usr/include/Makefile

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