mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
09bd7c75e5
One of the most remarkable improvements in this cycle is, Kbuild is
now able to cache the result of shell commands. Some variables are
expensive to compute, for example, $(call cc-option,...) invokes the
compiler. It is not efficient to redo this computation every time,
even when we are not actually building anything. Kbuild creates a
hidden file ".cache.mk" that contains invoked shell commands and
their results. The speed-up should be noticeable.
Summary:
- Fix arch build issues (hexagon, sh)
- Clean up various Makefiles and scripts
- Fix wrong usage of {CFLAGS,LDFLAGS}_MODULE in arch Makefiles
- Cache variables that are expensive to compute
- Improve cc-ldopton and ld-option for Clang
- Optimize output directory creation
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=zIdO
-----END PGP SIGNATURE-----
Merge tag 'kbuild-v4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada:
"One of the most remarkable improvements in this cycle is, Kbuild is
now able to cache the result of shell commands. Some variables are
expensive to compute, for example, $(call cc-option,...) invokes the
compiler. It is not efficient to redo this computation every time,
even when we are not actually building anything. Kbuild creates a
hidden file ".cache.mk" that contains invoked shell commands and their
results. The speed-up should be noticeable.
Summary:
- Fix arch build issues (hexagon, sh)
- Clean up various Makefiles and scripts
- Fix wrong usage of {CFLAGS,LDFLAGS}_MODULE in arch Makefiles
- Cache variables that are expensive to compute
- Improve cc-ldopton and ld-option for Clang
- Optimize output directory creation"
* tag 'kbuild-v4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (30 commits)
kbuild: move coccicheck help from scripts/Makefile.help to top Makefile
sh: decompressor: add shipped files to .gitignore
frv: .gitignore: ignore vmlinux.lds
selinux: remove unnecessary assignment to subdir-
kbuild: specify FORCE in Makefile.headersinst as .PHONY target
kbuild: remove redundant mkdir from ./Kbuild
kbuild: optimize object directory creation for incremental build
kbuild: create object directories simpler and faster
kbuild: filter-out PHONY targets from "targets"
kbuild: remove redundant $(wildcard ...) for cmd_files calculation
kbuild: create directory for make cache only when necessary
sh: select KBUILD_DEFCONFIG depending on ARCH
kbuild: fix linker feature test macros when cross compiling with Clang
kbuild: shrink .cache.mk when it exceeds 1000 lines
kbuild: do not call cc-option before KBUILD_CFLAGS initialization
kbuild: Cache a few more calls to the compiler
kbuild: Add a cache for generated variables
kbuild: add forward declaration of default target to Makefile.asm-generic
kbuild: remove KBUILD_SUBDIR_ASFLAGS and KBUILD_SUBDIR_CCFLAGS
hexagon/kbuild: replace CFLAGS_MODULE with KBUILD_CFLAGS_MODULE
...
131 lines
4.0 KiB
Makefile
131 lines
4.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
# ==========================================================================
|
|
# Installing headers
|
|
#
|
|
# All headers under include/uapi, include/generated/uapi,
|
|
# arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
|
|
# exported.
|
|
# They are preprocessed to remove __KERNEL__ section of the file.
|
|
#
|
|
# ==========================================================================
|
|
|
|
PHONY := __headers
|
|
__headers:
|
|
|
|
include scripts/Kbuild.include
|
|
|
|
srcdir := $(srctree)/$(obj)
|
|
|
|
# When make is run under a fakechroot environment, the function
|
|
# $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular
|
|
# files. So, we are using a combination of sort/dir/wildcard which works
|
|
# with fakechroot.
|
|
subdirs := $(patsubst $(srcdir)/%/,%,\
|
|
$(filter-out $(srcdir)/,\
|
|
$(sort $(dir $(wildcard $(srcdir)/*/)))))
|
|
|
|
# Recursion
|
|
__headers: $(subdirs)
|
|
|
|
PHONY += $(subdirs)
|
|
$(subdirs):
|
|
$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@
|
|
|
|
# Skip header install/check for include/uapi and arch/$(SRCARCH)/include/uapi.
|
|
# We have only sub-directories there.
|
|
skip-inst := $(if $(filter %/uapi,$(obj)),1)
|
|
|
|
ifeq ($(skip-inst),)
|
|
|
|
# Kbuild file is optional
|
|
kbuild-file := $(srctree)/$(obj)/Kbuild
|
|
-include $(kbuild-file)
|
|
|
|
installdir := $(INSTALL_HDR_PATH)/$(dst)
|
|
gendir := $(objtree)/$(subst include/,include/generated/,$(obj))
|
|
header-files := $(notdir $(wildcard $(srcdir)/*.h))
|
|
header-files += $(notdir $(wildcard $(srcdir)/*.agh))
|
|
header-files := $(filter-out $(no-export-headers), $(header-files))
|
|
genhdr-files := $(notdir $(wildcard $(gendir)/*.h))
|
|
genhdr-files := $(filter-out $(header-files), $(genhdr-files))
|
|
|
|
# files used to track state of install/check
|
|
install-file := $(installdir)/.install
|
|
check-file := $(installdir)/.check
|
|
|
|
# all headers files for this dir
|
|
all-files := $(header-files) $(genhdr-files)
|
|
output-files := $(addprefix $(installdir)/, $(all-files))
|
|
|
|
ifneq ($(mandatory-y),)
|
|
missing := $(filter-out $(all-files),$(mandatory-y))
|
|
ifneq ($(missing),)
|
|
$(error Some mandatory headers ($(missing)) are missing in $(obj))
|
|
endif
|
|
endif
|
|
|
|
# Work out what needs to be removed
|
|
oldheaders := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
|
|
unwanted := $(filter-out $(all-files),$(oldheaders))
|
|
|
|
# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
|
|
unwanted-file := $(addprefix $(installdir)/, $(unwanted))
|
|
|
|
printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
|
|
|
|
quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
|
|
file$(if $(word 2, $(all-files)),s))
|
|
cmd_install = \
|
|
$(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
|
|
$(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
|
|
touch $@
|
|
|
|
quiet_cmd_remove = REMOVE $(unwanted)
|
|
cmd_remove = rm -f $(unwanted-file)
|
|
|
|
quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files)
|
|
# Headers list can be pretty long, xargs helps to avoid
|
|
# the "Argument list too long" error.
|
|
cmd_check = for f in $(all-files); do \
|
|
echo "$(installdir)/$${f}"; done \
|
|
| xargs \
|
|
$(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
|
|
touch $@
|
|
|
|
ifndef HDRCHECK
|
|
# Rules for installing headers
|
|
__headers: $(install-file)
|
|
@:
|
|
|
|
targets += $(install-file)
|
|
$(install-file): scripts/headers_install.sh \
|
|
$(addprefix $(srcdir)/,$(header-files)) \
|
|
$(addprefix $(gendir)/,$(genhdr-files)) FORCE
|
|
$(if $(unwanted),$(call cmd,remove),)
|
|
$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
|
|
$(call if_changed,install)
|
|
|
|
else
|
|
__headers: $(check-file)
|
|
@:
|
|
|
|
targets += $(check-file)
|
|
$(check-file): scripts/headers_check.pl $(output-files) FORCE
|
|
$(call if_changed,check)
|
|
|
|
endif
|
|
|
|
cmd_files := $(wildcard \
|
|
$(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
|
|
|
|
ifneq ($(cmd_files),)
|
|
include $(cmd_files)
|
|
endif
|
|
|
|
endif # skip-inst
|
|
|
|
PHONY += FORCE
|
|
FORCE: ;
|
|
|
|
.PHONY: $(PHONY)
|