b8321ed4a4
- Add new environment variables, USERCFLAGS and USERLDFLAGS to allow
additional flags to be passed to user-space programs.
- Fix missing fflush() bugs in Kconfig and fixdep
- Fix a minor bug in the comment format of the .config file
- Make kallsyms ignore llvm's local labels, .L*
- Fix UAPI compile-test for cross-compiling with Clang
- Extend the LLVM= syntax to support LLVM=<suffix> form for using a
particular version of LLVm, and LLVM=<prefix> form for using custom
LLVM in a particular directory path.
- Clean up Makefiles
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Merge tag 'kbuild-v5.18-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada:
- Add new environment variables, USERCFLAGS and USERLDFLAGS to allow
additional flags to be passed to user-space programs.
- Fix missing fflush() bugs in Kconfig and fixdep
- Fix a minor bug in the comment format of the .config file
- Make kallsyms ignore llvm's local labels, .L*
- Fix UAPI compile-test for cross-compiling with Clang
- Extend the LLVM= syntax to support LLVM=<suffix> form for using a
particular version of LLVm, and LLVM=<prefix> form for using custom
LLVM in a particular directory path.
- Clean up Makefiles
* tag 'kbuild-v5.18-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kbuild: Make $(LLVM) more flexible
kbuild: add --target to correctly cross-compile UAPI headers with Clang
fixdep: use fflush() and ferror() to ensure successful write to files
arch: syscalls: simplify uapi/kapi directory creation
usr/include: replace extra-y with always-y
certs: simplify empty certs creation in certs/Makefile
certs: include certs/signing_key.x509 unconditionally
kallsyms: ignore all local labels prefixed by '.L'
kconfig: fix missing '# end of' for empty menu
kconfig: add fflush() before ferror() check
kbuild: replace $(if A,A,B) with $(or A,B)
kbuild: Add environment variables for userprogs flags
kbuild: unify cmd_copy and cmd_shipped
3.3 KiB
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_CFLAGS))
USERCFLAGS might contain sysroot location for CC.
UAPI_CFLAGS += $(USERCFLAGS)
override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I$(objtree)/usr/include
The following are excluded for now because they fail to build.
Do not add a new header to the blacklist without legitimate reason.
Please consider to fix the header first.
Sorted alphabetically.
no-header-test += asm/ucontext.h no-header-test += drm/vmwgfx_drm.h no-header-test += linux/am437x-vpfe.h no-header-test += linux/coda.h no-header-test += linux/cyclades.h no-header-test += linux/errqueue.h no-header-test += linux/hdlc/ioctl.h no-header-test += linux/ivtv.h no-header-test += linux/matroxfb.h no-header-test += linux/omap3isp.h no-header-test += linux/omapfb.h no-header-test += linux/patchkey.h no-header-test += linux/phonet.h no-header-test += linux/sctp.h no-header-test += linux/sysctl.h no-header-test += linux/usb/audio.h no-header-test += linux/v4l2-mediabus.h no-header-test += linux/v4l2-subdev.h no-header-test += linux/videodev2.h no-header-test += linux/vm_sockets.h no-header-test += sound/asequencer.h no-header-test += sound/asoc.h no-header-test += sound/asound.h no-header-test += sound/compress_offload.h no-header-test += sound/emu10k1.h no-header-test += sound/sfnt_info.h no-header-test += xen/evtchn.h no-header-test += xen/gntdev.h no-header-test += xen/privcmd.h
More headers are broken in some architectures
ifeq ($(SRCARCH),arc) no-header-test += linux/bpf_perf_event.h endif
ifeq ($(SRCARCH),ia64) no-header-test += asm/setup.h no-header-test += asm/sigcontext.h no-header-test += linux/if_bonding.h endif
ifeq ($(SRCARCH),mips) no-header-test += asm/stat.h endif
ifeq ($(SRCARCH),powerpc) no-header-test += asm/stat.h no-header-test += linux/bpf_perf_event.h endif
ifeq ($(SRCARCH),riscv) no-header-test += linux/bpf_perf_event.h endif
ifeq ($(SRCARCH),sparc) no-header-test += asm/stat.h no-header-test += asm/uctx.h no-header-test += asm/fbio.h endif
asm-generic/.h is used by asm/.h, and should not be included directly
no-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) -S -o /dev/null -x c /dev/null
$(if $(filter-out $(no-header-test), $*.h), -include $< -include $<);
$(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<;
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)/*)))