# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
+$(if $(filter __%, $(MAKECMDGOALS)), \
+ $(error targets prefixed with '__' are only for internal use))
+
# That's our default target when none is given on the command line
-PHONY := _all
-_all:
+PHONY := __all
+__all:
# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
need-sub-make := 1
endif
+this-makefile := $(lastword $(MAKEFILE_LIST))
+
ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
need-sub-make := 1
# Cancel implicit rules for this Makefile.
-$(lastword $(MAKEFILE_LIST)): ;
+$(this-makefile): ;
endif
export abs_srctree abs_objtree
ifeq ($(need-sub-make),1)
-PHONY += $(MAKECMDGOALS) sub-make
+PHONY += $(MAKECMDGOALS) __sub-make
-$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
+$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
@:
# Invoke a second make in the output directory, passing relevant variables
-sub-make:
+__sub-make:
$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
endif # need-sub-make
KBUILD_EXTMOD := $(M)
endif
+$(if $(word 2, $(KBUILD_EXTMOD)), \
+ $(error building multiple external modules is not supported))
+
export KBUILD_CHECKSRC KBUILD_EXTMOD
extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
PHONY += $(MAKECMDGOALS) __build_one_by_one
-$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
+$(MAKECMDGOALS): __build_one_by_one
@:
__build_one_by_one:
HOSTCC = gcc
HOSTCXX = g++
endif
-KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
- -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
- $(HOSTCFLAGS)
+
+export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
+ -O2 -fomit-frame-pointer -std=gnu89
+export KBUILD_USERLDFLAGS :=
+
+KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
PYTHON3 = python3
CHECK = sparse
BASH = bash
+GZIP = gzip
+BZIP2 = bzip2
+LZOP = lzop
+LZMA = lzma
+LZ4 = lz4c
+XZ = xz
+
+# GZIP, BZIP2, LZOP env vars are used by the tools. Support them as the command
+# line interface, but use _GZIP, _BZIP2, _LZOP internally.
+_GZIP := $(GZIP)
+_BZIP2 := $(BZIP2)
+_LZOP := $(LZOP)
+
+# Reset GZIP, BZIP2, LZOP in this Makefile
+override GZIP=
+override BZIP2=
+override LZOP=
+
+# Reset GZIP, BZIP2, LZOP in recursive invocations
+MAKEOVERRIDES += GZIP= BZIP2= LZOP=
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
+export _GZIP _BZIP2 _LZOP LZMA LZ4 XZ
export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
# targets and others. In general all targets except *config targets.
# If building an external module we do not care about the all: rule
-# but instead _all depend on modules
+# but instead __all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
-_all: all
+__all: all
else
-_all: modules
+__all: modules
endif
# Decide whether to build built-in, modular, or both.
KBUILD_BUILTIN := 1
# If we have only "make modules", don't compile built-in objects.
-# When we're building modules with modversions, we need to consider
-# the built-in objects during the descend as well, in order to
-# make sure the checksums are up to date before we record them.
-
ifeq ($(MAKECMDGOALS),modules)
- KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
+ KBUILD_BUILTIN :=
endif
# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well
-ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
+ifneq ($(filter all modules nsdeps,$(MAKECMDGOALS)),)
KBUILD_MODULES := 1
endif
ifeq ($(KBUILD_EXTMOD),)
# Objects we will link into vmlinux / subdirs we need to visit
-init-y := init/
+core-y := init/ usr/
drivers-y := drivers/ sound/
drivers-$(CONFIG_SAMPLES) += samples/
-net-y := net/
+drivers-y += net/ virt/
libs-y := lib/
-core-y := usr/
-virt-y := virt/
endif # KBUILD_EXTMOD
# The all: target is the default when no target is given on the
# This exploits the 'multi-target pattern rule' trick.
# The syncconfig should be executed only once to make all the targets.
# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
-%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
+%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
else # !may-sync-config
# External modules and some install targets need include/generated/autoconf.h
$(call cc-option,-fno-var-tracking)
endif
+ifdef CONFIG_DEBUG_INFO_COMPRESSED
+DEBUG_CFLAGS += -gz=zlib
+KBUILD_AFLAGS += -Wa,--compress-debug-sections=zlib
+KBUILD_LDFLAGS += --compress-debug-sections=zlib
+endif
+
KBUILD_CFLAGS += $(DEBUG_CFLAGS)
export DEBUG_CFLAGS
LDFLAGS_vmlinux += --pack-dyn-relocs=relr
endif
+# Align the bit size of userspace programs with the kernel
+KBUILD_USERCFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
+KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
+
# make the checker run with the right architecture
CHECKFLAGS += --arch=$(ARCH)
mod_compress_cmd = true
ifdef CONFIG_MODULE_COMPRESS
ifdef CONFIG_MODULE_COMPRESS_GZIP
- mod_compress_cmd = gzip -n -f
+ mod_compress_cmd = $(_GZIP) -n -f
endif # CONFIG_MODULE_COMPRESS_GZIP
ifdef CONFIG_MODULE_COMPRESS_XZ
- mod_compress_cmd = xz -f
+ mod_compress_cmd = $(XZ) -f
endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd
ifeq ($(KBUILD_EXTMOD),)
core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
-vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
+vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
- $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
+ $(libs-y) $(libs-m)))
vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
- $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
- $(drivers-) $(net-) $(libs-) $(virt-))))
+ $(patsubst %/,%,$(filter %/, $(core-) \
+ $(drivers-) $(libs-))))
+
+subdir-modorder := $(addsuffix modules.order,$(filter %/, \
+ $(core-y) $(core-m) $(libs-y) $(libs-m) \
+ $(drivers-y) $(drivers-m)))
build-dirs := $(vmlinux-dirs)
clean-dirs := $(vmlinux-alldirs)
-init-y := $(patsubst %/, %/built-in.a, $(init-y))
-core-y := $(patsubst %/, %/built-in.a, $(core-y))
-drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
-net-y := $(patsubst %/, %/built-in.a, $(net-y))
-libs-y2 := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
+# Externally visible symbols (used by link-vmlinux.sh)
+KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
+KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
ifdef CONFIG_MODULES
-libs-y1 := $(filter-out %/, $(libs-y))
-libs-y2 += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
+KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
+KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
else
-libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
+KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
endif
-virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
+KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
-# Externally visible symbols (used by link-vmlinux.sh)
-export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
- $(drivers-y) $(net-y) $(virt-y)
-export KBUILD_VMLINUX_LIBS := $(libs-y1)
+export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
export LDFLAGS_vmlinux
# used by scripts/Makefile.package
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
ifdef CONFIG_TRIM_UNUSED_KSYMS
-autoksyms_recursive: descend modules.order
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
- "$(MAKE) -f $(srctree)/Makefile vmlinux"
-endif
-
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
# (this can be evaluated only once include/config/auto.conf has been included)
-ifdef CONFIG_TRIM_UNUSED_KSYMS
- KBUILD_MODULES := 1
+KBUILD_MODULES := 1
+
+autoksyms_recursive: descend modules.order
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
+ "$(MAKE) -f $(srctree)/Makefile vmlinux"
endif
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
-$(sort $(vmlinux-deps)): descend ;
+$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
filechk_kernel.release = \
echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
PHONY += prepare archprepare
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
- asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
+ asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
+ include/generated/autoconf.h
prepare0: archprepare
$(Q)$(MAKE) $(build)=scripts/mod
# ---------------------------------------------------------------------------
# Modules
+# install modules.builtin regardless of CONFIG_MODULES
+PHONY += _builtin_inst_
+_builtin_inst_:
+ @mkdir -p $(MODLIB)/
+ @cp -f modules.builtin $(MODLIB)/
+ @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
+
+PHONY += install
+install: _builtin_inst_
+
ifdef CONFIG_MODULES
# By default, build modules as well
all: modules
+# When we're building modules with modversions, we need to consider
+# the built-in objects during the descend as well, in order to
+# make sure the checksums are up to date before we record them.
+ifdef CONFIG_MODVERSIONS
+ KBUILD_BUILTIN := 1
+endif
+
# Build modules
#
# A module can be listed more than once in obj-m resulting in
# using awk while concatenating to the final file.
PHONY += modules
-modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
+modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
-modules.order: descend
- $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
+PHONY += modules_check
+modules_check: modules.order
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
+
+cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
+
+modules.order: $(subdir-modorder) FORCE
+ $(call if_changed,modules_order)
+
+targets += modules.order
# Target to prepare building external modules
PHONY += modules_prepare
modules_install: _modinst_ _modinst_post
PHONY += _modinst_
-_modinst_:
+_modinst_: _builtin_inst_
@rm -rf $(MODLIB)/kernel
@rm -f $(MODLIB)/source
@mkdir -p $(MODLIB)/kernel
ln -s $(CURDIR) $(MODLIB)/build ; \
fi
@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
- @cp -f modules.builtin $(MODLIB)/
- @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
# This depmod is only for convenience to give the initial
# make distclean Remove editor backup files, patch leftover files and the like
# Directories & files removed with 'make clean'
-CLEAN_DIRS += include/ksym
-CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
+CLEAN_FILES += include/ksym vmlinux.symvers \
+ modules.builtin modules.builtin.modinfo modules.nsdeps
# Directories & files removed with 'make mrproper'
-MRPROPER_DIRS += include/config include/generated \
+MRPROPER_FILES += include/config include/generated \
arch/$(SRCARCH)/include/generated .tmp_objdiff \
- debian/ snap/ tar-install/
-MRPROPER_FILES += .config .config.old .version \
+ debian snap tar-install \
+ .config .config.old .version \
Module.symvers \
signing_key.pem signing_key.priv signing_key.x509 \
x509.genkey extra_certificates signing_key.x509.keyid \
*.spec
# Directories & files removed with 'make distclean'
-DISTCLEAN_DIRS +=
DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
# clean - Delete most, but leave enough to build external modules
#
-clean: rm-dirs := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
PHONY += archclean vmlinuxclean
# mrproper - Delete all generated files, including .config
#
-mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs := $(addprefix _mrproper_,scripts)
$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
mrproper: clean $(mrproper-dirs)
- $(call cmd,rmdirs)
$(call cmd,rmfiles)
# distclean
#
-distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS))
distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
PHONY += distclean
distclean: mrproper
- $(call cmd,rmdirs)
$(call cmd,rmfiles)
@find $(srctree) $(RCS_FIND_IGNORE) \
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
# We are always building modules
KBUILD_MODULES := 1
-PHONY += $(objtree)/Module.symvers
-$(objtree)/Module.symvers:
- @test -e $(objtree)/Module.symvers || ( \
- echo; \
- echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
- echo " is missing; modules will have no dependencies and modversions."; \
- echo )
-
build-dirs := $(KBUILD_EXTMOD)
PHONY += modules
-modules: descend $(objtree)/Module.symvers
+modules: descend
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
PHONY += modules_install
clean-dirs := $(KBUILD_EXTMOD)
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
-PHONY += /
-/:
- @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
-
PHONY += help
help:
@echo ' Building external modules.'
endif
+ifndef CONFIG_MODULES
+KBUILD_MODULES :=
+endif
+
# Handle descending into subdirectories listed in $(build-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
clean: $(clean-dirs)
- $(call cmd,rmdirs)
$(call cmd,rmfiles)
@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
$(Q)mkdir -p $(objtree)/tools
$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
-# FIXME Should go into a make.lib or something
-# ===========================================================================
-
-quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
- cmd_rmdirs = rm -rf $(rm-dirs)
-
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
- cmd_rmfiles = rm -f $(rm-files)
+ cmd_rmfiles = rm -rf $(rm-files)
# Run depmod only if we have System.map and depmod is executable
quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
projects / linux-2.6-microblaze.git / blobdiff