LXR linux/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.
   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_CPPFLAGS) $(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 ($(SRCARCH),openrisc)
  63no-header-test += linux/bpf_perf_event.h
  64endif
  65
  66ifeq ($(SRCARCH),powerpc)
  67no-header-test += linux/bpf_perf_event.h
  68endif
  69
  70ifeq ($(SRCARCH),sparc)
  71no-header-test += asm/uctx.h
  72no-header-test += asm/fbio.h
  73endif
  74
  75# asm-generic/*.h is used by asm/*.h, and should not be included directly
  76no-header-test += asm-generic/%
  77
  78always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
  79
  80# Include the header twice to detect missing include guard.
  81quiet_cmd_hdrtest = HDRTEST $<
  82      cmd_hdrtest = \
  83                $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
  84                        $(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
  85                $(PERL) $(src)/headers_check.pl $(obj) $<; \
  86                touch $@
  87
  88$(obj)/%.hdrtest: $(obj)/%.h FORCE
  89        $(call if_changed_dep,hdrtest)
  90
  91# Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
  92# To support older Make versions, use a somewhat tedious way.
  93clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))
  94