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Makefile
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VERSION_MAJOR = 1
VERSION_MINOR = 9
PATCHLEVEL = 99
VERSION_RESERVED = 0
EXTRAVERSION =
NAME = Zephyr Kernel
export SOURCE_DIR PROJECT
ifeq ($(MAKECMDGOALS),)
$(error Invoking make from top-level kernel directory is not supported)
endif
# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.
#
# o Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
UNAME := $(shell uname)
ifeq (MSYS, $(findstring MSYS, $(UNAME)))
DISABLE_TRYRUN=y
HOST_OS=MSYS
NATIVE_PWD_OPT=-W
else ifeq (MINGW, $(findstring MINGW, $(UNAME)))
HOST_OS=MINGW
PWD_OPT=-W
NATIVE_PWD_OPT=-W
DISABLE_TRYRUN=y
CPATH ?= $(MIGW_DIR)/include
LIBRARY_PATH ?= $(MINGW_DIR)/lib
export CPATH LIBRARY_PATH
else ifeq (Linux, $(findstring Linux, $(UNAME)))
HOST_OS=Linux
else ifeq (Darwin, $(findstring Darwin, $(UNAME)))
HOST_OS=Darwin
endif
export HOST_OS NATIVE_PWD_OPT
# 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."
export DQUOTE
# 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) \
&& pwd $(PWD_OPT))
$(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 := $(SOURCE_DIR_PARENT) $(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:"%"=%)
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 $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
-Wno-missing-field-initializers -fno-delete-null-pointer-checks
endif
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
KBUILD_BUILTIN := 1
export KBUILD_BUILTIN
export KBUILD_CHECKSRC KBUILD_SRC
# Look for make include files relative to root of kernel src
MAKEFLAGS += --include-dir=$(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
CXX = $(CCACHE) $(CROSS_COMPILE)g++
else
CC ?= $(CROSS_COMPILE)gcc
CXX ?= $(CROSS_COMPILE)g++
endif
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
GDB = $(CROSS_COMPILE)gdb
READELF = $(CROSS_COMPILE)readelf
AWK = awk
ifeq ($(PREBUILT_HOST_TOOLS),)
FIXDEP = scripts/basic/fixdep
else
ifneq ($(filter host-tools, $(MAKECMDGOALS)),)
FIXDEP = scripts/basic/fixdep
else
FIXDEP = $(PREBUILT_HOST_TOOLS)/fixdep
endif
endif
PERL = perl
PYTHON = python
CHECK = sparse
CHECKFLAGS := -Wbitwise -Wno-return-void $(CF)
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
ifeq ($(COMPILER),clang)
ifneq ($(CROSS_COMPILE),)
CLANG_TARGET := -target $(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN := $(dir $(CROSS_COMPILE))
endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_GCC_TC := -gcc-toolchain $(GCC_TOOLCHAIN)
endif
ifneq ($(IA),1)
CLANG_IA_FLAG = -no-integrated-as
endif
CLANG_FLAGS := $(CLANG_TARGET) $(CLANG_GCC_TC) $(CLANG_IA_FLAG)
endif
# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE := -include $(CURDIR)/include/generated/autoconf.h
SOC_NAME = $(subst $(DQUOTE),,$(CONFIG_SOC))
SOC_SERIES = $(subst $(DQUOTE),,$(CONFIG_SOC_SERIES))
SOC_FAMILY = $(subst $(DQUOTE),,$(CONFIG_SOC_FAMILY))
override ARCH = $(subst $(DQUOTE),,$(CONFIG_ARCH))
BOARD_NAME = $(subst $(DQUOTE),,$(CONFIG_BOARD))
KERNEL_NAME = $(subst $(DQUOTE),,$(CONFIG_KERNEL_BIN_NAME))
KERNEL_ELF_NAME = $(KERNEL_NAME).elf
KERNEL_BIN_NAME = $(KERNEL_NAME).bin
KERNEL_HEX_NAME = $(KERNEL_NAME).hex
KERNEL_STAT_NAME = $(KERNEL_NAME).stat
PREBUILT_KERNEL = $(KERNEL_NAME)_prebuilt.elf
export SOC_FAMILY SOC_SERIES SOC_PATH SOC_NAME BOARD_NAME
export ARCH KERNEL_NAME KERNEL_ELF_NAME KERNEL_BIN_NAME KERNEL_HEX_NAME
# Use ZEPHYRINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
ZEPHYRINCLUDE = \
-I$(srctree)/kernel/include \
-I$(srctree)/arch/$(ARCH)/include \
-I$(srctree)/arch/$(ARCH)/soc/$(SOC_PATH) \
-I$(srctree)/arch/$(ARCH)/soc/$(SOC_FAMILY)/include \
-I$(srctree)/boards/$(ARCH)/$(BOARD_NAME) \
$(if $(KBUILD_SRC), -I$(srctree)/include) \
-I$(srctree)/include \
-I$(CURDIR)/include/generated \
$(USERINCLUDE) \
$(STDINCLUDE)
KBUILD_CPPFLAGS := -DKERNEL -D__ZEPHYR__=1
KBUILD_CFLAGS := -c -g -std=c99 \
-Wall \
-Wformat \
-Wformat-security \
-D_FORTIFY_SOURCE=2 \
-Wno-format-zero-length \
-Wno-main -ffreestanding
KBUILD_CXXFLAGS := -c -g -std=c++11 \
-fno-reorder-functions \
-fno-asynchronous-unwind-tables \
-fcheck-new \
-fno-defer-pop -Wall \
-Wno-unused-but-set-variable \
-Wno-format-zero-length \
-Wno-main -ffreestanding \
-ffunction-sections -fdata-sections \
-fno-rtti -fno-exceptions
KBUILD_AFLAGS := -c -g -xassembler-with-cpp -D_ASMLANGUAGE
LDFLAGS += $(call ld-option,-nostartfiles)
LDFLAGS += $(call ld-option,-nodefaultlibs)
LDFLAGS += $(call ld-option,-nostdlib)
LDFLAGS += $(call ld-option,-static)
KERNELVERSION = $(VERSION_MAJOR)$(if $(VERSION_MINOR),.$(VERSION_MINOR)$(if $(PATCHLEVEL),.$(PATCHLEVEL)))$(EXTRAVERSION)
exports += VERSION_MAJOR VERSION_MINOR PATCHLEVEL VERSION_RESERVED EXTRAVERSION
exports += KERNELRELEASE KERNELVERSION
exports += ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC CXX
exports += CPP AR NM STRIP OBJCOPY OBJDUMP GDB
exports += MAKE AWK PERL PYTHON
exports += HOSTCXX HOSTCXXFLAGS CHECK CHECKFLAGS
exports += KBUILD_CPPFLAGS NOSTDINC_FLAGS ZEPHYRINCLUDE OBJCOPYFLAGS LDFLAGS
exports += KBUILD_CFLAGS KBUILD_CXXFLAGS CFLAGS_GCOV KBUILD_AFLAGS AFLAGS_KERNEL
exports += KBUILD_ARFLAGS FIXDEP
# Push the exports to sub-processes
export $(exports)
# Make the exports available to third-party build systems
PHONY += outputexports
outputexports: Makefile.export
Makefile.export: include/config/auto.conf FORCE
$(call filechk,Makefile.export)
define filechk_Makefile.export
(echo "# file is auto-generated, do not modify !"; \
echo "BOARD=$(BOARD)"; \
echo; \
$(foreach e,$(exports),echo $(e)=$($(e));) echo; \
echo "include $(O)/include/config/auto.conf"; \
echo "include $(O)/include/generated/generated_dts_board.conf"; \
echo "-include $(srctree)/boards/$(ARCH)/$(BOARD_NAME)/Makefile.board";)
endef
# 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
ifeq ($(PREBUILT_HOST_TOOLS),)
scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic
else
scripts_basic:
endif
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;
PHONY += outputmakefile
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
outputmakefile:
ifneq ($(KBUILD_SRC),)
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
$(srctree) $(objtree) $(VERSION_MAJOR) $(VERSION_MINOR)
endif
# 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 kconfig-help host-tools \
cscope gtags TAGS tags help% %docs check% \
$(version_h) headers_% kernelversion %src-pkg
config-targets := 0
mixed-targets := 0
dot-config := 1
ifneq ($(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 $(srctree)/arch/$(subst $(DQUOTE),,$(CONFIG_ARCH))/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) $(build)=$(@)
# arch/ must be last here so that .gnu.linkonce magic for interrupts/exceptions
# works as expected
ifneq ($(strip $(MAKEFILE_APP_DIR)),)
MAKEFILE_APP := $(realpath $(MAKEFILE_APP_DIR)/Makefile.app)
endif
ifneq ($(strip $(PROJECT)),)
ifneq ($(strip $(MAKEFILE_APP)), )
include $(MAKEFILE_APP)
else
-include $(PROJECT)/Makefile.app
endif
ifneq ($(strip $(KBUILD_ZEPHYR_APP)),)
export KBUILD_ZEPHYR_APP
endif
app-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
# Read in DTS derived configuration, if it exists
#
# We check to see if the ARCH is correctly sourced before doing the -include
# The reason for this is due to implicit rules kicking in to create this file.
# If this occurs before the above auto.conf is sourced correctly, the build
# will iterate over the dts conf file 2-3 times before settling down to the
# correct output.
ifneq ($(ARCH),)
-include include/generated/generated_dts_board.conf
endif
# 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)
# kernel objects are built as a static library
libs-y := lib/ tests/
core-y := kernel/ drivers/ misc/ boards/ ext/ subsys/ arch/
ARCH = $(subst $(DQUOTE),,$(CONFIG_ARCH))
export ARCH
ifeq ($(CONFIG_DEBUG),y)
KBUILD_CFLAGS_OPTIMIZE := -Og
else
KBUILD_CFLAGS_OPTIMIZE := -Os
endif
ifdef ZEPHYR_GCC_VARIANT
include $(srctree)/scripts/Makefile.toolchain.$(ZEPHYR_GCC_VARIANT)
else
ifneq ($(MAKECMDGOALS),htmldocs)
$(if $(CROSS_COMPILE),, \
$(error ZEPHYR_GCC_VARIANT is not set. ))
endif
endif
# Let Makefile.toolchain adjust optimization level
KBUILD_CFLAGS += $(KBUILD_CFLAGS_OPTIMIZE)
-include $(srctree)/ext/Makefile
-include $(srctree)/lib/Makefile
ifneq ($(CC),)
ifeq ($(shell $(CC) -v 2>&1 | grep -Ec "clang version|icx version"), 1)
COMPILER := clang
else
COMPILER := gcc
endif
export COMPILER
endif
# 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
# Some GCC variants don't support these
KBUILD_CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,)
KBUILD_CFLAGS += $(call cc-option,-fno-pie,)
KBUILD_CFLAGS += $(call cc-option,-fno-pic,)
ifeq ($(CONFIG_STACK_CANARIES),y)
KBUILD_CFLAGS += $(call cc-option,-fstack-protector-all,)
else
KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector,)
endif
ifeq ($(CONFIG_OVERRIDE_FRAME_POINTER_DEFAULT),y)
ifeq ($(CONFIG_OMIT_FRAME_POINTER),y)
fp_arg := $(call cc-option,-fomit-frame-pointer,)
else
fp_arg := $(call cc-option,-fno-omit-frame-pointer,)
endif
endif
KBUILD_CFLAGS += $(fp_arg)
KBUILD_CXXFLAGS += $(fp_arg)
KBUILD_CFLAGS += $(subst $(DQUOTE),,$(CONFIG_COMPILER_OPT))
export LDFLAG_LINKERCMD
ifeq ($(SOC_SERIES),)
SOC_PATH = $(SOC_NAME)
else
SOC_PATH = $(SOC_FAMILY)/$(SOC_SERIES)
endif
include arch/$(ARCH)/Makefile
KBUILD_CFLAGS += $(CFLAGS)
KBUILD_CXXFLAGS += $(CXXFLAGS)
KBUILD_AFLAGS += $(CFLAGS)
ifeq ($(COMPILER),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
# Quiet clang warning: comparison of unsigned expression < 0 is always false
KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
else
# This warning generated too much noise in a regular build.
# Use make W=1 to enable this warning (see scripts/Makefile.build)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-functions)
ifneq (${ZEPHYR_GCC_VARIANT},xcc)
KBUILD_CFLAGS += $(call cc-option,-fno-defer-pop)
endif
endif
# 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)
NOSTDINC_FLAGS += -isystem $(shell $(CC) -print-file-name=include-fixed)
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.
ifdef CONFIG_STACK_USAGE
KBUILD_CFLAGS += $(call cc-option,-fstack-usage)
endif
# 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.
LINKFLAGPREFIX ?= -Wl,
LDFLAGS_zephyr += $(LDFLAGS)
LDFLAGS_zephyr += $(call cc-ldoption,-no-pie)
LDFLAGS_zephyr += $(call cc-ldoption,$(LINKFLAGPREFIX)-X)
LDFLAGS_zephyr += $(call cc-ldoption,$(LINKFLAGPREFIX)-N)
LDFLAGS_zephyr += $(call cc-ldoption,$(LINKFLAGPREFIX)--gc-sections)
LDFLAGS_zephyr += $(call cc-ldoption,$(LINKFLAGPREFIX)--build-id=none)
LD_TOOLCHAIN ?= -D__GCC_LINKER_CMD__
ifdef CONFIG_HAVE_CUSTOM_LINKER_SCRIPT
KBUILD_LDS := $(subst $(DQUOTE),,$(PROJECT_BASE)/$(CONFIG_CUSTOM_LINKER_SCRIPT))
ifeq ($(wildcard $(KBUILD_LDS)),)
KBUILD_LDS := $(subst $(DQUOTE),,$(CONFIG_CUSTOM_LINKER_SCRIPT))
endif
else
# Try a board specific linker file
KBUILD_LDS := $(srctree)/boards/$(ARCH)/$(BOARD_NAME)/linker.ld
# If not available, try an SoC specific linker file
ifeq ($(wildcard $(KBUILD_LDS)),)
KBUILD_LDS := $(srctree)/arch/$(ARCH)/soc/$(SOC_PATH)/linker.ld
endif
endif
export LD_TOOLCHAIN KBUILD_LDS
ifdef MAKEFILE_TOOLCHAIN_DO_PASS2
# KBUILD_CFLAGS known at this point.
# We can now determine which multilib libraries to use
include $(srctree)/scripts/Makefile.toolchain.$(ZEPHYR_GCC_VARIANT)
endif
# 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: $(KERNEL_BIN_NAME) $(KERNEL_STAT_NAME)
# Default kernel image to build when no specific target is given.
# KBUILD_IMAGE may be overruled on the command line or
# set in the environment
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
# this default value
export KBUILD_IMAGE ?= zephyr
zephyr-dirs := $(patsubst %/,%,$(filter %/,$(libs-y) $(core-y)))
# Workaround for some make notdir implementations that require
# the paramenter not to end in "/".
zephyr-app-dir-root-name := $(patsubst %/,%, $(SOURCE_DIR))
zephyr-app-dir-root := $(abspath $(patsubst %, %/.., $(SOURCE_DIR)))
zephyr-alldirs := $(sort $(zephyr-dirs) $(SOURCE_DIR) $(patsubst %/,%,$(filter %/, \
$(core-) $(drivers-) $(libs-) $(app-))))
core-y := $(patsubst %/, %/built-in.o, $(core-y)) kernel/lib.a
app-y := $(patsubst %, %/built-in.o, $(notdir $(zephyr-app-dir-root-name)))
libs-y := $(patsubst %/, %/built-in.o, $(libs-y))
# core-y must be last here. several arches use .gnu.linkonce magic
# to register interrupt or exception handlers, and defaults under
# arch/ (part of core-y) must be linked after drivers or libs.
export LDFLAGS_zephyr
zephyr-deps := $(KBUILD_LDS) $(core-y) $(libs-y) $(app-y)
ALL_LIBS += $(TOOLCHAIN_LIBS)
export ALL_LIBS
LINK_LIBS := $(foreach l,$(ALL_LIBS), -l$(l))
quiet_cmd_ar_target = AR $@
cmd_ar_target = rm -f $@; $(AR) rcT$(KBUILD_ARFLAGS) $@ $^
# Contains all the kernel-space objects except the kernel/lib.a which is
# linked outside of the --whole-archive directive with different AR
# parameters to save footprint space for unused kernel subsystems
libzephyr.a: $(filter-out %/lib.a, $(core-y))
$(call cmd,ar_target)
# All application objects and third party libraries which would be considered
# to not directly be part of the kernel (and hence whose symbols would not
# be globally marked as supervisor-only in memory protection scenarios)
libapplication.a: $(app-y) $(libs-y) $(KBUILD_ZEPHYR_APP)
$(call cmd,ar_target)
quiet_cmd_create-lnk = LINK $@
cmd_create-lnk = \
( \
echo $(LDFLAGS_zephyr); \
echo "$(LINKFLAGPREFIX)-Map=$(KERNEL_NAME).map"; \
echo "-L $(objtree)/include/generated"; \
echo "-u _OffsetAbsSyms -u _ConfigAbsSyms"; \
echo "-e __start"; \
echo "$(LINKFLAGPREFIX)--start-group"; \
echo "$(LINKFLAGPREFIX)--whole-archive"; \
echo "libapplication.a"; \
echo "libzephyr.a"; \
echo "$(LINKFLAGPREFIX)--no-whole-archive"; \
echo "$(filter %/lib.a, $(core-y))"; \
echo "$(objtree)/arch/$(ARCH)/core/offsets/offsets.o"; \
echo "$(LINKFLAGPREFIX)--end-group"; \
echo "$(LIB_INCLUDE_DIR) $(LINK_LIBS)"; \
) > $@
$(KERNEL_NAME).lnk: $(zephyr-deps)
$(call cmd,create-lnk)
linker.cmd: $(zephyr-deps)
$(Q)$(CC) -x assembler-with-cpp -nostdinc -undef -E -P \
$(LDFLAG_LINKERCMD) $(LD_TOOLCHAIN) \
-I$(srctree)/include -I$(SOURCE_DIR) \
-I$(objtree)/include/generated \
$(EXTRA_LINKER_CMD_OPT) $(KBUILD_LDS) -o $@
$(PREBUILT_KERNEL): $(zephyr-deps) libzephyr.a libapplication.a \
linker.cmd $(KERNEL_NAME).lnk
$(Q)$(CC) -T linker.cmd @$(KERNEL_NAME).lnk -o $@
ASSERT_WARNING_STR := \
"\n ------------------------------------------------------------" \
"\n --- WARNING: __ASSERT() statements are globally ENABLED ---" \
"\n --- The kernel will run more slowly and uses more memory ---" \
"\n ------------------------------------------------------------\n\n" \
WARN_ABOUT_ASSERT := $(if $(CONFIG_ASSERT),echo -e -n $(ASSERT_WARNING_STR),true)
DEPRECATION_WARNING_STR := \
"\n WARNING: The board '$(BOARD)' is deprecated and will be" \
"\n removed in version $(CONFIG_BOARD_DEPRECATED)\n\n"
WARN_ABOUT_DEPRECATION := $(if $(CONFIG_BOARD_DEPRECATED),echo -e \
-n $(DEPRECATION_WARNING_STR),true)
GENERATED_KERNEL_OBJECT_FILES :=
ifeq ($(ARCH),x86)
include $(srctree)/arch/x86/Makefile.idt
ifeq ($(CONFIG_X86_MMU),y)
include $(srctree)/arch/x86/Makefile.mmu
endif
ifeq ($(CONFIG_GDT_DYNAMIC),y)
include $(srctree)/arch/x86/Makefile.gdt
endif
endif
ifeq ($(CONFIG_GEN_ISR_TABLES),y)
include $(srctree)/arch/common/Makefile.gen_isr_tables
endif
ifeq ($(CONFIG_USERSPACE),y)
include $(srctree)/arch/common/Makefile.kobjects
endif
ifneq ($(GENERATED_KERNEL_OBJECT_FILES),)
# Identical rule to linker.cmd, but we also define preprocessor LINKER_PASS2.
# For arches that place special metadata in $(PREBUILT_KERNEL) not intended
# for the final binary, it can be #ifndef'd around this.
linker-pass2.cmd: $(zephyr-deps)
$(Q)$(CC) -x assembler-with-cpp -nostdinc -undef -E -P \
-DLINKER_PASS2 \
$(LDFLAG_LINKERCMD) $(LD_TOOLCHAIN) \
-I$(srctree)/include -I$(SOURCE_DIR) \
-I$(objtree)/include/generated \
$(EXTRA_LINKER_CMD_OPT) $(KBUILD_LDS) -o $@
$(KERNEL_ELF_NAME): $(GENERATED_KERNEL_OBJECT_FILES) linker-pass2.cmd
$(Q)$(CC) -T linker-pass2.cmd $(GENERATED_KERNEL_OBJECT_FILES) \
@$(KERNEL_NAME).lnk -o $@
$(Q)$(srctree)/scripts/check_link_map.py $(KERNEL_NAME).map
@$(WARN_ABOUT_ASSERT)
@$(WARN_ABOUT_DEPRECATION)
else # GENERATED_KERNEL_OBJECT_FILES
# Otherwise, nothing to do, prebuilt kernel is the real one
$(KERNEL_ELF_NAME): $(PREBUILT_KERNEL)
$(Q)cp $(PREBUILT_KERNEL) $(KERNEL_ELF_NAME)
$(Q)$(srctree)/scripts/check_link_map.py $(KERNEL_NAME).map
@$(WARN_ABOUT_ASSERT)
@$(WARN_ABOUT_DEPRECATION)
endif
quiet_cmd_gen_bin = BIN $@
cmd_gen_bin = \
( \
$(OBJDUMP) -S $< > $(KERNEL_NAME).lst; \
$(OBJCOPY) -S -O binary -R .note -R .comment -R COMMON -R .eh_frame $< $@; \
$(STRIP) -s -o $(KERNEL_NAME).strip $<; \
)
$(KERNEL_BIN_NAME): $(KERNEL_ELF_NAME)
$(call cmd,gen_bin)
quiet_cmd_gen_hex = HEX $@
cmd_gen_hex = \
( \
$(OBJCOPY) -S -O ihex -R .note -R .comment -R COMMON -R .eh_frame $< $@; \
)
$(KERNEL_HEX_NAME): $(KERNEL_ELF_NAME)
$(call cmd,gen_hex)
$(KERNEL_STAT_NAME): $(KERNEL_BIN_NAME) $(KERNEL_ELF_NAME)
@$(READELF) -e $(KERNEL_ELF_NAME) > $@
ram_report: $(KERNEL_STAT_NAME)
@$(srctree)/scripts/footprint/size_report -r -o $(O)
rom_report: $(KERNEL_STAT_NAME)
@$(srctree)/scripts/footprint/size_report -F -o $(O)
zephyr: $(zephyr-deps) $(KERNEL_BIN_NAME)
ifeq ($(CONFIG_HAS_DTS),y)
define filechk_generated_dts_board.h
(echo "/* WARNING. THIS FILE IS AUTO-GENERATED. DO NOT MODIFY! */"; \
if test -e $(ZEPHYR_BASE)/dts/$(ARCH)/$(BOARD_NAME).fixup; then \
$(ZEPHYR_BASE)/scripts/dts/extract_dts_includes.py \
-d dts/$(ARCH)/$(BOARD_NAME).dts_compiled \
-y $(ZEPHYR_BASE)/dts/bindings \
-f $(ZEPHYR_BASE)/dts/$(ARCH)/$(BOARD_NAME).fixup; \
else \
$(ZEPHYR_BASE)/scripts/dts/extract_dts_includes.py \
-d dts/$(ARCH)/$(BOARD_NAME).dts_compiled \
-y $(ZEPHYR_BASE)/dts/bindings; \
fi; \
)
endef
define filechk_generated_dts_board.conf
(echo "# WARNING. THIS FILE IS AUTO-GENERATED. DO NOT MODIFY!"; \
$(ZEPHYR_BASE)/scripts/dts/extract_dts_includes.py \
-d dts/$(ARCH)/$(BOARD_NAME).dts_compiled \
-y $(ZEPHYR_BASE)/dts/bindings -k; \
)
endef
else
define filechk_generated_dts_board.h
(echo "/* WARNING. THIS FILE IS AUTO-GENERATED. DO NOT MODIFY! */";)