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#
# (C) Copyright 2000-2013
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# SPDX-License-Identifier: GPL-2.0+
#
VERSION = 2014
PATCHLEVEL = 01
SUBLEVEL =
EXTRAVERSION =
NAME =
# *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.
# Do not:
# o use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour);
# o print "Entering directory ...";
MAKEFLAGS += -rR --no-print-directory
# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC
# 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 vmlinux), 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.
# 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 = $(V)
endif
ifndef KBUILD_VERBOSE
KBUILD_VERBOSE = 0
endif
# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
# See the file "Documentation/sparse.txt" for more details, including
# where to get the "sparse" utility.
ifeq ("$(origin C)", "command line")
KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
KBUILD_CHECKSRC = 0
endif
# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
KBUILD_EXTMOD ?= $(SUBDIRS)
endif
ifeq ("$(origin M)", "command line")
KBUILD_EXTMOD := $(M)
endif
# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
#
# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.
# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(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 := $(O)
endif
ifeq ("$(origin W)", "command line")
export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
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 cd $(KBUILD_OUTPUT) && /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
$(error output directory "$(saved-output)" does not exist))
PHONY += $(MAKECMDGOALS) sub-make
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
@:
sub-make: FORCE
$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
KBUILD_SRC=$(CURDIR) \
KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -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 ($(skip-makefile),)
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif
srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
objtree := $(CURDIR)
src := $(srctree)
obj := $(objtree)
VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
export srctree objtree VPATH
OBJTREE := $(objtree)
SPLTREE := $(OBJTREE)/spl
TPLTREE := $(OBJTREE)/tpl
SRCTREE := $(srctree)
TOPDIR := $(SRCTREE)
export TOPDIR SRCTREE OBJTREE SPLTREE TPLTREE
MKCONFIG := $(SRCTREE)/mkconfig
export MKCONFIG
# Make sure CDPATH settings don't interfere
unexport CDPATH
#########################################################################
TIMESTAMP_FILE = include/generated/timestamp_autogenerated.h
VERSION_FILE = include/generated/version_autogenerated.h
HOSTARCH := $(shell uname -m | \
sed -e s/i.86/x86/ \
-e s/sun4u/sparc64/ \
-e s/arm.*/arm/ \
-e s/sa110/arm/ \
-e s/ppc64/powerpc/ \
-e s/ppc/powerpc/ \
-e s/macppc/powerpc/\
-e s/sh.*/sh/)
HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
sed -e 's/\(cygwin\).*/cygwin/')
export HOSTARCH HOSTOS
# Deal with colliding definitions from tcsh etc.
VENDOR=
#########################################################################
# set default to nothing for native builds
ifeq ($(HOSTARCH),$(ARCH))
CROSS_COMPILE ?=
endif
# 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
HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
ifeq ($(HOSTOS),cygwin)
HOSTCFLAGS += -ansi
endif
# Mac OS X / Darwin's C preprocessor is Apple specific. It
# generates numerous errors and warnings. We want to bypass it
# and use GNU C's cpp. To do this we pass the -traditional-cpp
# option to the compiler. Note that the -traditional-cpp flag
# DOES NOT have the same semantics as GNU C's flag, all it does
# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
#
# Apple's linker is similar, thanks to the new 2 stage linking
# multiple symbol definitions are treated as errors, hence the
# -multiply_defined suppress option to turn off this error.
#
ifeq ($(HOSTOS),darwin)
# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.')
DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.')
os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
# Snow Leopards build environment has no longer restrictions as described above
HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc")
HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
endif
# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
KBUILD_MODULES :=
KBUILD_BUILTIN := 1
# If we have only "make modules", don't compile built-in objects.
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.
ifeq ($(MAKECMDGOALS),modules)
KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif
# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well
# U-Boot does not need modules
#ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
# KBUILD_MODULES := 1
#endif
#ifeq ($(MAKECMDGOALS),)
# KBUILD_MODULES := 1
#endif
export KBUILD_MODULES KBUILD_BUILTIN
export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
# 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 $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
# If the user is running make -s (silent mode), suppress echoing of
# commands
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
quiet=silent_
endif
export quiet Q KBUILD_VERBOSE
# 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
# Make variables (CC, etc...)
AS = $(CROSS_COMPILE)as
# Always use GNU ld
ifneq ($(shell $(CROSS_COMPILE)ld.bfd -v 2> /dev/null),)
LD = $(CROSS_COMPILE)ld.bfd
else
LD = $(CROSS_COMPILE)ld
endif
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
LDR = $(CROSS_COMPILE)ldr
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
AWK = awk
RANLIB = $(CROSS_COMPILE)RANLIB
DTC = dtc
CHECK = sparse
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
KBUILD_CPPFLAGS := -D__KERNEL__
KBUILD_CFLAGS := -Wall -Wstrict-prototypes \
-Wno-format-security \
-fno-builtin -ffreestanding
KBUILD_AFLAGS := -D__ASSEMBLY__
U_BOOT_VERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL U_BOOT_VERSION
export ARCH CPU BOARD VENDOR SOC
export CONFIG_SHELL HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM LDR STRIP OBJCOPY OBJDUMP
export MAKE AWK
export DTC CHECK CHECKFLAGS
export KBUILD_CPPFLAGS NOSTDINC_FLAGS UBOOTINCLUDE
export KBUILD_CFLAGS KBUILD_AFLAGS
# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
# Files to ignore in find ... statements
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
$(Q)rm -f .tmp_quiet_recordmcount
# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;
# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).
no-dot-config-targets := clean clobber mrproper distclean \
cscope TAGS %tags help %docs check% coccicheck \
backup
config-targets := 0
mixed-targets := 0
dot-config := 1
ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
dot-config := 0
endif
endif
ifeq ($(KBUILD_EXTMOD),)
ifneq ($(filter config %config,$(MAKECMDGOALS)),)
config-targets := 1
ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
mixed-targets := 1
endif
endif
endif
ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.
%:: FORCE
$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
else
ifeq ($(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'
%_config::
@$(MKCONFIG) -A $(@:_config=)
else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.
# load ARCH, BOARD, and CPU configuration
-include include/config.mk
ifeq ($(dot-config),1)
# Read in config
-include include/autoconf.mk
-include include/autoconf.mk.dep
# load other configuration
include $(srctree)/config.mk
ifeq ($(wildcard include/config.mk),)
$(error "System not configured - see README")
endif
ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
$(error Your architecture does not support generic board. \
Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
endif
endif
# If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
# that (or fail if absent). Otherwise, search for a linker script in a
# standard location.
LDSCRIPT_MAKEFILE_DIR = $(dir $(LDSCRIPT))
ifndef LDSCRIPT
#LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
ifdef CONFIG_SYS_LDSCRIPT
# need to strip off double quotes
LDSCRIPT := $(CONFIG_SYS_LDSCRIPT:"%"=%)
endif
endif
# If there is no specified link script, we look in a number of places for it
ifndef LDSCRIPT
ifeq ($(CONFIG_NAND_U_BOOT),y)
LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
endif
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot.lds
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(TOPDIR)/arch/$(ARCH)/cpu/u-boot.lds
# We don't expect a Makefile here
LDSCRIPT_MAKEFILE_DIR =
endif
ifeq ($(wildcard $(LDSCRIPT)),)
$(error could not find linker script)
endif
endif
else
endif # $(dot-config)
KBUILD_CFLAGS += -Os #-fomit-frame-pointer
ifdef BUILD_TAG
KBUILD_CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
endif
KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
KBUILD_CFLAGS += -g
# $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
# option to the assembler.
KBUILD_AFLAGS += -g
# Report stack usage if supported
KBUILD_CFLAGS += $(call cc-option,-fstack-usage)
KBUILD_CFLAGS += $(call cc-option,-Wno-format-nonliteral)
# turn jbsr into jsr for m68k
ifeq ($(ARCH),m68k)
ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
KBUILD_AFLAGS += -Wa,-gstabs,-S
endif
endif
ifneq ($(CONFIG_SYS_TEXT_BASE),)
KBUILD_CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
endif
export CONFIG_SYS_TEXT_BASE
# Use UBOOTINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
UBOOTINCLUDE :=
ifneq ($(OBJTREE),$(SRCTREE))
UBOOTINCLUDE += -I$(OBJTREE)/include
endif
UBOOTINCLUDE += -I$(srctree)/include \
-I$(srctree)/arch/$(ARCH)/include
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)
# FIX ME
cpp_flags := $(KBUILD_CPPFLAGS) $(CPPFLAGS) $(UBOOTINCLUDE) $(NOSTDINC_FLAGS)
c_flags := $(KBUILD_CFLAGS) $(cpp_flags)
.PHONY : $(VERSION_FILE) $(TIMESTAMP_FILE)
#########################################################################
# U-Boot objects....order is important (i.e. start must be first)
head-y := $(CPUDIR)/start.o
head-$(CONFIG_4xx) += arch/powerpc/cpu/ppc4xx/resetvec.o
head-$(CONFIG_MPC85xx) += arch/powerpc/cpu/mpc85xx/resetvec.o
HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(srctree)/board/$(VENDOR)/common/Makefile),y,n)
libs-y += lib/
libs-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/
libs-y += $(CPUDIR)/
ifdef SOC
libs-y += $(CPUDIR)/$(SOC)/
endif
libs-$(CONFIG_IXP4XX_NPE) += drivers/net/npe/
libs-$(CONFIG_OF_EMBED) += dts/
libs-y += arch/$(ARCH)/lib/
libs-y += fs/
libs-y += net/
libs-y += disk/
libs-y += drivers/
libs-y += drivers/dma/
libs-y += drivers/gpio/
libs-y += drivers/i2c/
libs-y += drivers/input/
libs-y += drivers/mmc/
libs-y += drivers/mtd/
libs-$(CONFIG_CMD_NAND) += drivers/mtd/nand/
libs-y += drivers/mtd/onenand/
libs-$(CONFIG_CMD_UBI) += drivers/mtd/ubi/
libs-y += drivers/mtd/spi/
libs-y += drivers/net/
libs-y += drivers/net/phy/
libs-y += drivers/pci/
libs-y += drivers/power/ \
drivers/power/fuel_gauge/ \
drivers/power/mfd/ \
drivers/power/pmic/ \
drivers/power/battery/
libs-y += drivers/spi/
libs-$(CONFIG_FMAN_ENET) += drivers/net/fm/
libs-$(CONFIG_SYS_FSL_DDR) += drivers/ddr/fsl/
libs-y += drivers/serial/
libs-y += drivers/usb/eth/
libs-y += drivers/usb/gadget/
libs-y += drivers/usb/host/
libs-y += drivers/usb/musb/
libs-y += drivers/usb/musb-new/
libs-y += drivers/usb/phy/
libs-y += drivers/usb/ulpi/
libs-y += common/
libs-y += lib/libfdt/
libs-$(CONFIG_API) += api/
libs-$(CONFIG_HAS_POST) += post/
libs-y += test/
ifneq (,$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35 mxs vf610))
libs-y += arch/$(ARCH)/imx-common/
endif
libs-$(CONFIG_ARM) += arch/arm/cpu/
libs-$(CONFIG_PPC) += arch/powerpc/cpu/
libs-y += board/$(BOARDDIR)/
libs-y := $(sort $(libs-y))
u-boot-dirs := $(patsubst %/,%,$(filter %/, $(libs-y))) tools examples
u-boot-alldirs := $(sort $(u-boot-dirs) $(patsubst %/,%,$(filter %/, $(libs-))))
libs-y := $(patsubst %/, %/built-in.o, $(libs-y))
u-boot-init := $(head-y)
u-boot-main := $(libs-y)
# Add GCC lib
ifdef USE_PRIVATE_LIBGCC
ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
PLATFORM_LIBGCC = $(OBJTREE)/arch/$(ARCH)/lib/lib.a
else
PLATFORM_LIBGCC = -L $(USE_PRIVATE_LIBGCC) -lgcc
endif
else
PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(c_flags) -print-libgcc-file-name`) -lgcc
endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)
export PLATFORM_LIBS
# Special flags for CPP when processing the linker script.
# Pass the version down so we can handle backwards compatibility
# on the fly.
LDPPFLAGS += \
-include $(TOPDIR)/include/u-boot/u-boot.lds.h \
-DCPUDIR=$(CPUDIR) \
$(shell $(LD) --version | \
sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
#########################################################################
#########################################################################
ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
BOARD_SIZE_CHECK = \
@actual=`wc -c $@ | awk '{print $$1}'`; \
limit=`printf "%d" $(CONFIG_BOARD_SIZE_LIMIT)`; \
if test $$actual -gt $$limit; then \
echo "$@ exceeds file size limit:" >&2 ; \
echo " limit: $$limit bytes" >&2 ; \
echo " actual: $$actual bytes" >&2 ; \
echo " excess: $$((actual - limit)) bytes" >&2; \
exit 1; \
fi
else
BOARD_SIZE_CHECK =
endif
# Statically apply RELA-style relocations (currently arm64 only)
ifneq ($(CONFIG_STATIC_RELA),)
# $(1) is u-boot ELF, $(2) is u-boot bin, $(3) is text base
DO_STATIC_RELA = \
start=$$($(NM) $(1) | grep __rel_dyn_start | cut -f 1 -d ' '); \
end=$$($(NM) $(1) | grep __rel_dyn_end | cut -f 1 -d ' '); \
tools/relocate-rela $(2) $(3) $$start $$end
else
DO_STATIC_RELA =
endif
# Always append ALL so that arch config.mk's can add custom ones
ALL-y += u-boot.srec u-boot.bin System.map
ALL-$(CONFIG_NAND_U_BOOT) += u-boot-nand.bin
ALL-$(CONFIG_ONENAND_U_BOOT) += u-boot-onenand.bin
ALL-$(CONFIG_RAMBOOT_PBL) += u-boot.pbl
ALL-$(CONFIG_SPL) += spl/u-boot-spl.bin
ALL-$(CONFIG_SPL_FRAMEWORK) += u-boot.img
ALL-$(CONFIG_TPL) += tpl/u-boot-tpl.bin
ALL-$(CONFIG_OF_SEPARATE) += u-boot.dtb u-boot-dtb.bin
ifneq ($(CONFIG_SPL_TARGET),)
ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
endif
ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
# enable combined SPL/u-boot/dtb rules for tegra
ifneq ($(CONFIG_TEGRA),)
ifeq ($(CONFIG_SPL),y)
ifeq ($(CONFIG_OF_SEPARATE),y)
ALL-y += u-boot-dtb-tegra.bin
else
ALL-y += u-boot-nodtb-tegra.bin
endif
endif
endif
LDFLAGS_u-boot += -T u-boot.lds $(LDFLAGS_FINAL)
ifneq ($(CONFIG_SYS_TEXT_BASE),)
LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
endif
all: $(ALL-y)
u-boot.dtb: checkdtc u-boot
$(MAKE) $(build)=dts binary
mv dts/dt.dtb $@
u-boot-dtb.bin: u-boot.bin u-boot.dtb
cat $^ >$@
u-boot.hex: u-boot
$(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@
u-boot.srec: u-boot
$(OBJCOPY) ${OBJCFLAGS} -O srec $< $@
u-boot.bin: u-boot
$(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
$(call DO_STATIC_RELA,$<,$@,$(CONFIG_SYS_TEXT_BASE))
$(BOARD_SIZE_CHECK)
u-boot.ldr: u-boot
$(CREATE_LDR_ENV)
$(LDR) -T $(CONFIG_BFIN_CPU) -c $@ $< $(LDR_FLAGS)
$(BOARD_SIZE_CHECK)
u-boot.ldr.hex: u-boot.ldr
$(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@ -I binary
u-boot.ldr.srec: u-boot.ldr
$(OBJCOPY) ${OBJCFLAGS} -O srec $< $@ -I binary
#
# U-Boot entry point, needed for booting of full-blown U-Boot
# from the SPL U-Boot version.
#
ifndef CONFIG_SYS_UBOOT_START
CONFIG_SYS_UBOOT_START := 0
endif
u-boot.img: u-boot.bin
tools/mkimage -A $(ARCH) -T firmware -C none \
-O u-boot -a $(CONFIG_SYS_TEXT_BASE) \
-e $(CONFIG_SYS_UBOOT_START) \
-n $(shell sed -n -e 's/.*U_BOOT_VERSION//p' $(VERSION_FILE) | \
sed -e 's/"[ ]*$$/ for $(BOARD) board"/') \
-d $< $@
u-boot.imx: u-boot.bin
$(MAKE) $(build)=arch/arm/imx-common $(objtree)/u-boot.imx
u-boot.kwb: u-boot.bin
tools/mkimage -n $(CONFIG_SYS_KWD_CONFIG) -T kwbimage \
-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) -d $< $@
u-boot.pbl: u-boot.bin
tools/mkimage -n $(CONFIG_SYS_FSL_PBL_RCW) \
-R $(CONFIG_SYS_FSL_PBL_PBI) -T pblimage \
-d $< $@
u-boot.sha1: u-boot.bin
tools/ubsha1 u-boot.bin
u-boot.dis: u-boot
$(OBJDUMP) -d $< > $@
# $@ is output, $(1) and $(2) are inputs, $(3) is padded intermediate,
# $(4) is pad-to
SPL_PAD_APPEND = \
$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(4) -I binary -O binary \
$(1) $(3); \
cat $(3) $(2) > $@; \
rm $(3)
ifdef CONFIG_TPL
SPL_PAYLOAD := tpl/u-boot-with-tpl.bin
else
SPL_PAYLOAD := u-boot.bin
endif
u-boot-with-spl.bin: spl/u-boot-spl.bin $(SPL_PAYLOAD)
$(call SPL_PAD_APPEND,$<,$(SPL_PAYLOAD),spl/u-boot-spl-pad.bin,$(CONFIG_SPL_PAD_TO))
tpl/u-boot-with-tpl.bin: tpl/u-boot-tpl.bin u-boot.bin
$(call SPL_PAD_APPEND,$<,u-boot.bin,tpl/u-boot-tpl-pad.bin,$(CONFIG_TPL_PAD_TO))
u-boot-with-spl.imx: spl/u-boot-spl.bin u-boot.bin
$(MAKE) $(build)=arch/arm/imx-common \
$(OBJTREE)/u-boot-with-spl.imx
u-boot-with-nand-spl.imx: spl/u-boot-spl.bin u-boot.bin
$(MAKE) $(build)=arch/arm/imx-common \
$(OBJTREE)/u-boot-with-nand-spl.imx
u-boot.ubl: u-boot-with-spl.bin
tools/mkimage -n $(UBL_CONFIG) -T ublimage \
-e $(CONFIG_SYS_TEXT_BASE) -d $< u-boot.ubl
u-boot.ais: spl/u-boot-spl.bin u-boot.img
tools/mkimage -s -n $(if $(CONFIG_AIS_CONFIG_FILE),$(srctree)/$(CONFIG_AIS_CONFIG_FILE:"%"=%),"/dev/null") \
-T aisimage \
-e $(CONFIG_SPL_TEXT_BASE) \
-d spl/u-boot-spl.bin \
spl/u-boot-spl.ais
$(OBJCOPY) ${OBJCFLAGS} -I binary \
--pad-to=$(CONFIG_SPL_MAX_SIZE) -O binary \
spl/u-boot-spl.ais spl/u-boot-spl-pad.ais
cat spl/u-boot-spl-pad.ais u-boot.img > u-boot.ais
u-boot.sb: u-boot.bin spl/u-boot-spl.bin
$(MAKE) $(build)=$(CPUDIR)/$(SOC)/ $(OBJTREE)/u-boot.sb
# On x600 (SPEAr600) U-Boot is appended to U-Boot SPL.
# Both images are created using mkimage (crc etc), so that the ROM
# bootloader can check its integrity. Padding needs to be done to the
# SPL image (with mkimage header) and not the binary. Otherwise the resulting image
# which is loaded/copied by the ROM bootloader to SRAM doesn't fit.
# The resulting image containing both U-Boot images is called u-boot.spr
u-boot.spr: u-boot.img spl/u-boot-spl.bin
tools/mkimage -A $(ARCH) -T firmware -C none \
-a $(CONFIG_SPL_TEXT_BASE) -e $(CONFIG_SPL_TEXT_BASE) -n XLOADER \
-d spl/u-boot-spl.bin $@
$(OBJCOPY) -I binary -O binary \
--pad-to=$(CONFIG_SPL_PAD_TO) --gap-fill=0xff $@
cat u-boot.img >> $@
ifneq ($(CONFIG_TEGRA),)
u-boot-nodtb-tegra.bin: spl/u-boot-spl.bin u-boot.bin
$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary spl/u-boot-spl spl/u-boot-spl-pad.bin
cat spl/u-boot-spl-pad.bin u-boot.bin > $@
rm spl/u-boot-spl-pad.bin
ifeq ($(CONFIG_OF_SEPARATE),y)
u-boot-dtb-tegra.bin: u-boot-nodtb-tegra.bin u-boot.dtb
cat u-boot-nodtb-tegra.bin u-boot.dtb > $@
endif
endif
u-boot-img.bin: spl/u-boot-spl.bin u-boot.img
cat spl/u-boot-spl.bin u-boot.img > $@
# PPC4xx needs the SPL at the end of the image, since the reset vector
# is located at 0xfffffffc. So we can't use the "u-boot-img.bin" target
# and need to introduce a new build target with the full blown U-Boot
# at the start padded up to the start of the SPL image. And then concat
# the SPL image to the end.
u-boot-img-spl-at-end.bin: spl/u-boot-spl.bin u-boot.img
$(OBJCOPY) -I binary -O binary --pad-to=$(CONFIG_UBOOT_PAD_TO) \
--gap-fill=0xff u-boot.img $@
cat spl/u-boot-spl.bin >> $@
# Create a new ELF from a raw binary file. This is useful for arm64
# where static relocation needs to be performed on the raw binary,
# but certain simulators only accept an ELF file (but don't do the
# relocation).
# FIXME refactor dts/Makefile to share target/arch detection
u-boot.elf: u-boot.bin
@$(OBJCOPY) -B aarch64 -I binary -O elf64-littleaarch64 \
$< u-boot-elf.o
@$(LD) u-boot-elf.o -o $@ \
--defsym=_start=$(CONFIG_SYS_TEXT_BASE) \
-Ttext=$(CONFIG_SYS_TEXT_BASE)
ifeq ($(CONFIG_SANDBOX),y)
GEN_UBOOT = \
$(CC) $(SYMS) -T u-boot.lds \
-Wl,--start-group $(u-boot-main) -Wl,--end-group \
$(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map -o u-boot
else
GEN_UBOOT = \
$(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) \
$(u-boot-init) \
--start-group $(u-boot-main) --end-group $(PLATFORM_LIBS) \
-Map u-boot.map -o u-boot
endif
u-boot: $(u-boot-init) $(u-boot-main) u-boot.lds
$(GEN_UBOOT)
ifeq ($(CONFIG_KALLSYMS),y)
smap=`$(call SYSTEM_MAP,u-boot) | \
awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\\\000"}'` ; \
$(CC) $(c_flags) -DSYSTEM_MAP="\"$${smap}\"" \
-c $(srctree)/common/system_map.c -o common/system_map.o
$(GEN_UBOOT) common/system_map.o
endif
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(u-boot-init) $(u-boot-main)): $(u-boot-dirs) ;
# Handle descending into subdirectories listed in $(vmlinux-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 += $(u-boot-dirs)
$(u-boot-dirs): depend scripts_basic
$(Q)$(MAKE) $(build)=$@
tools: $(TIMESTAMP_FILE) $(VERSION_FILE)
# The "tools" are needed early
$(filter-out tools, $(u-boot-dirs)): tools
# The "examples" conditionally depend on U-Boot (say, when USE_PRIVATE_LIBGCC
# is "yes"), so compile examples after U-Boot is compiled.
examples: $(filter-out examples, $(u-boot-dirs))
#
# Auto-generate the autoconf.mk file (which is included by all makefiles)
#
# This target actually generates 2 files; autoconf.mk and autoconf.mk.dep.
# the dep file is only include in this top level makefile to determine when
# to regenerate the autoconf.mk file.
quiet_cmd_autoconf_dep = GEN $@
cmd_autoconf_dep = $(CC) -x c -DDO_DEPS_ONLY -M $(c_flags) \
-MQ include/autoconf.mk $(srctree)/include/common.h > $@ || rm $@
include/autoconf.mk.dep: include/config.h include/common.h
$(call cmd,autoconf_dep)
quiet_cmd_autoconf = GEN $@
cmd_autoconf = \
$(CPP) $(c_flags) -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
rm $@.tmp
include/autoconf.mk: include/config.h
$(call cmd,autoconf)
u-boot.lds: $(LDSCRIPT) depend
$(CPP) $(cpp_flags) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$< >$@
nand_spl: $(TIMESTAMP_FILE) $(VERSION_FILE) depend scripts_basic
$(MAKE) $(build)=nand_spl/board/$(BOARDDIR) all
u-boot-nand.bin: nand_spl u-boot.bin
cat nand_spl/u-boot-spl-16k.bin u-boot.bin > u-boot-nand.bin
spl/u-boot-spl.bin: tools depend scripts_basic
$(MAKE) obj=spl -f $(srctree)/spl/Makefile all
tpl/u-boot-tpl.bin: tools depend scripts_basic
$(MAKE) obj=tpl -f $(srctree)/spl/Makefile all CONFIG_TPL_BUILD=y
# Explicitly make _depend in subdirs containing multiple targets to prevent
# parallel sub-makes creating .depend files simultaneously.
depend dep: $(TIMESTAMP_FILE) $(VERSION_FILE) \
include/generated/generic-asm-offsets.h \
include/generated/asm-offsets.h
TAG_SUBDIRS := $(u-boot-dirs) include
FIND := find
FINDFLAGS := -L
PHONY += checkstack
checkstack:
$(OBJDUMP) -d u-boot $$(find . -name u-boot-spl) | \
$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
tags ctags:
ctags -w -o ctags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
-name '*.[chS]' -print`
etags:
etags -a -o $(obj)etags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
-name '*.[chS]' -print`
cscope:
$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) -name '*.[chS]' -print > \
cscope.files
cscope -b -q -k
SYSTEM_MAP = \
$(NM) $1 | \
grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
LC_ALL=C sort
System.map: u-boot
@$(call SYSTEM_MAP,$<) > $@
checkthumb:
@if test $(call cc-version) -lt 0404; then \
echo -n '*** Your GCC does not produce working '; \
echo 'binaries in THUMB mode.'; \
echo '*** Your board is configured for THUMB mode.'; \
false; \
fi
# GCC 3.x is reported to have problems generating the type of relocation
# that U-Boot wants.
# See http://lists.denx.de/pipermail/u-boot/2012-September/135156.html
checkgcc4:
@if test $(call cc-version) -lt 0400; then \
echo -n '*** Your GCC is too old, please upgrade to GCC 4.x or newer'; \
false; \
fi
checkdtc:
@if test $(call dtc-version) -lt 0104; then \
echo '*** Your dtc is too old, please upgrade to dtc 1.4 or newer'; \
false; \
fi
quiet_cmd_offsets = GEN $@
cmd_offsets = $(srctree)/tools/scripts/make-asm-offsets $< $@
include/generated/generic-asm-offsets.h: lib/asm-offsets.s
$(call cmd,offsets)
quiet_cmd_asm-offsets.s = CC $@
cmd_asm-offsets.s = mkdir -p lib; \
$(CC) -DDO_DEPS_ONLY \
$(c_flags) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
-o $@ $< -c -S
lib/asm-offsets.s: $(srctree)/lib/asm-offsets.c include/config.h
$(call cmd,asm-offsets.s)
include/generated/asm-offsets.h: $(CPUDIR)/$(SOC)/asm-offsets.s
$(call cmd,offsets)
quiet_cmd_soc_asm-offsets.s = CC $@
cmd_soc_asm-offsets.s = mkdir -p $(CPUDIR)/$(SOC); \
if [ -f $(srctree)/$(CPUDIR)/$(SOC)/asm-offsets.c ];then \
$(CC) -DDO_DEPS_ONLY \
$(c_flags) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
-o $@ $(srctree)/$(CPUDIR)/$(SOC)/asm-offsets.c -c -S; \
else \
touch $@; \
fi
$(CPUDIR)/$(SOC)/asm-offsets.s: include/config.h
$(call cmd,soc_asm-offsets.s)
#########################################################################
# ARM relocations should all be R_ARM_RELATIVE (32-bit) or
# R_AARCH64_RELATIVE (64-bit).
checkarmreloc: u-boot
@RELOC="`$(CROSS_COMPILE)readelf -r -W $< | cut -d ' ' -f 4 | \
grep R_A | sort -u`"; \
if test "$$RELOC" != "R_ARM_RELATIVE" -a \
"$$RELOC" != "R_AARCH64_RELATIVE"; then \
echo "$< contains unexpected relocations: $$RELOC"; \
false; \
fi
$(VERSION_FILE):
@mkdir -p $(dir $(VERSION_FILE))
@( localvers='$(shell $(TOPDIR)/scripts/setlocalversion $(TOPDIR))' ; \
printf '#define PLAIN_VERSION "%s%s"\n' \
"$(U_BOOT_VERSION)" "$${localvers}" ; \
printf '#define U_BOOT_VERSION "U-Boot %s%s"\n' \
"$(U_BOOT_VERSION)" "$${localvers}" ; \
) > $@.tmp
@( printf '#define CC_VERSION_STRING "%s"\n' \
'$(shell $(CC) --version | head -n 1)' )>> $@.tmp
@( printf '#define LD_VERSION_STRING "%s"\n' \
'$(shell $(LD) -v | head -n 1)' )>> $@.tmp
@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
$(TIMESTAMP_FILE):
@mkdir -p $(dir $(TIMESTAMP_FILE))
@LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"' > $@.tmp
@LC_ALL=C date +'#define U_BOOT_TIME "%T"' >> $@.tmp
@cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
env: depend scripts_basic
$(Q)$(MAKE) $(build)=tools/$@
xmldocs pdfdocs psdocs htmldocs mandocs: tools/kernel-doc/docproc
$(Q)$(MAKE) U_BOOT_VERSION=$(U_BOOT_VERSION) $(build)=doc/DocBook $@
tools-all: HOST_TOOLS_ALL=y
tools-all: env tools ;
.PHONY : CHANGELOG
CHANGELOG:
git log --no-merges U-Boot-1_1_5.. | \
unexpand -a | sed -e 's/\s\s*$$//' > $@
include/license.h: tools/bin2header COPYING
cat COPYING | gzip -9 -c | ./tools/bin2header license_gzip > include/license.h
#########################################################################
#########################################################################
clean:
@rm -f examples/standalone/atmel_df_pow2 \
examples/standalone/hello_world \
examples/standalone/interrupt \
examples/standalone/mem_to_mem_idma2intr \
examples/standalone/sched \
$(addprefix examples/standalone/, smc91111_eeprom smc911x_eeprom) \
examples/standalone/test_burst \
examples/standalone/timer
@rm -f $(addprefix examples/api/, demo demo.bin)
@rm -f tools/bmp_logo tools/easylogo/easylogo \
tools/env/fw_printenv \
tools/envcrc \
$(addprefix tools/gdb/, gdbcont gdbsend) \
tools/gen_eth_addr tools/img2srec \
tools/dumpimage \
$(addprefix tools/, mkenvimage mkimage) \
tools/mpc86x_clk \
$(addprefix tools/, mk$(BOARD)spl mkexynosspl) \
tools/mxsboot \
tools/ncb tools/ubsha1 \
tools/kernel-doc/docproc \
tools/proftool
@rm -f $(addprefix board/cray/L1/, bootscript.c bootscript.image) \
board/matrix_vision/*/bootscript.img \
spl/board/samsung/$(BOARD)/tools/mk$(BOARD)spl \
u-boot.lds \
$(addprefix arch/blackfin/cpu/, init.lds init.elf)
@rm -f include/bmp_logo.h
@rm -f include/bmp_logo_data.h
@rm -f lib/asm-offsets.s
@rm -f include/generated/asm-offsets.h
@rm -f $(CPUDIR)/$(SOC)/asm-offsets.s
@rm -f $(TIMESTAMP_FILE) $(VERSION_FILE)
@$(MAKE) -f $(srctree)/doc/DocBook/Makefile cleandocs
@find $(OBJTREE) -type f \
\( -name 'core' -o -name '*.bak' -o -name '*~' -o -name '*.su' \
-o -name '*.o' -o -name '*.a' -o -name '*.exe' -o -name '*.cmd' \
-o -name '*.cfgtmp' \) -print \
| xargs rm -f
clobber: clean
@find $(OBJTREE) -type f \( -name '*.srec' \
-o -name '*.bin' -o -name u-boot.img \) \
-print0 | xargs -0 rm -f
@rm -f *.bak ctags etags TAGS \
cscope.* *.*~
@rm -f u-boot u-boot.map u-boot.hex $(ALL-y)
@rm -f u-boot.kwb
@rm -f u-boot.pbl
@rm -f u-boot.imx
@rm -f u-boot-with-spl.imx
@rm -f u-boot-with-nand-spl.imx
@rm -f u-boot.ubl
@rm -f u-boot.ais
@rm -f u-boot.dtb
@rm -f u-boot.sb
@rm -f u-boot.spr
@rm -f $(addprefix nand_spl/, u-boot.lds u-boot.lst System.map)
@rm -f $(addprefix nand_spl/, u-boot-nand_spl.lds u-boot-spl u-boot-spl.map)
@rm -f $(addprefix spl/, u-boot-spl u-boot-spl.bin u-boot-spl.map)
@rm -f spl/u-boot-spl.lds
@rm -f $(addprefix tpl/, u-boot-tpl u-boot-tpl.bin u-boot-tpl.map)
@rm -f tpl/u-boot-spl.lds
@rm -f MLO MLO.byteswap
@rm -f SPL
@rm -f tools/xway-swap-bytes
@rm -fr include/asm/proc include/asm/arch include/asm
@rm -fr include/generated
@[ ! -d nand_spl ] || find nand_spl -name "*" -type l -print | xargs rm -f
@rm -f dts/*.tmp
@rm -f $(addprefix spl/, u-boot-spl.ais, u-boot-spl-pad.ais)
mrproper: clobber
@rm -f include/config.h include/config.mk \
board/*/config.tmp board/*/*/config.tmp \
include/autoconf.mk include/autoconf.mk.dep \
include/spl-autoconf.mk \
include/tpl-autoconf.mk
distclean: mrproper
ifneq ($(OBJTREE),$(SRCTREE))
rm -rf *
endif
backup:
F=`basename $(TOPDIR)` ; cd .. ; \
gtar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F
#########################################################################
endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)
endif # skip-makefile
PHONY += FORCE
FORCE:
# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)