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2a0a30805a
The header tests try to compile each header. Some UAPI headers depend on libc headers so they need a full userspace toolchain to build. This dependency is expressed in kconfig as a dependency on CC_CAN_LINK. Many kernel builds do not satisfy CC_CAN_LINK as they only use a minimal kernel (cross-) compiler. In those configurations the UAPI headers are not tested at all. However most UAPI headers do not even depend on any libc headers, and such dependencies are undesired in any case. Also the static analysis performed by headers_check.pl does not need CC_CAN_LINK. Drop the hard dependency on CC_CAN_LINK and instead skip the affected compilation step for exactly those headers which require libc. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Link: https://patch.msgid.link/20251223-uapi-nostdinc-v1-5-d91545d794f7@linutronix.de Signed-off-by: Nathan Chancellor <nathan@kernel.org>
172 lines
5.3 KiB
Makefile
172 lines
5.3 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 -Werror=implicit-function-declaration
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override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-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/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/coda.h
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no-header-test += linux/cyclades.h
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no-header-test += linux/errqueue.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/matroxfb.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/sctp.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 ($(SRCARCH),openrisc)
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no-header-test += linux/bpf_perf_event.h
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endif
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ifeq ($(SRCARCH),powerpc)
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no-header-test += linux/bpf_perf_event.h
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endif
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ifeq ($(SRCARCH),sparc)
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no-header-test += asm/uctx.h
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no-header-test += asm/fbio.h
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endif
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ifeq ($(SRCARCH),xtensa)
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no-header-test += linux/bpf_perf_event.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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# The following are using libc header and types.
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#
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# Do not add a new header to the list 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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uses-libc += linux/a.out.h
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uses-libc += linux/atmbr2684.h
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uses-libc += linux/auto_dev-ioctl.h
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uses-libc += linux/auto_fs.h
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uses-libc += linux/auto_fs4.h
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uses-libc += linux/btrfs_tree.h
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uses-libc += linux/cec-funcs.h
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uses-libc += linux/cec.h
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uses-libc += linux/dvb/dmx.h
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uses-libc += linux/dvb/video.h
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uses-libc += linux/ethtool.h
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uses-libc += linux/ethtool_netlink.h
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uses-libc += linux/fuse.h
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uses-libc += linux/gsmmux.h
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uses-libc += linux/icmp.h
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uses-libc += linux/idxd.h
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uses-libc += linux/if.h
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uses-libc += linux/if_arp.h
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uses-libc += linux/if_bonding.h
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uses-libc += linux/if_pppox.h
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uses-libc += linux/if_tunnel.h
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uses-libc += linux/input.h
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uses-libc += linux/ip6_tunnel.h
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uses-libc += linux/joystick.h
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uses-libc += linux/llc.h
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uses-libc += linux/mctp.h
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uses-libc += linux/mdio.h
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uses-libc += linux/mii.h
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uses-libc += linux/mptcp.h
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uses-libc += linux/netdevice.h
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uses-libc += linux/netfilter/xt_RATEEST.h
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uses-libc += linux/netfilter/xt_hashlimit.h
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uses-libc += linux/netfilter/xt_physdev.h
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uses-libc += linux/netfilter/xt_rateest.h
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uses-libc += linux/netfilter_arp/arp_tables.h
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uses-libc += linux/netfilter_arp/arpt_mangle.h
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uses-libc += linux/netfilter_bridge.h
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uses-libc += linux/netfilter_bridge/ebtables.h
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uses-libc += linux/netfilter_ipv4.h
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uses-libc += linux/netfilter_ipv4/ip_tables.h
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uses-libc += linux/netfilter_ipv6.h
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uses-libc += linux/netfilter_ipv6/ip6_tables.h
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uses-libc += linux/route.h
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uses-libc += linux/shm.h
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uses-libc += linux/soundcard.h
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uses-libc += linux/string.h
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uses-libc += linux/tipc_config.h
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uses-libc += linux/uhid.h
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uses-libc += linux/uinput.h
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uses-libc += linux/vhost.h
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uses-libc += linux/vhost_types.h
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uses-libc += linux/virtio_ring.h
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uses-libc += linux/wireless.h
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uses-libc += regulator/regulator.h
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uses-libc += scsi/fc/fc_els.h
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ifeq ($(SRCARCH),hexagon)
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uses-libc += asm/sigcontext.h
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endif
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ifeq ($(SRCARCH),nios2)
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uses-libc += asm/ptrace.h
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uses-libc += linux/bpf_perf_event.h
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endif
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ifeq ($(SRCARCH),s390)
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uses-libc += asm/chpid.h
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uses-libc += asm/chsc.h
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endif
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always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
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target-no-libc = $(filter-out $(uses-libc), $*.h)
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target-can-compile = $(and $(filter-out $(no-header-test), $*.h), \
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$(or $(CONFIG_CC_CAN_LINK), $(target-no-libc)))
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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) $(c_flags) -fsyntax-only -Werror -x c /dev/null \
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$(if $(target-no-libc), -nostdinc) \
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$(if $(target-can-compile), -include $< -include $<); \
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$(PERL) $(src)/headers_check.pl $(obj) $<; \
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touch $@
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$(obj)/%.hdrtest: $(obj)/%.h $(src)/headers_check.pl FORCE
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$(call if_changed_dep,hdrtest)
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# Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
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# To support older Make versions, use a somewhat tedious way.
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clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))
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