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Makefile
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VERSION_MAJOR = 0
VERSION_MINOR = 6
PATCHLEVEL = 0
VERSION_RESERVED = 0
EXTRAVERSION = -rc2
NAME = Zephyr Kernel
export SOURCE_DIR PROJECT MDEF_FILE KLIBC_DIR
# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
#
# o Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC
# Avoid interference with shell env settings
unexport GREP_OPTIONS
DQUOTE = "
#This comment line is to fix the highlighting of some editors due the quote effect."
# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
# unavoidable when linking the built-in.o targets which finally
# turn into the kernel binary), we will call a sub make in that other
# dir, and after that we are sure that everything which is in that
# other dir is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.
# Beautify output
# ---------------------------------------------------------------------------
#
# Normally, we echo the whole command before executing it. By making
# that echo $($(quiet)$(cmd)), we now have the possibility to set
# $(quiet) to choose other forms of output instead, e.g.
#
# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
#
# If $(quiet) is empty, the whole command will be printed.
# If it is set to "quiet_", only the short version will be printed.
# If it is set to "silent_", nothing will be printed at all, since
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
# A simple variant is to prefix commands with $(Q) - that's useful
# for commands that shall be hidden in non-verbose mode.
#
# $(Q)ln $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
#
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands
ifeq ("$(origin V)", "command line")
KBUILD_VERBOSE = $(V)
endif
ifndef KBUILD_VERBOSE
KBUILD_VERBOSE = 0
endif
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
# If the user is running make -s (silent mode), suppress echoing of
# commands
ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
quiet=silent_
endif
else # make-3.8x
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
quiet=silent_
endif
endif
export quiet Q KBUILD_VERBOSE
# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
#
# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.
# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)
# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
ifeq ("$(origin O)", "command line")
KBUILD_OUTPUT := $(O)
endif
# That's our default target when none is given on the command line
PHONY := _all
_all:
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;
ifneq ($(KBUILD_OUTPUT),)
# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
&& /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
$(error failed to create output directory "$(saved-output)"))
PHONY += $(MAKECMDGOALS) sub-make
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
@:
sub-make: FORCE
$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
# Leave processing to above invocation of make
skip-makefile := 1
endif # ifneq ($(KBUILD_OUTPUT),)
endif # ifeq ($(KBUILD_SRC),)
# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)
# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory
# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
ifeq ("$(origin C)", "command line")
KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
KBUILD_CHECKSRC = 0
endif
PHONY += all
_all: all
ifeq ($(KBUILD_SRC),)
# building in the source tree
srctree := .
else
ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
# building in a subdirectory of the source tree
srctree := ..
else
srctree := $(KBUILD_SRC)
endif
endif
objtree := .
src := $(srctree)
obj := $(objtree)
VPATH := $(srctree)
export srctree objtree VPATH
# SUBARCH tells the usermode build what the underlying arch is. That is set
# first, and if a usermode build is happening, the "ARCH=um" on the command
# line overrides the setting of ARCH below. If a native build is happening,
# then ARCH is assigned, getting whatever value it gets normally, and
# SUBARCH is subsequently ignored.
SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
-e s/sun4u/sparc64/ \
-e s/arm.*/arm/ -e s/sa110/arm/ \
-e s/s390x/s390/ -e s/parisc64/parisc/ \
-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
# Cross compiling and selecting different set of gcc/bin-utils
# ---------------------------------------------------------------------------
#
# When performing cross compilation for other architectures ARCH shall be set
# to the target architecture. (See arch/* for the possibilities).
# ARCH can be set during invocation of make:
# make ARCH=x86
# Another way is to have ARCH set in the environment.
# The default ARCH is the host where make is executed.
# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=i586-pc-elf
# Alternatively CROSS_COMPILE can be set in the environment.
# A third alternative is to store a setting in .config so that plain
# "make" in the configured kernel build directory always uses that.
# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
ARCH ?= $(SUBARCH)
CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
# Architecture as present in compile.h
UTS_MACHINE := $(ARCH)
SRCARCH := $(ARCH)
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
SRCARCH := x86
endif
# Additional ARCH settings for sparc
ifeq ($(ARCH),sparc32)
SRCARCH := sparc
endif
ifeq ($(ARCH),sparc64)
SRCARCH := sparc
endif
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
SRCARCH := sh
endif
# Additional ARCH settings for tile
ifeq ($(ARCH),tilepro)
SRCARCH := tile
endif
ifeq ($(ARCH),tilegx)
SRCARCH := tile
endif
# Where to locate arch specific headers
hdr-arch := $(SRCARCH)
KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG
# SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
else if [ -x /bin/bash ]; then echo /bin/bash; \
else echo sh; fi ; fi)
HOSTCC = gcc
HOSTCXX = g++
HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
HOSTCXXFLAGS = -O2
ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
-Wno-missing-field-initializers -fno-delete-null-pointer-checks
endif
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
KBUILD_MODULES :=
KBUILD_BUILTIN := 1
export KBUILD_MODULES KBUILD_BUILTIN
export KBUILD_CHECKSRC KBUILD_SRC
ifneq ($(CC),)
ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
COMPILER := clang
else
COMPILER := gcc
endif
export COMPILER
endif
# Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(srctree)
# We need some generic definitions (do not try to remake the file).
$(srctree)/scripts/Kbuild.include: ;
include $(srctree)/scripts/Kbuild.include
ifeq ($(USE_CCACHE),1)
CCACHE := ccache
endif
# Make variables (CC, etc...)
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
ifeq ($(USE_CCACHE),1)
CC = $(CCACHE) $(CROSS_COMPILE)gcc
else
CC = $(CROSS_COMPILE)gcc
endif
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
AWK = awk
GENKSYMS = scripts/genksyms/genksyms
GENIDT = scripts/gen_idt/gen_idt
GENOFFSET_H = scripts/gen_offset_header/gen_offset_header
PERL = perl
PYTHON = python
CHECK = sparse
CHECKFLAGS := -Wbitwise -Wno-return-void $(CF)
CFLAGS_MODULE =
AFLAGS_MODULE =
LDFLAGS_MODULE =
CFLAGS_KERNEL =
AFLAGS_KERNEL =
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE := -include $(CURDIR)/include/generated/autoconf.h
PROJECTINCLUDE := $(strip -I$(srctree)/include/microkernel \
-I$(CURDIR)/misc/generated/sysgen) \
$(USERINCLUDE)
# Use ZEPHYRINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
ZEPHYRINCLUDE := \
-I$(srctree)/arch/$(hdr-arch)/include \
$(if $(KBUILD_SRC), -I$(srctree)/include) \
-I$(srctree)/include \
-I$(CURDIR)/include/generated \
-I$(CURDIR)/misc/generated/sysgen \
$(USERINCLUDE) \
$(STDINCLUDE)
KBUILD_CPPFLAGS := -DKERNEL
KBUILD_CFLAGS := -c -g -std=c99 \
-fno-reorder-functions \
-fno-asynchronous-unwind-tables \
-fno-omit-frame-pointer \
-fno-defer-pop -Wall \
-Wno-unused-but-set-variable \
-Wno-format-zero-length \
-Wno-main -ffreestanding
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
KBUILD_AFLAGS := -c -g -xassembler-with-cpp
LDFLAGS += $(call ld-option,-nostartfiles)
LDFLAGS += $(call ld-option,-nodefaultlibs)
LDFLAGS += $(call ld-option,-nostdlib)
LDFLAGS += $(call ld-option,-static)
LDLIBS_TOOLCHAIN ?= -lgcc
KERNELVERSION = $(VERSION_MAJOR)$(if $(VERSION_MINOR),.$(VERSION_MINOR)$(if $(PATCHLEVEL),.$(PATCHLEVEL)))$(EXTRAVERSION)
export VERSION_MAJOR VERSION_MINOR PATCHLEVEL VERSION_RESERVED EXTRAVERSION
export KERNELRELEASE KERNELVERSION
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM STRIP OBJCOPY OBJDUMP
export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE GENIDT GENOFFSET_H
export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
export KBUILD_CPPFLAGS NOSTDINC_FLAGS ZEPHYRINCLUDE OBJCOPYFLAGS LDFLAGS
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
export KBUILD_ARFLAGS PROJECTINCLUDE LDLIBS_TOOLCHAIN
# Files to ignore in find ... statements
export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
-name CVS -o -name .pc -o -name .hg -o -name .git \) \
-prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
--exclude CVS --exclude .pc --exclude .hg --exclude .git
# ===========================================================================
# Rules shared between *config targets and build targets
# Basic helpers built in scripts/
PHONY += scripts_basic
scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic
$(Q)$(MAKE) $(build)=scripts/gen_idt
$(Q)$(MAKE) $(build)=scripts/gen_offset_header
$(Q)rm -f .tmp_quiet_recordmcount
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;
PHONY += outputmakefile
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
outputmakefile:
ifneq ($(KBUILD_SRC),)
$(Q)ln -fsn $(srctree) source
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
$(srctree) $(objtree) $(VERSION_MAJOR) $(VERSION_MINOR)
endif
# Support for using generic headers in asm-generic
PHONY += asm-generic
asm-generic:
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
src=asm obj=arch/$(SRCARCH)/include/generated/asm
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
# 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
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).
version_h := include/generated/version.h
no-dot-config-targets := pristine distclean clean mrproper help \
cscope gtags TAGS tags help% %docs check% coccicheck \
$(version_h) headers_% archheaders archscripts \
kernelversion %src-pkg
config-targets := 0
mixed-targets := 0
dot-config := 1
ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
dot-config := 0
endif
endif
ifneq ($(filter config %config,$(MAKECMDGOALS)),)
config-targets := 1
ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
mixed-targets := 1
endif
endif
ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.
PHONY += $(MAKECMDGOALS) __build_one_by_one
$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
@:
__build_one_by_one:
$(Q)set -e; \
for i in $(MAKECMDGOALS); do \
$(MAKE) -f $(srctree)/Makefile $$i; \
done
else
ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target
# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
include $(srctree)/arch/$(SRCARCH)/Makefile
export KBUILD_DEFCONFIG KBUILD_KCONFIG
config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@
%config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@
else
# ===========================================================================
# Build targets only - this includes zephyr, arch specific targets, clean
# targets and others. In general all targets except *config targets.
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
$(Q)$(MAKE) $(build)=$(@)
core-y := lib/ arch/ kernel/ misc/ net/
drivers-y := drivers/
ifneq ($(strip $(PROJECT)),)
-include $(PROJECT)/Makefile.app
ifneq ($(strip $(KBUILD_ZEPHYR_APP)),)
export KBUILD_ZEPHYR_APP
endif
core-y += $(SOURCE_DIR)
endif
ifeq ($(dot-config),1)
# Read in config
-include include/config/auto.conf
# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
-include include/config/auto.conf.cmd
# To avoid any implicit rule to kick in, define an empty command
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
# If .config is newer than include/config/auto.conf, someone tinkered
# with it and forgot to run make oldconfig.
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
# we execute the config step to be sure to catch updated Kconfig files
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
else
# Dummy target needed, because used as prerequisite
include/config/auto.conf: ;
endif # $(dot-config)
ifdef CONFIG_TINYCRYPT
# Objects we will link into the kernel / subdirs we need to visit
KCRYPTO_DIR := lib/crypto/tinycrypt
libs-y += $(KCRYPTO_DIR)/
ZEPHYRINCLUDE += -I$(srctree)/lib/crypto/tinycrypt/include
endif
ifdef ZEPHYR_GCC_VARIANT
include $(srctree)/scripts/Makefile.toolchain.$(ZEPHYR_GCC_VARIANT)
else
$(if $(CROSS_COMPILE),, \
$(error ZEPHYR_GCC_VARIANT is not set. ))
endif
ifdef CONFIG_MINIMAL_LIBC
ZEPHYRINCLUDE += -I$(srctree)/lib/libc/minimal/include
endif
ifdef CONFIG_NEWLIB_LIBC
ZEPHYRINCLUDE += $(TOOLCHAIN_CFLAGS)
ALL_LIBS += c m
endif
QEMU_BIN_PATH ?= /usr/bin
QEMU = $(QEMU_BIN_PATH)/$(QEMU_$(SRCARCH))
# The all: target is the default when no target is given on the
# command line.
# This allow a user to issue only 'make' to build a kernel including modules
# Defaults to zephyr, but the arch makefile usually adds further targets
all: zephyr
ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
# ipa clone creates specialized cloned functions
# partial inlining inlines only parts of functions
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
$(call cc-option,-fno-ipa-cp-clone,) \
$(call cc-option,-fno-partial-inlining)
endif
# Handle stack protector mode.
#
# Since kbuild can potentially perform two passes (first with the old
# .config values and then with updated .config values), we cannot error out
# if a desired compiler option is unsupported. If we were to error, kbuild
# could never get to the second pass and actually notice that we changed
# the option to something that was supported.
#
# Additionally, we don't want to fallback and/or silently change which compiler
# flags will be used, since that leads to producing kernels with different
# security feature characteristics depending on the compiler used. ("But I
# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
#
# The middle ground is to warn here so that the failed option is obvious, but
# to let the build fail with bad compiler flags so that we can't produce a
# kernel when there is a CONFIG and compiler mismatch.
#
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
stackp-flag := -fstack-protector
ifeq ($(call cc-option, $(stackp-flag)),)
$(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
-fstack-protector not supported by compiler)
endif
else
ifdef CONFIG_CC_STACKPROTECTOR_STRONG
stackp-flag := -fstack-protector-strong
ifeq ($(call cc-option, $(stackp-flag)),)
$(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
-fstack-protector-strong not supported by compiler)
endif
endif
endif
KBUILD_CFLAGS += $(stackp-flag)
ifeq ($(CONFIG_DEBUG),y)
KBUILD_CFLAGS += -O0
else
KBUILD_CFLAGS += -Os
endif
KBUILD_CFLAGS += $(subst $(DQUOTE),,$(CONFIG_COMPILER_OPT))
export LDFLAG_LINKERCMD OUTPUT_FORMAT OUTPUT_ARCH
include arch/$(SRCARCH)/Makefile
KBUILD_CFLAGS += $(CFLAGS)
KBUILD_AFLAGS += $(CFLAGS)
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif
# arch Makefile may override CC so keep this after arch Makefile is included
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)
# disable pointer signed / unsigned warnings in gcc 4.0
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
# generate an extra file that specifies the maximum amount of stack used,
# on a per-function basis.
KBUILD_CFLAGS += $(call cc-option,-fstack-usage)
# conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
# disallow errors like 'EXPORT_GPL(foo);' with missing header
KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
# Prohibit date/time macros, which would make the build non-deterministic
# KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)
include $(srctree)/scripts/Makefile.extrawarn
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
KBUILD_CFLAGS += $(KCFLAGS)
# Use --build-id when available.
LDFLAGS_zephyr += $(call ld-option,-nostartfiles)
LDFLAGS_zephyr += $(call ld-option,-nodefaultlibs)
LDFLAGS_zephyr += $(call ld-option,-nostdlib)
LDFLAGS_zephyr += $(call ld-option,-static)
LDFLAGS_zephyr += $(call ld-option,-X)
LDFLAGS_zephyr += $(call ld-option,-N)
LDFLAGS_zephyr += $(call ld-option,--gc-sections)
LDFLAGS_zephyr += $(call ld-option,--build-id=none)
LD_TOOLCHAIN ?= -D__GCC_LINKER_CMD__
KERNEL_NAME=$(subst $(DQUOTE),,$(CONFIG_KERNEL_BIN_NAME))
export LD_TOOLCHAIN KERNEL_NAME
# Default kernel image to build when no specific target is given.
# KBUILD_IMAGE may be overruled on the command line or
# set in the environment
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
# this default value
export KBUILD_IMAGE ?= zephyr
#
# INSTALL_PATH specifies where to place the updated kernel and system map
# images. Default is /boot, but you can set it to other values
export INSTALL_PATH ?= /boot
#
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
# an argument if needed. Otherwise it defaults to the kernel install path
#
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
core-y +=
zephyr-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
$(libs-y) $(libs-m)))
zephyr-alldirs := $(sort $(zephyr-dirs) $(patsubst %/,%,$(filter %/, \
$(init-) $(core-) $(drivers-) $(libs-))))
init-y := $(patsubst %/, %/built-in.o, $(init-y))
core-y := $(patsubst %/, %/built-in.o, $(core-y))
drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
libs-y := $(libs-y1) $(libs-y2)
# Externally visible symbols (used by link-zephyr.sh)
export KBUILD_ZEPHYR_INIT := $(head-y) $(init-y)
export KBUILD_ZEPHYR_MAIN := $(drivers-y) $(core-y) $(libs-y)
ifdef CONFIG_HAVE_CUSTOM_LINKER_SCRIPT
export KBUILD_LDS := $(subst $(DQUOTE),,$(CONFIG_CUSTOM_LINKER_SCRIPT))
else
export KBUILD_LDS := $(srctree)/arch/$(SRCARCH)/platforms/$(subst $(DQUOTE),,$(CONFIG_PLATFORM))/linker.cmd
endif
export LDFLAGS_zephyr
# used by scripts/pacmage/Makefile
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(zephyr-alldirs)) arch include samples scripts)
zephyr-deps := $(KBUILD_LDS) $(KBUILD_ZEPHYR_INIT) $(KBUILD_ZEPHYR_MAIN)
ALL_LIBS += $(TOOLCHAIN_LIBS)
export ALL_LIBS
# Final link of zephyr
cmd_link-zephyr = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_zephyr) $(LIB_INCLUDE_DIR) $(ALL_LIBS)
quiet_cmd_link-zephyr = LINK $@
# Include targets which we want to
# execute if the rest of the kernel build went well.
zephyr: scripts/link-zephyr.sh $(zephyr-deps) $(KBUILD_ZEPHYR_APP) FORCE
@touch zephyr
ifdef CONFIG_HEADERS_CHECK
$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
ifneq ($(strip $(PROJECT)),)
+$(call if_changed,link-zephyr)
endif
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(zephyr-deps)): $(zephyr-dirs) ;
# Handle descending into subdirectories listed in $(zephyr-dirs)
# 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.
# Error messages still appears in the original language
PHONY += $(zephyr-dirs)
$(zephyr-dirs): prepare scripts
$(Q)$(MAKE) $(build)=$@
# Things we need to do before we recursively start building the kernel
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
# Listed in dependency order
PHONY += prepare prepare1 prepare2 prepare3
# prepare3 is used to check if we are building in a separate output directory,
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
prepare3:
ifneq ($(KBUILD_SRC),)
@$(kecho) ' Using $(srctree) as source for kernel'
$(Q)if [ -f $(srctree)/.config ]; then \
echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
echo >&2 " in the '$(srctree)' directory.";\
/bin/false; \
fi;
endif
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile
prepare1: prepare2 $(version_h) \
include/config/auto.conf
$(cmd_crmodverdir)
archprepare_common = $(strip \
archheaders archscripts prepare1 scripts_basic \
)
archprepare = $(strip \
$(archprepare_common) \
)
# All the preparing..
prepare: $(archprepare) FORCE
$(Q)$(MAKE) $(build)=.
# Generate some files
# ---------------------------------------------------------------------------
# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds
VERSION_MAJOR_HEX=$(shell printf '%02x\n' ${VERSION_MAJOR})
VERSION_MINOR_HEX=$(shell printf '%02x\n' ${VERSION_MINOR})
PATCHLEVEL_HEX=$(shell printf '%02x\n' ${PATCHLEVEL})
VERSION_RESERVED_HEX=00
KERNEL_VERSION_HEX=0x$(VERSION_MAJOR_HEX)$(VERSION_MINOR_HEX)$(PATCHLEVEL_HEX)
define filechk_version.h
(echo "#ifndef _KERNEL_VERSION_H_"; \
echo "#define _KERNEL_VERSION_H_"; \
echo ;\
(echo \#define ZEPHYR_VERSION_CODE $(shell \
expr $(VERSION_MAJOR) \* 65536 + 0$(VERSION_MINOR) \* 256 + 0$(PATCHLEVEL)); \
echo '#define ZEPHYR_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';); \
echo ;\
echo "#define KERNELVERSION \\"; \
echo "$(KERNEL_VERSION_HEX)$(VERSION_RESERVED_HEX)"; \
echo "#define KERNEL_VERSION_NUMBER $(KERNEL_VERSION_HEX)"; \
echo "#define KERNEL_VERSION_MAJOR $(VERSION_MAJOR)"; \
echo "#define KERNEL_VERSION_MINOR $(VERSION_MINOR)"; \
echo "#define KERNEL_PATCHLEVEL $(PATCHLEVEL)"; \
echo "#define KERNEL_VERSION_STRING \"$(KERNELVERSION)\""; \
echo; \
echo "#endif /* _KERNEL_VERSION_H_ */";)
endef
$(version_h): $(srctree)/Makefile FORCE
$(call filechk,version.h)
PHONY += headerdep
headerdep:
$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
$(srctree)/scripts/headerdep.pl -I$(srctree)/include
# ---------------------------------------------------------------------------
PHONY += depend dep
depend dep:
@echo '*** Warning: make $@ is unnecessary now.'
# ---------------------------------------------------------------------------
# Kernel headers
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
# If we do an all arch process set dst to asm-$(hdr-arch)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
PHONY += archheaders
archheaders:
PHONY += archscripts
archscripts:
PHONY += __headers
__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
$(Q)$(MAKE) $(build)=scripts build_unifdef
PHONY += headers_install_all
headers_install_all:
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
PHONY += headers_install
headers_install: __headers
$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
$(error Headers not exportable for the $(SRCARCH) architecture))
$(Q)$(MAKE) $(hdr-inst)=include/uapi
$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
PHONY += headers_check_all
headers_check_all: headers_install_all
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
PHONY += headers_check
headers_check: headers_install
$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
# ---------------------------------------------------------------------------
# Kernel selftest
PHONY += kselftest
kselftest:
$(Q)$(MAKE) -C tools/testing/selftests run_tests
###
# Cleaning is done on three levels.
# make clean Delete most generated files
# make mrproper Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like
# Directories & files removed with 'make clean'
CLEAN_DIRS += $(MODVERDIR)
CLEAN_FILES += misc/generated/sysgen/kernel_main.c \
misc/generated/sysgen/sysgen.h \
misc/generated/sysgen/prj.mdef
# Directories & files removed with 'make mrproper'
MRPROPER_DIRS += include/config usr/include include/generated \
arch/*/include/generated .tmp_objdiff
MRPROPER_FILES += .config .config.old .version $(version_h) \
Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
signing_key.priv signing_key.x509 x509.genkey \
extra_certificates signing_key.x509.keyid \
signing_key.x509.signer
# clean - Delete most
#
clean: rm-dirs := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
clean-dirs := $(addprefix _clean_, . $(zephyr-alldirs) )
PHONY += $(clean-dirs) clean archclean zephyrclean
$(clean-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
zephyrclean:
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-zephyr.sh clean
clean: archclean zephyrclean
# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs := $(addprefix _mrproper_,scripts)
PHONY += $(mrproper-dirs) mrproper archmrproper
$(mrproper-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
mrproper: clean archmrproper $(mrproper-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
# distclean
#
PHONY += distclean
distclean: mrproper
@find $(srctree) $(RCS_FIND_IGNORE) \
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
-o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
-type f -print | xargs rm -f
# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
boards := $(sort $(notdir $(boards)))
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))