this-makefile := $(lastword $(MAKEFILE_LIST))
abs_srctree := $(realpath $(dir $(this-makefile)))
-abs_objtree := $(CURDIR)
+abs_output := $(CURDIR)
ifneq ($(sub_make_done),1)
KBUILD_EXTMOD := $(M)
endif
+ifeq ("$(origin MO)", "command line")
+ KBUILD_EXTMOD_OUTPUT := $(MO)
+endif
+
$(if $(word 2, $(KBUILD_EXTMOD)), \
$(error building multiple external modules is not supported))
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.
-# Do we want to change the working directory?
ifeq ("$(origin O)", "command line")
KBUILD_OUTPUT := $(O)
endif
-ifneq ($(KBUILD_OUTPUT),)
+ifdef KBUILD_EXTMOD
+ ifdef KBUILD_OUTPUT
+ objtree := $(realpath $(KBUILD_OUTPUT))
+ $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist))
+ else
+ objtree := $(abs_srctree)
+ endif
+ # If Make is invoked from the kernel directory (either kernel
+ # source directory or kernel build directory), external modules
+ # are built in $(KBUILD_EXTMOD) for backward compatibility,
+ # otherwise, built in the current directory.
+ output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD)))
+ # KBUILD_EXTMOD might be a relative path. Remember its absolute path before
+ # Make changes the working directory.
+ srcroot := $(realpath $(KBUILD_EXTMOD))
+ $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist))
+else
+ objtree := .
+ output := $(KBUILD_OUTPUT)
+endif
+
+export objtree srcroot
+
+# Do we want to change the working directory?
+ifneq ($(output),)
# $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
-$(shell mkdir -p "$(KBUILD_OUTPUT)")
+$(shell mkdir -p "$(output)")
# $(realpath ...) resolves symlinks
-abs_objtree := $(realpath $(KBUILD_OUTPUT))
-$(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
-endif # ifneq ($(KBUILD_OUTPUT),)
+abs_output := $(realpath $(output))
+$(if $(abs_output),,$(error failed to create output directory "$(output)"))
+endif
ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif # sub_make_done
-ifeq ($(abs_objtree),$(CURDIR))
+ifeq ($(abs_output),$(CURDIR))
# Suppress "Entering directory ..." if we are at the final work directory.
no-print-directory := --no-print-directory
else
# Invoke a second make in the output directory, passing relevant variables
__sub-make:
- $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
+ $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \
-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
else # need-sub-make
# We process the rest of the Makefile if this is the final invocation of make
-ifeq ($(abs_srctree),$(abs_objtree))
- # building in the source tree
- srctree := .
- building_out_of_srctree :=
-else
- ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
- # building in a subdirectory of the source tree
- srctree := ..
- else
- srctree := $(abs_srctree)
- endif
- building_out_of_srctree := 1
+ifndef KBUILD_EXTMOD
+srcroot := $(abs_srctree)
endif
-ifneq ($(KBUILD_ABS_SRCTREE),)
-srctree := $(abs_srctree)
+ifeq ($(srcroot),$(CURDIR))
+building_out_of_srctree :=
+else
+export building_out_of_srctree := 1
endif
-objtree := .
+ifdef KBUILD_ABS_SRCTREE
+ # Do nothing. Use the absolute path.
+else ifeq ($(srcroot),$(CURDIR))
+ # Building in the source.
+ srcroot := .
+else ifeq ($(srcroot)/,$(dir $(CURDIR)))
+ # Building in a subdirectory of the source.
+ srcroot := ..
+endif
-VPATH :=
+export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot))
-ifeq ($(KBUILD_EXTMOD),)
ifdef building_out_of_srctree
-VPATH := $(srctree)
-endif
+export VPATH := $(srcroot)
+else
+VPATH :=
endif
-export building_out_of_srctree srctree objtree VPATH
-
# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
outputmakefile rustavailable rustfmt rustfmtcheck
no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
image_name
-single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
+single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/
config-build :=
mixed-build :=
include $(srctree)/scripts/Kbuild.include
# Read KERNELRELEASE from include/config/kernel.release (if it exists)
-KERNELRELEASE = $(call read-file, include/config/kernel.release)
+KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
KBZIP2 = bzip2
KLZOP = lzop
LZMA = lzma
-LZ4 = lz4c
+LZ4 = lz4
XZ = xz
ZSTD = zstd
LINUXINCLUDE := \
-I$(srctree)/arch/$(SRCARCH)/include \
-I$(objtree)/arch/$(SRCARCH)/include/generated \
- $(if $(building_out_of_srctree),-I$(srctree)/include) \
+ -I$(srctree)/include \
-I$(objtree)/include \
$(USERINCLUDE)
# At the same time when output Makefile generated, generate .gitignore to
# ignore whole output directory
+ifdef KBUILD_EXTMOD
+print_env_for_makefile = \
+ echo "export KBUILD_OUTPUT = $(objtree)"; \
+ echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \
+ echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)"
+else
+print_env_for_makefile = \
+ echo "export KBUILD_OUTPUT = $(CURDIR)"
+endif
+
quiet_cmd_makefile = GEN Makefile
cmd_makefile = { \
- echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
- echo "include $(srctree)/Makefile"; \
+ echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \
+ $(print_env_for_makefile); \
+ echo "include $(abs_srctree)/Makefile"; \
} > Makefile
outputmakefile:
+ifeq ($(KBUILD_EXTMOD),)
@if [ -f $(srctree)/.config -o \
-d $(srctree)/include/config -o \
-d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
echo >&2 "***"; \
false; \
fi
- $(Q)ln -fsn $(srctree) source
+else
+ @if [ -f $(srcroot)/modules.order ]; then \
+ echo >&2 "***"; \
+ echo >&2 "*** The external module source tree is not clean."; \
+ echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \
+ echo >&2 "***"; \
+ false; \
+ fi
+endif
+ $(Q)ln -fsn $(srcroot) source
$(call cmd,makefile)
$(Q)test -e .gitignore || \
{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well
-ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
+ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),)
KBUILD_MODULES := 1
endif
export KBUILD_MODULES KBUILD_BUILTIN
ifdef need-config
-include include/config/auto.conf
+include $(objtree)/include/config/auto.conf
endif
ifeq ($(KBUILD_EXTMOD),)
else # !may-sync-config
# External modules and some install targets need include/generated/autoconf.h
# and include/config/auto.conf but do not care if they are up-to-date.
-# Use auto.conf to trigger the test
-PHONY += include/config/auto.conf
-
-include/config/auto.conf:
- @test -e include/generated/autoconf.h -a -e $@ || ( \
- echo >&2; \
- echo >&2 " ERROR: Kernel configuration is invalid."; \
- echo >&2 " include/generated/autoconf.h or $@ are missing.";\
- echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
- echo >&2 ; \
- /bin/false)
+# Use auto.conf to show the error message
+
+checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf)
+missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs))
+
+ifdef missing-configs
+PHONY += $(objtree)/include/config/auto.conf
+
+$(objtree)/include/config/auto.conf:
+ @echo >&2 '***'
+ @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:'
+ @printf >&2 '*** - %s\n' $(missing-configs)
+ @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.'
+ @echo >&2 '***'
+ @/bin/false
+endif
endif # may-sync-config
endif # need-config
KBUILD_CFLAGS += -fconserve-stack
endif
-# change __FILE__ to the relative path from the srctree
-KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
+# change __FILE__ to the relative path to the source directory
+ifdef building_out_of_srctree
+KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
+endif
# include additional Makefiles when needed
include-y := scripts/Makefile.extrawarn
include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
include-$(CONFIG_KCOV) += scripts/Makefile.kcov
include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
+include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo
+include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller
include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
include $(addprefix $(srctree)/, $(include-y))
PHONY += prepare0
-export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
-export MODORDER := $(extmod_prefix)modules.order
-export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
-
ifeq ($(KBUILD_EXTMOD),)
build-dir := .
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
asm-generic $(version_h) include/generated/utsrelease.h \
- include/generated/compile.h include/generated/autoconf.h remove-stale-files
+ include/generated/compile.h include/generated/autoconf.h \
+ include/generated/rustc_cfg remove-stale-files
prepare0: archprepare
$(Q)$(MAKE) $(build)=scripts/mod
all: dtbs
endif
+ifdef CONFIG_GENERIC_BUILTIN_DTB
+vmlinux: dtbs
+endif
+
endif
PHONY += scripts_dtc
modules.builtin modules.builtin.modinfo modules.nsdeps \
modules.builtin.ranges vmlinux.o.map \
compile_commands.json rust/test \
- rust-project.json .vmlinux.objs .vmlinux.export.c
+ rust-project.json .vmlinux.objs .vmlinux.export.c \
+ .builtin-dtbs-list .builtin-dtb.S
# Directories & files removed with 'make mrproper'
MRPROPER_FILES += include/config include/generated \
# Formatting targets
PHONY += rustfmt rustfmtcheck
-# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
-#
-# We match using absolute paths since `find` does not resolve them
-# when matching, which is a problem when e.g. `srctree` is `..`.
-# We `grep` afterwards in order to remove the directory entry itself.
rustfmt:
- $(Q)find $(abs_srctree) -type f -name '*.rs' \
- -o -path $(abs_srctree)/rust/alloc -prune \
- -o -path $(abs_objtree)/rust/test -prune \
- | grep -Fv $(abs_srctree)/rust/alloc \
- | grep -Fv $(abs_objtree)/rust/test \
- | grep -Fv generated \
+ $(Q)find $(srctree) $(RCS_FIND_IGNORE) \
+ -type f -a -name '*.rs' -a ! -name '*generated*' -print \
| xargs $(RUSTFMT) $(rustfmt_flags)
rustfmtcheck: rustfmt_flags = --check
KBUILD_BUILTIN :=
KBUILD_MODULES := 1
-build-dir := $(KBUILD_EXTMOD)
+build-dir := .
-compile_commands.json: $(extmod_prefix)compile_commands.json
-PHONY += compile_commands.json
-
-clean-dirs := $(KBUILD_EXTMOD)
-clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
- $(KBUILD_EXTMOD)/compile_commands.json
+clean-dirs := .
+clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json
PHONY += prepare
# now expand this into a simple variable to reduce the cost of shell evaluations
ifdef CONFIG_MODULES
-$(MODORDER): $(build-dir)
+modules.order: $(build-dir)
@:
# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
endif
PHONY += modules_check
-modules_check: $(MODORDER)
+modules_check: modules.order
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
else # CONFIG_MODULES
$(single-no-ko): $(build-dir)
@:
-# Remove MODORDER when done because it is not the real one.
+# Remove modules.order when done because it is not the real one.
PHONY += single_modules
single_modules: $(single-no-ko) modules_prepare
- $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
+ $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
ifneq ($(KBUILD_MODPOST_NOFINAL),1)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
endif
- $(Q)rm -f $(MODORDER)
+ $(Q)rm -f modules.order
single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
endif
+prepare: outputmakefile
+
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
clean: $(clean-dirs)
$(call cmd,rmfiles)
- @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
+ @find . $(RCS_FIND_IGNORE) \
\( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
-o -name '*.ko.*' \
-o -name '*.dtb' -o -name '*.dtbo' \
PHONY += rust-analyzer
rust-analyzer:
+$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
+ifdef KBUILD_EXTMOD
+# FIXME: external modules must not descend into a sub-directory of the kernel
+ $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@
+else
$(Q)$(MAKE) $(build)=rust $@
+endif
# Script to generate missing namespace dependencies
# ---------------------------------------------------------------------------
quiet_cmd_gen_compile_commands = GEN $@
cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
-$(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
+compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
$(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
- $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
+ $(if $(CONFIG_MODULES), modules.order) FORCE
$(call if_changed,gen_compile_commands)
-targets += $(extmod_prefix)compile_commands.json
+targets += compile_commands.json
PHONY += clang-tidy clang-analyzer
quiet_cmd_clang_tools = CHECK $<
cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
-clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
+clang-tidy clang-analyzer: compile_commands.json
$(call cmd,clang_tools)
else
clang-tidy clang-analyzer:
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