xref: /openbmc/linux/usr/include/Makefile (revision 2cf1c348)
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, $(KBUILD_CFLAGS))
14
15override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I$(objtree)/usr/include
16
17# The following are excluded for now because they fail to build.
18#
19# Do not add a new header to the blacklist without legitimate reason.
20# Please consider to fix the header first.
21#
22# Sorted alphabetically.
23no-header-test += asm/shmbuf.h
24no-header-test += asm/signal.h
25no-header-test += asm/ucontext.h
26no-header-test += drm/vmwgfx_drm.h
27no-header-test += linux/am437x-vpfe.h
28no-header-test += linux/android/binder.h
29no-header-test += linux/android/binderfs.h
30no-header-test += linux/coda.h
31no-header-test += linux/errqueue.h
32no-header-test += linux/fsmap.h
33no-header-test += linux/hdlc/ioctl.h
34no-header-test += linux/ivtv.h
35no-header-test += linux/kexec.h
36no-header-test += linux/matroxfb.h
37no-header-test += linux/omap3isp.h
38no-header-test += linux/omapfb.h
39no-header-test += linux/patchkey.h
40no-header-test += linux/phonet.h
41no-header-test += linux/reiserfs_xattr.h
42no-header-test += linux/sctp.h
43no-header-test += linux/signal.h
44no-header-test += linux/sysctl.h
45no-header-test += linux/usb/audio.h
46no-header-test += linux/v4l2-mediabus.h
47no-header-test += linux/v4l2-subdev.h
48no-header-test += linux/videodev2.h
49no-header-test += linux/vm_sockets.h
50no-header-test += sound/asequencer.h
51no-header-test += sound/asoc.h
52no-header-test += sound/asound.h
53no-header-test += sound/compress_offload.h
54no-header-test += sound/emu10k1.h
55no-header-test += sound/sfnt_info.h
56no-header-test += xen/evtchn.h
57no-header-test += xen/gntdev.h
58no-header-test += xen/privcmd.h
59
60# More headers are broken in some architectures
61
62ifeq ($(SRCARCH),arc)
63no-header-test += linux/bpf_perf_event.h
64endif
65
66ifeq ($(SRCARCH),ia64)
67no-header-test += asm/setup.h
68no-header-test += asm/sigcontext.h
69no-header-test += linux/if_bonding.h
70endif
71
72ifeq ($(SRCARCH),mips)
73no-header-test += asm/stat.h
74endif
75
76ifeq ($(SRCARCH),powerpc)
77no-header-test += asm/stat.h
78no-header-test += linux/bpf_perf_event.h
79endif
80
81ifeq ($(SRCARCH),riscv)
82no-header-test += linux/bpf_perf_event.h
83endif
84
85ifeq ($(SRCARCH),sparc)
86no-header-test += asm/stat.h
87no-header-test += asm/uctx.h
88no-header-test += asm/fbio.h
89endif
90
91# asm-generic/*.h is used by asm/*.h, and should not be included directly
92no-header-test += asm-generic/%
93
94extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
95
96# Include the header twice to detect missing include guard.
97quiet_cmd_hdrtest = HDRTEST $<
98      cmd_hdrtest = \
99		$(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
100			$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
101		$(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<; \
102		touch $@
103
104$(obj)/%.hdrtest: $(obj)/%.h FORCE
105	$(call if_changed_dep,hdrtest)
106
107# Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
108# To support older Make versions, use a somewhat tedious way.
109clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))
110