projects/linux·blob master · refs

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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 -Werror=implicit-function-declaration
10UAPI_ARCH := $(or $(HEADER_ARCH),$(SRCARCH))
11
12override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile)
13cxx_flags = $(filter-out -Wmissing-prototypes -Wstrict-prototypes -std=%, $(KBUILD_USERCFLAGS)) -std=c++98
14
15# The following are excluded for now because they fail to build.
16#
17# Do not add a new header to the blacklist without legitimate reason.
18# Please consider to fix the header first.
19#
20# Sorted alphabetically.
21no-header-test += asm/ucontext.h
22no-header-test += drm/vmwgfx_drm.h
23no-header-test += linux/am437x-vpfe.h
24no-header-test += linux/coda.h
25no-header-test += linux/cyclades.h
26no-header-test += linux/errqueue.h
27no-header-test += linux/hdlc/ioctl.h
28no-header-test += linux/ivtv.h
29no-header-test += linux/matroxfb.h
30no-header-test += linux/omap3isp.h
31no-header-test += linux/omapfb.h
32no-header-test += linux/patchkey.h
33no-header-test += linux/phonet.h
34no-header-test += linux/sctp.h
35no-header-test += linux/sysctl.h
36no-header-test += linux/usb/audio.h
37no-header-test += linux/v4l2-mediabus.h
38no-header-test += linux/v4l2-subdev.h
39no-header-test += linux/videodev2.h
40no-header-test += linux/vm_sockets.h
41no-header-test += sound/asequencer.h
42no-header-test += sound/asoc.h
43no-header-test += sound/asound.h
44no-header-test += sound/compress_offload.h
45no-header-test += sound/emu10k1.h
46no-header-test += sound/sfnt_info.h
47no-header-test += xen/evtchn.h
48no-header-test += xen/gntdev.h
49no-header-test += xen/privcmd.h
50
51# More headers are broken in some architectures
52
53ifneq ($(filter arc openrisc xtensa nios2, $(UAPI_ARCH)),)
54no-header-test += linux/bpf_perf_event.h
55endif
56
57ifeq ($(UAPI_ARCH),sparc)
58no-header-test += asm/uctx.h
59no-header-test += asm/fbio.h
60endif
61
62# asm-generic/*.h is used by asm/*.h, and should not be included directly
63no-header-test += asm-generic/%
64
65# The following are not compatible with C++.
66#
67# Do not add a new header to the list without legitimate reason.
68# Please consider to fix the header first.
69#
70# Sorted alphabetically.
71no-header-test-cxx += linux/auto_dev-ioctl.h
72no-header-test-cxx += linux/map_to_14segment.h
73no-header-test-cxx += linux/map_to_7segment.h
74no-header-test-cxx += linux/netfilter/xt_sctp.h
75no-header-test-cxx += linux/target_core_user.h
76no-header-test-cxx += linux/vhost.h
77no-header-test-cxx += linux/vhost_types.h
78no-header-test-cxx += linux/virtio_net.h
79no-header-test-cxx += linux/virtio_ring.h
80no-header-test-cxx += scsi/fc/fc_els.h
81
82ifeq ($(UAPI_ARCH),x86)
83no-header-test-cxx += asm/elf.h
84endif
85
86# The following are using libc header and types.
87#
88# Do not add a new header to the list without legitimate reason.
89# Please consider to fix the header first.
90#
91# Sorted alphabetically.
92uses-libc += linux/a.out.h
93uses-libc += linux/atmbr2684.h
94uses-libc += linux/auto_dev-ioctl.h
95uses-libc += linux/auto_fs.h
96uses-libc += linux/auto_fs4.h
97uses-libc += linux/btrfs_tree.h
98uses-libc += linux/cec-funcs.h
99uses-libc += linux/cec.h
100uses-libc += linux/dvb/dmx.h
101uses-libc += linux/dvb/video.h
102uses-libc += linux/ethtool.h
103uses-libc += linux/ethtool_netlink.h
104uses-libc += linux/fuse.h
105uses-libc += linux/gsmmux.h
106uses-libc += linux/icmp.h
107uses-libc += linux/idxd.h
108uses-libc += linux/if.h
109uses-libc += linux/if_arp.h
110uses-libc += linux/if_bonding.h
111uses-libc += linux/if_pppox.h
112uses-libc += linux/if_tunnel.h
113uses-libc += linux/input.h
114uses-libc += linux/ip6_tunnel.h
115uses-libc += linux/joystick.h
116uses-libc += linux/llc.h
117uses-libc += linux/mctp.h
118uses-libc += linux/mdio.h
119uses-libc += linux/mii.h
120uses-libc += linux/mptcp.h
121uses-libc += linux/netdevice.h
122uses-libc += linux/netfilter/xt_RATEEST.h
123uses-libc += linux/netfilter/xt_hashlimit.h
124uses-libc += linux/netfilter/xt_physdev.h
125uses-libc += linux/netfilter/xt_rateest.h
126uses-libc += linux/netfilter_arp/arp_tables.h
127uses-libc += linux/netfilter_arp/arpt_mangle.h
128uses-libc += linux/netfilter_bridge.h
129uses-libc += linux/netfilter_bridge/ebtables.h
130uses-libc += linux/netfilter_ipv4.h
131uses-libc += linux/netfilter_ipv4/ip_tables.h
132uses-libc += linux/netfilter_ipv6.h
133uses-libc += linux/netfilter_ipv6/ip6_tables.h
134uses-libc += linux/route.h
135uses-libc += linux/shm.h
136uses-libc += linux/soundcard.h
137uses-libc += linux/string.h
138uses-libc += linux/tipc_config.h
139uses-libc += linux/uhid.h
140uses-libc += linux/uinput.h
141uses-libc += linux/vhost.h
142uses-libc += linux/vhost_types.h
143uses-libc += linux/virtio_ring.h
144uses-libc += linux/wireless.h
145uses-libc += regulator/regulator.h
146uses-libc += scsi/fc/fc_els.h
147
148ifeq ($(UAPI_ARCH),hexagon)
149uses-libc += asm/sigcontext.h
150endif
151
152ifeq ($(UAPI_ARCH),nios2)
153uses-libc += asm/ptrace.h
154endif
155
156ifeq ($(UAPI_ARCH),s390)
157uses-libc += asm/chpid.h
158uses-libc += asm/chsc.h
159endif
160
161always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
162
163# $(cc-option) forces '-x c' which breaks '-x c++' detection.
164cc-can-compile-cxx := $(call try-run,$(CC) $(CLANG_FLAGS) -c -x c++ /dev/null -o "$$TMP", 1)
165
166target-libc = $(filter $(uses-libc), $*.h)
167target-can-compile = $(filter-out $(no-header-test), $*.h)
168target-can-compile-cxx = $(and $(cc-can-compile-cxx), $(target-can-compile), $(filter-out $(no-header-test-cxx), $*.h))
169
170hdrtest-flags = -fsyntax-only -Werror \
171 -nostdinc -I $(obj) $(if $(target-libc), -I $(srctree)/usr/dummy-include)
172
173# Include the header twice to detect missing include guard.
174quiet_cmd_hdrtest = HDRTEST $<
175 cmd_hdrtest = \
176 $(CC) $(c_flags) $(hdrtest-flags) -x c /dev/null \
177 $(if $(target-can-compile), -include $< -include $<); \
178 $(if $(target-can-compile-cxx), \
179 $(CC) $(cxx_flags) $(hdrtest-flags) -x c++ /dev/null -include $<;) \
180 $(PERL) $(src)/headers_check.pl $(obj) $<; \
181 touch $@
182
183$(obj)/%.hdrtest: $(obj)/%.h $(src)/headers_check.pl FORCE
184 $(call if_changed_dep,hdrtest)
185
186# Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
187# To support older Make versions, use a somewhat tedious way.
188clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))