projects/linux·blob v6.13 · refs

89 lines · 3.0 KiB

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.
9UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration
10
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.
13UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
14
15# USERCFLAGS might contain sysroot location for CC.
16UAPI_CFLAGS += $(USERCFLAGS)
17
18override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include
19
20# The following are excluded for now because they fail to build.
21#
22# Do not add a new header to the blacklist without legitimate reason.
23# Please consider to fix the header first.
24#
25# Sorted alphabetically.
26no-header-test += asm/ucontext.h
27no-header-test += drm/vmwgfx_drm.h
28no-header-test += linux/am437x-vpfe.h
29no-header-test += linux/coda.h
30no-header-test += linux/cyclades.h
31no-header-test += linux/errqueue.h
32no-header-test += linux/hdlc/ioctl.h
33no-header-test += linux/ivtv.h
34no-header-test += linux/matroxfb.h
35no-header-test += linux/omap3isp.h
36no-header-test += linux/omapfb.h
37no-header-test += linux/patchkey.h
38no-header-test += linux/phonet.h
39no-header-test += linux/sctp.h
40no-header-test += linux/sysctl.h
41no-header-test += linux/usb/audio.h
42no-header-test += linux/v4l2-mediabus.h
43no-header-test += linux/v4l2-subdev.h
44no-header-test += linux/videodev2.h
45no-header-test += linux/vm_sockets.h
46no-header-test += sound/asequencer.h
47no-header-test += sound/asoc.h
48no-header-test += sound/asound.h
49no-header-test += sound/compress_offload.h
50no-header-test += sound/emu10k1.h
51no-header-test += sound/sfnt_info.h
52no-header-test += xen/evtchn.h
53no-header-test += xen/gntdev.h
54no-header-test += xen/privcmd.h
55
56# More headers are broken in some architectures
57
58ifeq ($(SRCARCH),arc)
59no-header-test += linux/bpf_perf_event.h
60endif
61
62ifeq ($(SRCARCH),powerpc)
63no-header-test += linux/bpf_perf_event.h
64endif
65
66ifeq ($(SRCARCH),sparc)
67no-header-test += asm/uctx.h
68no-header-test += asm/fbio.h
69endif
70
71# asm-generic/*.h is used by asm/*.h, and should not be included directly
72no-header-test += asm-generic/%
73
74always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
75
76# Include the header twice to detect missing include guard.
77quiet_cmd_hdrtest = HDRTEST $<
78 cmd_hdrtest = \
79 $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
80 $(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
81 $(PERL) $(src)/headers_check.pl $(obj) $<; \
82 touch $@
83
84$(obj)/%.hdrtest: $(obj)/%.h FORCE
85 $(call if_changed_dep,hdrtest)
86
87# Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
88# To support older Make versions, use a somewhat tedious way.
89clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))