1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 2
3 # Unlike the kernel space, exported headers ar 3 # Unlike the kernel space, exported headers are written in standard C.
4 # - Forbid C++ style comments 4 # - Forbid C++ style comments
5 # - Use '__inline__', '__asm__' instead of 'i 5 # - Use '__inline__', '__asm__' instead of 'inline', 'asm'
6 # 6 #
7 # -std=c90 (equivalent to -ansi) catches the v 7 # -std=c90 (equivalent to -ansi) catches the violation of those.
8 # We cannot go as far as adding -Wpedantic sin 8 # We cannot go as far as adding -Wpedantic since it emits too many warnings.
9 UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit 9 UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration
10 10
11 # In theory, we do not care -m32 or -m64 for h 11 # In theory, we do not care -m32 or -m64 for header compile tests.
12 # It is here just because CONFIG_CC_CAN_LINK i 12 # It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
13 UAPI_CFLAGS += $(filter -m32 -m64 --target=%, 13 UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
14 14
15 # USERCFLAGS might contain sysroot location fo 15 # USERCFLAGS might contain sysroot location for CC.
16 UAPI_CFLAGS += $(USERCFLAGS) 16 UAPI_CFLAGS += $(USERCFLAGS)
17 17
18 override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(d 18 override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include
19 19
20 # The following are excluded for now because t 20 # The following are excluded for now because they fail to build.
21 # 21 #
22 # Do not add a new header to the blacklist wit 22 # Do not add a new header to the blacklist without legitimate reason.
23 # Please consider to fix the header first. 23 # Please consider to fix the header first.
24 # 24 #
25 # Sorted alphabetically. 25 # Sorted alphabetically.
26 no-header-test += asm/ucontext.h 26 no-header-test += asm/ucontext.h
27 no-header-test += drm/vmwgfx_drm.h 27 no-header-test += drm/vmwgfx_drm.h
28 no-header-test += linux/am437x-vpfe.h 28 no-header-test += linux/am437x-vpfe.h
29 no-header-test += linux/coda.h 29 no-header-test += linux/coda.h
30 no-header-test += linux/cyclades.h 30 no-header-test += linux/cyclades.h
31 no-header-test += linux/errqueue.h 31 no-header-test += linux/errqueue.h
32 no-header-test += linux/hdlc/ioctl.h 32 no-header-test += linux/hdlc/ioctl.h
33 no-header-test += linux/ivtv.h 33 no-header-test += linux/ivtv.h
34 no-header-test += linux/matroxfb.h 34 no-header-test += linux/matroxfb.h
35 no-header-test += linux/omap3isp.h 35 no-header-test += linux/omap3isp.h
36 no-header-test += linux/omapfb.h 36 no-header-test += linux/omapfb.h
37 no-header-test += linux/patchkey.h 37 no-header-test += linux/patchkey.h
38 no-header-test += linux/phonet.h 38 no-header-test += linux/phonet.h
39 no-header-test += linux/sctp.h 39 no-header-test += linux/sctp.h
40 no-header-test += linux/sysctl.h 40 no-header-test += linux/sysctl.h
41 no-header-test += linux/usb/audio.h 41 no-header-test += linux/usb/audio.h
42 no-header-test += linux/v4l2-mediabus.h 42 no-header-test += linux/v4l2-mediabus.h
43 no-header-test += linux/v4l2-subdev.h 43 no-header-test += linux/v4l2-subdev.h
44 no-header-test += linux/videodev2.h 44 no-header-test += linux/videodev2.h
45 no-header-test += linux/vm_sockets.h 45 no-header-test += linux/vm_sockets.h
46 no-header-test += sound/asequencer.h 46 no-header-test += sound/asequencer.h
47 no-header-test += sound/asoc.h 47 no-header-test += sound/asoc.h
48 no-header-test += sound/asound.h 48 no-header-test += sound/asound.h
49 no-header-test += sound/compress_offload.h 49 no-header-test += sound/compress_offload.h
50 no-header-test += sound/emu10k1.h 50 no-header-test += sound/emu10k1.h
51 no-header-test += sound/sfnt_info.h 51 no-header-test += sound/sfnt_info.h
52 no-header-test += xen/evtchn.h 52 no-header-test += xen/evtchn.h
53 no-header-test += xen/gntdev.h 53 no-header-test += xen/gntdev.h
54 no-header-test += xen/privcmd.h 54 no-header-test += xen/privcmd.h
55 55
56 # More headers are broken in some architecture 56 # More headers are broken in some architectures
57 57
58 ifeq ($(SRCARCH),arc) 58 ifeq ($(SRCARCH),arc)
59 no-header-test += linux/bpf_perf_event.h 59 no-header-test += linux/bpf_perf_event.h
60 endif 60 endif
61 61
62 ifeq ($(SRCARCH),powerpc) 62 ifeq ($(SRCARCH),powerpc)
63 no-header-test += linux/bpf_perf_event.h 63 no-header-test += linux/bpf_perf_event.h
64 endif 64 endif
65 65
66 ifeq ($(SRCARCH),sparc) 66 ifeq ($(SRCARCH),sparc)
67 no-header-test += asm/uctx.h 67 no-header-test += asm/uctx.h
68 no-header-test += asm/fbio.h 68 no-header-test += asm/fbio.h
69 endif 69 endif
70 70
71 # asm-generic/*.h is used by asm/*.h, and shou 71 # asm-generic/*.h is used by asm/*.h, and should not be included directly
72 no-header-test += asm-generic/% 72 no-header-test += asm-generic/%
73 73
74 always-y := $(patsubst $(obj)/%.h,%.hdrtest, $ 74 always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
75 75
76 # Include the header twice to detect missing i 76 # Include the header twice to detect missing include guard.
77 quiet_cmd_hdrtest = HDRTEST $< 77 quiet_cmd_hdrtest = HDRTEST $<
78 cmd_hdrtest = \ 78 cmd_hdrtest = \
79 $(CC) $(c_flags) -fsyntax-only 79 $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
80 $(if $(filter-out $(no 80 $(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
81 $(PERL) $(src)/headers_check.p 81 $(PERL) $(src)/headers_check.pl $(obj) $(SRCARCH) $<; \
82 touch $@ 82 touch $@
83 83
84 $(obj)/%.hdrtest: $(obj)/%.h FORCE 84 $(obj)/%.hdrtest: $(obj)/%.h FORCE
85 $(call if_changed_dep,hdrtest) 85 $(call if_changed_dep,hdrtest)
86 86
87 # Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$ 87 # Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
88 # To support older Make versions, use a somewh 88 # To support older Make versions, use a somewhat tedious way.
89 clean-files += $(filter-out Makefile headers_c 89 clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))
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