# SPDX-License-Identifier: GPL-2.0-only # Unlike the kernel space, exported headers are written in standard C.#  - Forbid C++ style comments#  - Use '__inline__', '__asm__' instead of 'inline', 'asm'## -std=c90 (equivalent to -ansi) catches the violation of those.# We cannot go as far as adding -Wpedantic since it emits too many warnings.UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration # In theory, we do not care -m32 or -m64 for header compile tests.# It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) # USERCFLAGS might contain sysroot location for CC.UAPI_CFLAGS += $(USERCFLAGS) override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include # The following are excluded for now because they fail to build.## Do not add a new header to the blacklist without legitimate reason.# Please consider to fix the header first.## Sorted alphabetically.no-header-test += asm/ucontext.hno-header-test += drm/vmwgfx_drm.hno-header-test += linux/am437x-vpfe.hno-header-test += linux/coda.hno-header-test += linux/cyclades.hno-header-test += linux/errqueue.hno-header-test += linux/hdlc/ioctl.hno-header-test += linux/ivtv.hno-header-test += linux/matroxfb.hno-header-test += linux/omap3isp.hno-header-test += linux/omapfb.hno-header-test += linux/patchkey.hno-header-test += linux/phonet.hno-header-test += linux/sctp.hno-header-test += linux/sysctl.hno-header-test += linux/usb/audio.hno-header-test += linux/v4l2-mediabus.hno-header-test += linux/v4l2-subdev.hno-header-test += linux/videodev2.hno-header-test += linux/vm_sockets.hno-header-test += sound/asequencer.hno-header-test += sound/asoc.hno-header-test += sound/asound.hno-header-test += sound/compress_offload.hno-header-test += sound/emu10k1.hno-header-test += sound/sfnt_info.hno-header-test += xen/evtchn.hno-header-test += xen/gntdev.hno-header-test += xen/privcmd.h # More headers are broken in some architectures ifeq ($(SRCARCH),arc)no-header-test += linux/bpf_perf_event.hendif ifeq ($(SRCARCH),powerpc)no-header-test += linux/bpf_perf_event.hendif ifeq ($(SRCARCH),sparc)no-header-test += asm/uctx.hno-header-test += asm/fbio.hendif # asm-generic/*.h is used by asm/*.h, and should not be included directlyno-header-test += asm-generic/% always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null)) # Include the header twice to detect missing include guard.quiet_cmd_hdrtest = HDRTEST $<      cmd_hdrtest = \		$(CC) $(c_flags) -fsyntax-only -x c /dev/null \			$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \		$(PERL) $(src)/headers_check.pl $(obj) $<; \		touch $@ $(obj)/%.hdrtest: $(obj)/%.h FORCE	$(call if_changed_dep,hdrtest) # Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.# To support older Make versions, use a somewhat tedious way.clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))