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 11override c_flags = $(UAPI_CFLAGS) -Wp,-MD,$(depfile) -I$(objtree)/usr/include 12 13# The following are excluded for now because they fail to build. 14# 15# Do not add a new header to the blacklist without legitimate reason. 16# Please consider to fix the header first. 17# 18# Sorted alphabetically. 19header-test- += asm/shmbuf.h 20header-test- += asm/signal.h 21header-test- += asm/ucontext.h 22header-test- += drm/vmwgfx_drm.h 23header-test- += linux/am437x-vpfe.h 24header-test- += linux/android/binder.h 25header-test- += linux/android/binderfs.h 26header-test- += linux/coda.h 27header-test- += linux/elfcore.h 28header-test- += linux/errqueue.h 29header-test- += linux/fsmap.h 30header-test- += linux/hdlc/ioctl.h 31header-test- += linux/ivtv.h 32header-test- += linux/kexec.h 33header-test- += linux/matroxfb.h 34header-test- += linux/nfc.h 35header-test- += linux/omap3isp.h 36header-test- += linux/omapfb.h 37header-test- += linux/patchkey.h 38header-test- += linux/phonet.h 39header-test- += linux/reiserfs_xattr.h 40header-test- += linux/sctp.h 41header-test- += linux/signal.h 42header-test- += linux/sysctl.h 43header-test- += linux/usb/audio.h 44header-test- += linux/v4l2-mediabus.h 45header-test- += linux/v4l2-subdev.h 46header-test- += linux/videodev2.h 47header-test- += linux/vm_sockets.h 48header-test- += sound/asequencer.h 49header-test- += sound/asoc.h 50header-test- += sound/asound.h 51header-test- += sound/compress_offload.h 52header-test- += sound/emu10k1.h 53header-test- += sound/sfnt_info.h 54header-test- += xen/evtchn.h 55header-test- += xen/gntdev.h 56header-test- += xen/privcmd.h 57 58# More headers are broken in some architectures 59 60ifeq ($(SRCARCH),arc) 61header-test- += linux/bpf_perf_event.h 62endif 63 64ifeq ($(SRCARCH),ia64) 65header-test- += asm/setup.h 66header-test- += asm/sigcontext.h 67header-test- += asm/perfmon.h 68header-test- += asm/perfmon_default_smpl.h 69header-test- += linux/if_bonding.h 70endif 71 72ifeq ($(SRCARCH),mips) 73header-test- += asm/stat.h 74endif 75 76ifeq ($(SRCARCH),powerpc) 77header-test- += asm/stat.h 78header-test- += linux/bpf_perf_event.h 79endif 80 81ifeq ($(SRCARCH),riscv) 82header-test- += linux/bpf_perf_event.h 83endif 84 85ifeq ($(SRCARCH),sparc) 86header-test- += asm/stat.h 87header-test- += asm/uctx.h 88header-test- += asm/fbio.h 89endif 90 91# asm-generic/*.h is used by asm/*.h, and should not be included directly 92header-test- += asm-generic/% 93 94extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null)) 95 96quiet_cmd_hdrtest = HDRTEST $< 97 cmd_hdrtest = \ 98 $(CC) $(c_flags) -S -o /dev/null -x c /dev/null \ 99 $(if $(filter-out $(header-test-), $*.h), -include $<); \ 100 $(PERL) $(srctree)/scripts/headers_check.pl $(obj) $(SRCARCH) $<; \ 101 touch $@ 102 103$(obj)/%.hdrtest: $(obj)/%.h FORCE 104 $(call if_changed_dep,hdrtest) 105 106clean-files += $(filter-out Makefile, $(notdir $(wildcard $(obj)/*))) 107