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d6fc9fcb MY |
1 | # SPDX-License-Identifier: GPL-2.0-only |
2 | ||
3 | # Unlike the kernel space, exported headers are written in standard C. | |
4 | # - Forbid C++ style comments | |
5 | # - Use '__inline__', '__asm__' instead of 'inline', 'asm' | |
6 | # | |
7 | # -std=c90 (equivalent to -ansi) catches the violation of those. | |
8 | # We cannot go as far as adding -Wpedantic since it emits too many warnings. | |
9 | UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration | |
10 | ||
9371f86e MY |
11 | # In theory, we do not care -m32 or -m64 for header compile tests. |
12 | # It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64. | |
13 | UAPI_CFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS)) | |
14 | ||
30a77297 | 15 | override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I$(objtree)/usr/include |
d6fc9fcb MY |
16 | |
17 | # The following are excluded for now because they fail to build. | |
18 | # | |
19 | # Do not add a new header to the blacklist without legitimate reason. | |
20 | # Please consider to fix the header first. | |
21 | # | |
22 | # Sorted alphabetically. | |
0186b126 MY |
23 | no-header-test += asm/ucontext.h |
24 | no-header-test += drm/vmwgfx_drm.h | |
25 | no-header-test += linux/am437x-vpfe.h | |
0186b126 | 26 | no-header-test += linux/coda.h |
d1ad2721 | 27 | no-header-test += linux/cyclades.h |
0186b126 | 28 | no-header-test += linux/errqueue.h |
0186b126 MY |
29 | no-header-test += linux/hdlc/ioctl.h |
30 | no-header-test += linux/ivtv.h | |
0186b126 | 31 | no-header-test += linux/matroxfb.h |
0186b126 MY |
32 | no-header-test += linux/omap3isp.h |
33 | no-header-test += linux/omapfb.h | |
34 | no-header-test += linux/patchkey.h | |
35 | no-header-test += linux/phonet.h | |
0186b126 | 36 | no-header-test += linux/sctp.h |
0186b126 MY |
37 | no-header-test += linux/sysctl.h |
38 | no-header-test += linux/usb/audio.h | |
39 | no-header-test += linux/v4l2-mediabus.h | |
40 | no-header-test += linux/v4l2-subdev.h | |
41 | no-header-test += linux/videodev2.h | |
42 | no-header-test += linux/vm_sockets.h | |
43 | no-header-test += sound/asequencer.h | |
44 | no-header-test += sound/asoc.h | |
45 | no-header-test += sound/asound.h | |
46 | no-header-test += sound/compress_offload.h | |
47 | no-header-test += sound/emu10k1.h | |
48 | no-header-test += sound/sfnt_info.h | |
49 | no-header-test += xen/evtchn.h | |
50 | no-header-test += xen/gntdev.h | |
51 | no-header-test += xen/privcmd.h | |
d6fc9fcb MY |
52 | |
53 | # More headers are broken in some architectures | |
54 | ||
55 | ifeq ($(SRCARCH),arc) | |
0186b126 | 56 | no-header-test += linux/bpf_perf_event.h |
d6fc9fcb MY |
57 | endif |
58 | ||
59 | ifeq ($(SRCARCH),ia64) | |
0186b126 MY |
60 | no-header-test += asm/setup.h |
61 | no-header-test += asm/sigcontext.h | |
0186b126 | 62 | no-header-test += linux/if_bonding.h |
d6fc9fcb MY |
63 | endif |
64 | ||
65 | ifeq ($(SRCARCH),mips) | |
0186b126 | 66 | no-header-test += asm/stat.h |
d6fc9fcb MY |
67 | endif |
68 | ||
69 | ifeq ($(SRCARCH),powerpc) | |
0186b126 MY |
70 | no-header-test += asm/stat.h |
71 | no-header-test += linux/bpf_perf_event.h | |
d6fc9fcb MY |
72 | endif |
73 | ||
74 | ifeq ($(SRCARCH),riscv) | |
0186b126 | 75 | no-header-test += linux/bpf_perf_event.h |
d6fc9fcb MY |
76 | endif |
77 | ||
d6fc9fcb | 78 | ifeq ($(SRCARCH),sparc) |
0186b126 MY |
79 | no-header-test += asm/stat.h |
80 | no-header-test += asm/uctx.h | |
81 | no-header-test += asm/fbio.h | |
d6fc9fcb MY |
82 | endif |
83 | ||
84 | # asm-generic/*.h is used by asm/*.h, and should not be included directly | |
0186b126 | 85 | no-header-test += asm-generic/% |
d6fc9fcb | 86 | |
cf6b58ab | 87 | extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null)) |
fcbb8461 | 88 | |
00d76a0c | 89 | # Include the header twice to detect missing include guard. |
fcbb8461 | 90 | quiet_cmd_hdrtest = HDRTEST $< |
7ecaf069 MY |
91 | cmd_hdrtest = \ |
92 | $(CC) $(c_flags) -S -o /dev/null -x c /dev/null \ | |
0186b126 | 93 | $(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \ |
50a48340 | 94 | $(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<; \ |
7ecaf069 | 95 | touch $@ |
fcbb8461 MY |
96 | |
97 | $(obj)/%.hdrtest: $(obj)/%.h FORCE | |
98 | $(call if_changed_dep,hdrtest) | |
d6fc9fcb | 99 | |
50a48340 MY |
100 | # Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works. |
101 | # To support older Make versions, use a somewhat tedious way. | |
102 | clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*))) |