Rules.mak - busybox - Git at Google

 # Rules.make for busybox
 #
 # Copyright (C) 2002 Erik Andersen <andersee@debian.org>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 2 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 # General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 #

 PROG      := busybox
 VERSION   := 0.61.pre
 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
 HOSTCC    := gcc
 HOSTCFLAGS:= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer


 # What OS are you compiling busybox for?  This allows you to include
 # OS specific things, syscall overrides, etc.
 TARGET_OS:=linux

 # With a modern GNU make(1) (highly recommended, that's what all the
 # developers use), all of the following configuration values can be
 # overridden at the command line.  For example:
 #   make CROSS=powerpc-linux- BB_SRC_DIR=$HOME/busybox PREFIX=/mnt/app

 # If you want to add some simple compiler switches (like -march=i686),
 # especially from the command line, use this instead of CFLAGS directly.
 # For optimization overrides, it's better still to set OPTIMIZATION.
 CFLAGS_EXTRA:=#-Werror

 # If you want a static binary, turn this on.
 DOSTATIC:=false

 # Set the following to `true' to make a debuggable build.
 # Leave this set to `false' for production use.
 DODEBUG:=false

 # This enables compiling with dmalloc ( http://dmalloc.com/ )
 # which is an excellent public domain mem leak and malloc problem
 # detector.  To enable dmalloc, before running busybox you will
 # want to first set up your environment.
 # eg: `export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile`
 # The debug= value is generated using the following command
 # dmalloc -p log-stats -p log-non-free -p log-bad-space -p log-elapsed-time \
 #      -p check-fence -p check-heap -p check-lists -p check-blank \
 #      -p check-funcs -p realloc-copy -p allow-free-null
 # Do not enable this for production builds...
 DODMALLOC:=false

 # Electric-fence is another very useful malloc debugging library.
 # Do not enable this for production builds...
 DOEFENCE:=false

 # If you want large file summit support, turn this on.
 # This has no effect if you don't have a kernel with lfs
 # support, and a system with libc-2.1.3 or later.
 # Some of the programs that can benefit from lfs support
 # are dd, gzip, mount, tar, and mkfs_minix.
 # LFS allows you to use the above programs for files
 # larger than 2GB!
 DOLFS:=false

 # If you have a "pristine" source directory, point BB_SRC_DIR to it.
 # Experimental and incomplete; tell the mailing list
 # <busybox@busybox.net> if you do or don't like it so far.
 BB_SRC_DIR:=

 # If you are running a cross compiler, you may want to set CROSS
 # to something more interesting, like "arm-linux-".
 CROSS:=
 CC             := $(CROSS)gcc
 AR             := $(CROSS)ar
 AS             := $(CROSS)as
 LD             := $(CROSS)ld
 NM             := $(CROSS)nm
 STRIP          := $(CROSS)strip
 CPP            := $(CC) -E
 MAKEFILES      := $(TOPDIR).config
 export VERSION BUILDTIME TOPDIR HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP


 # To compile vs uClibc, just use the compiler wrapper built by uClibc...
 # Everything should compile and work as expected these days...
 #CC:=/usr/i386-linux-uclibc/bin/i386-uclibc-gcc

 # To compile vs some other alternative libc, you may need to use/adjust
 # the following lines to meet your needs...
 #
 # If you are using Red Hat 6.x with the compatible RPMs (for developing under
 # Red Hat 5.x and glibc 2.0) uncomment the following.  Be sure to read about
 # using the compatible RPMs (compat-*) at http://www.redhat.com !
 #LIBCDIR:=/usr/i386-glibc20-linux
 #
 # The following is used for libc5 (if you install altgcc and libc5-altdev
 # on a Debian system).
 #LIBCDIR:=/usr/i486-linuxlibc1
 #
 # For other libraries, you are on your own...
 #LDFLAGS+=-nostdlib
 #LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
 #CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR)
 #GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")

 WARNINGS:=-Wall -Wstrict-prototypes -Wshadow
 CFLAGS:=-I$(TOPDIR)include
 ARFLAGS:=-r

 TARGET_ARCH:=${shell $(CC) -dumpmachine | sed -e s'/-.*//' \
 		-e 's/i.86/i386/' \
 		-e 's/sparc.*/sparc/' \
 		-e 's/arm.*/arm/g' \
 		-e 's/m68k.*/m68k/' \
 		-e 's/ppc/powerpc/g' \
 		-e 's/v850.*/v850/g' \
 		-e 's/sh[234]/sh/' \
 		-e 's/mips.*/mips/' \
 		}

 #--------------------------------------------------------
 # Arch specific compiler optimization stuff should go here.
 # Unless you want to override the defaults, do not set anything
 # for OPTIMIZATION...

 # use '-Os' optimization if available, else use -O2
 OPTIMIZATION := ${shell if $(CC) -Os -S -o /dev/null -xc /dev/null \
 	>/dev/null 2>&1; then echo "-Os"; else echo "-O2" ; fi}

 # Some nice architecture specific optimizations
 ifeq ($(strip $(TARGET_ARCH)),arm)
 	OPTIMIZATION+=-fstrict-aliasing
 endif
 ifeq ($(strip $(TARGET_ARCH)),i386)
 	OPTIMIZATION+=-march=i386
 	OPTIMIZATION+=${shell if $(CC) -mpreferred-stack-boundary=2 -S -o /dev/null -xc \
 		/dev/null >/dev/null 2>&1; then echo "-mpreferred-stack-boundary=2"; fi}
 	OPTIMIZATION+=${shell if $(CC) -falign-functions=1 -falign-jumps=0 -falign-loops=0 \
 		-S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo \
 		"-falign-functions=1 -falign-jumps=0 -falign-loops=0"; else \
 		if $(CC) -malign-functions=0 -malign-jumps=0 -S -o /dev/null -xc \
 		/dev/null >/dev/null 2>&1; then echo "-malign-functions=0 -malign-jumps=0"; fi; fi}
 endif
 OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer

 #
 #--------------------------------------------------------
 # If you're going to do a lot of builds with a non-vanilla configuration,
 # it makes sense to adjust parameters above, so you can type "make"
 # by itself, instead of following it by the same half-dozen overrides
 # every time.  The stuff below, on the other hand, is probably less
 # prone to casual user adjustment.
 #

 ifeq ($(strip $(DOLFS)),true)
     # For large file summit support
     CFLAGS+=-D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64
 endif
 ifeq ($(strip $(DODMALLOC)),true)
     # For testing mem leaks with dmalloc
     CFLAGS+=-DDMALLOC
     LIBRARIES:=-ldmalloc
     # Force debug=true, since this is useless when not debugging...
     DODEBUG:=true
 else
     ifeq ($(strip $(DOEFENCE)),true)
 	LIBRARIES:=-lefence
 	# Force debug=true, since this is useless when not debugging...
 	DODEBUG:=true
     endif
 endif
 ifeq ($(strip $(DODEBUG)),true)
     CFLAGS  +=$(WARNINGS) -g -D_GNU_SOURCE
     LDFLAGS +=-Wl,-warn-common
     STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
 else
     CFLAGS  += $(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE
     LDFLAGS += -s -Wl,-warn-common
     STRIPCMD:=$(STRIP) --remove-section=.note --remove-section=.comment
 endif
 ifeq ($(strip $(DOSTATIC)),true)
     LDFLAGS += --static
 endif

 ifndef $(PREFIX)
     PREFIX:=`pwd`/_install
 endif

 # Additional complications due to support for pristine source dir.
 # Include files in the build directory should take precedence over
 # the copy in BB_SRC_DIR, both during the compilation phase and the
 # shell script that finds the list of object files.
 # Work in progress by <ldoolitt@recycle.lbl.gov>.
 #
 ifneq ($(strip $(BB_SRC_DIR)),)
     VPATH:=$(BB_SRC_DIR)
 endif

 CFLAGS    += -DBB_VER='"$(VERSION)"'
 CFLAGS    += -DBB_BT='"$(BUILDTIME)"'
 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 CFLAGS    += $(CROSS_CFLAGS)
 ifdef BB_INIT_SCRIPT
     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 endif

 # Put user-supplied flags at the end, where they
 # have a chance of winning.
 CFLAGS += $(CFLAGS_EXTRA)

 %.o: %.c
 	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<

 ifdef _FASTDEP_ALL_SUB_DIRS
 fastdep: dummy
 	$(TOPDIR)scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -- $(wildcard *.[chS]) > .depend
 ifdef ALL_SUB_DIRS
 	$(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 endif

 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 	$(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 endif

 .PHONY: dummy


 .EXPORT_ALL_VARIABLES:
	# Rules.make for busybox
	#
	# Copyright (C) 2002 Erik Andersen <andersee@debian.org>
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation; either version 2 of the License, or
	# (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	# General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program; if not, write to the Free Software
	# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	#

	PROG := busybox
	VERSION := 0.61.pre
	BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
	HOSTCC := gcc
	HOSTCFLAGS:= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer


	# What OS are you compiling busybox for? This allows you to include
	# OS specific things, syscall overrides, etc.
	TARGET_OS:=linux

	# With a modern GNU make(1) (highly recommended, that's what all the
	# developers use), all of the following configuration values can be
	# overridden at the command line. For example:
	# make CROSS=powerpc-linux- BB_SRC_DIR=$HOME/busybox PREFIX=/mnt/app

	# If you want to add some simple compiler switches (like -march=i686),
	# especially from the command line, use this instead of CFLAGS directly.
	# For optimization overrides, it's better still to set OPTIMIZATION.
	CFLAGS_EXTRA:=#-Werror

	# If you want a static binary, turn this on.
	DOSTATIC:=false

	# Set the following to `true' to make a debuggable build.
	# Leave this set to `false' for production use.
	DODEBUG:=false

	# This enables compiling with dmalloc ( http://dmalloc.com/ )
	# which is an excellent public domain mem leak and malloc problem
	# detector. To enable dmalloc, before running busybox you will
	# want to first set up your environment.
	# eg: `export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile`
	# The debug= value is generated using the following command
	# dmalloc -p log-stats -p log-non-free -p log-bad-space -p log-elapsed-time \
	# -p check-fence -p check-heap -p check-lists -p check-blank \
	# -p check-funcs -p realloc-copy -p allow-free-null
	# Do not enable this for production builds...
	DODMALLOC:=false

	# Electric-fence is another very useful malloc debugging library.
	# Do not enable this for production builds...
	DOEFENCE:=false

	# If you want large file summit support, turn this on.
	# This has no effect if you don't have a kernel with lfs
	# support, and a system with libc-2.1.3 or later.
	# Some of the programs that can benefit from lfs support
	# are dd, gzip, mount, tar, and mkfs_minix.
	# LFS allows you to use the above programs for files
	# larger than 2GB!
	DOLFS:=false

	# If you have a "pristine" source directory, point BB_SRC_DIR to it.
	# Experimental and incomplete; tell the mailing list
	# <busybox@busybox.net> if you do or don't like it so far.
	BB_SRC_DIR:=

	# If you are running a cross compiler, you may want to set CROSS
	# to something more interesting, like "arm-linux-".
	CROSS:=
	CC := $(CROSS)gcc
	AR := $(CROSS)ar
	AS := $(CROSS)as
	LD := $(CROSS)ld
	NM := $(CROSS)nm
	STRIP := $(CROSS)strip
	CPP := $(CC) -E
	MAKEFILES := $(TOPDIR).config
	export VERSION BUILDTIME TOPDIR HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP


	# To compile vs uClibc, just use the compiler wrapper built by uClibc...
	# Everything should compile and work as expected these days...
	#CC:=/usr/i386-linux-uclibc/bin/i386-uclibc-gcc

	# To compile vs some other alternative libc, you may need to use/adjust
	# the following lines to meet your needs...
	#
	# If you are using Red Hat 6.x with the compatible RPMs (for developing under
	# Red Hat 5.x and glibc 2.0) uncomment the following. Be sure to read about
	# using the compatible RPMs (compat-*) at http://www.redhat.com !
	#LIBCDIR:=/usr/i386-glibc20-linux
	#
	# The following is used for libc5 (if you install altgcc and libc5-altdev
	# on a Debian system).
	#LIBCDIR:=/usr/i486-linuxlibc1
	#
	# For other libraries, you are on your own...
	#LDFLAGS+=-nostdlib
	#LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
	#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR)
	#GCCINCDIR:=$(shell gcc -print-search-dirs \| sed -ne "s/install: \(.*\)/\1include/gp")

	WARNINGS:=-Wall -Wstrict-prototypes -Wshadow
	CFLAGS:=-I$(TOPDIR)include
	ARFLAGS:=-r

	TARGET_ARCH:=${shell $(CC) -dumpmachine \| sed -e s'/-.*//' \
	-e 's/i.86/i386/' \
	-e 's/sparc.*/sparc/' \
	-e 's/arm.*/arm/g' \
	-e 's/m68k.*/m68k/' \
	-e 's/ppc/powerpc/g' \
	-e 's/v850.*/v850/g' \
	-e 's/sh[234]/sh/' \
	-e 's/mips.*/mips/' \
	}

	#--------------------------------------------------------
	# Arch specific compiler optimization stuff should go here.
	# Unless you want to override the defaults, do not set anything
	# for OPTIMIZATION...

	# use '-Os' optimization if available, else use -O2
	OPTIMIZATION := ${shell if $(CC) -Os -S -o /dev/null -xc /dev/null \
	>/dev/null 2>&1; then echo "-Os"; else echo "-O2" ; fi}

	# Some nice architecture specific optimizations
	ifeq ($(strip $(TARGET_ARCH)),arm)
	OPTIMIZATION+=-fstrict-aliasing
	endif
	ifeq ($(strip $(TARGET_ARCH)),i386)
	OPTIMIZATION+=-march=i386
	OPTIMIZATION+=${shell if $(CC) -mpreferred-stack-boundary=2 -S -o /dev/null -xc \
	/dev/null >/dev/null 2>&1; then echo "-mpreferred-stack-boundary=2"; fi}
	OPTIMIZATION+=${shell if $(CC) -falign-functions=1 -falign-jumps=0 -falign-loops=0 \
	-S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo \
	"-falign-functions=1 -falign-jumps=0 -falign-loops=0"; else \
	if $(CC) -malign-functions=0 -malign-jumps=0 -S -o /dev/null -xc \
	/dev/null >/dev/null 2>&1; then echo "-malign-functions=0 -malign-jumps=0"; fi; fi}
	endif
	OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer

	#
	#--------------------------------------------------------
	# If you're going to do a lot of builds with a non-vanilla configuration,
	# it makes sense to adjust parameters above, so you can type "make"
	# by itself, instead of following it by the same half-dozen overrides
	# every time. The stuff below, on the other hand, is probably less
	# prone to casual user adjustment.
	#

	ifeq ($(strip $(DOLFS)),true)
	# For large file summit support
	CFLAGS+=-D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64
	endif
	ifeq ($(strip $(DODMALLOC)),true)
	# For testing mem leaks with dmalloc
	CFLAGS+=-DDMALLOC
	LIBRARIES:=-ldmalloc
	# Force debug=true, since this is useless when not debugging...
	DODEBUG:=true
	else
	ifeq ($(strip $(DOEFENCE)),true)
	LIBRARIES:=-lefence
	# Force debug=true, since this is useless when not debugging...
	DODEBUG:=true
	endif
	endif
	ifeq ($(strip $(DODEBUG)),true)
	CFLAGS +=$(WARNINGS) -g -D_GNU_SOURCE
	LDFLAGS +=-Wl,-warn-common
	STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
	else
	CFLAGS += $(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE
	LDFLAGS += -s -Wl,-warn-common
	STRIPCMD:=$(STRIP) --remove-section=.note --remove-section=.comment
	endif
	ifeq ($(strip $(DOSTATIC)),true)
	LDFLAGS += --static
	endif

	ifndef $(PREFIX)
	PREFIX:=`pwd`/_install
	endif

	# Additional complications due to support for pristine source dir.
	# Include files in the build directory should take precedence over
	# the copy in BB_SRC_DIR, both during the compilation phase and the
	# shell script that finds the list of object files.
	# Work in progress by <ldoolitt@recycle.lbl.gov>.
	#
	ifneq ($(strip $(BB_SRC_DIR)),)
	VPATH:=$(BB_SRC_DIR)
	endif

	CFLAGS += -DBB_VER='"$(VERSION)"'
	CFLAGS += -DBB_BT='"$(BUILDTIME)"'
	OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
	CFLAGS += $(CROSS_CFLAGS)
	ifdef BB_INIT_SCRIPT
	CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
	endif

	# Put user-supplied flags at the end, where they
	# have a chance of winning.
	CFLAGS += $(CFLAGS_EXTRA)

	%.o: %.c
	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<

	ifdef _FASTDEP_ALL_SUB_DIRS
	fastdep: dummy
	$(TOPDIR)scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -- $(wildcard *.[chS]) > .depend
	ifdef ALL_SUB_DIRS
	$(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
	endif

	$(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
	$(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
	endif

	.PHONY: dummy



	.EXPORT_ALL_VARIABLES: