no-header-test += asm/stat.h
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endif
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ifeq ($(SRCARCH),powerpc)
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no-header-test += asm/stat.h
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no-header-test += linux/bpf_perf_event.h
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endif
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ifeq ($(SRCARCH),riscv)
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no-header-test += linux/bpf_perf_event.h
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endif
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ifeq ($(SRCARCH),sparc)
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no-header-test += asm/stat.h
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no-header-test += asm/uctx.h
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no-header-test += asm/fbio.h
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endif
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# asm-generic/*.h is used by asm/*.h, and should not be included directly
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no-header-test += asm-generic/%
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extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
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# Include the header twice to detect missing include guard.
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quiet_cmd_hdrtest = HDRTEST $<
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cmd_hdrtest = \
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$(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
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$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
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$(PERL) $(srctree)/scripts/headers_check.pl $(obj) $(SRCARCH) $<; \
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touch $@
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$(obj)/%.hdrtest: $(obj)/%.h FORCE
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$(call if_changed_dep,hdrtest)
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clean-files += $(filter-out Makefile, $(notdir $(wildcard $(obj)/*)))
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