Rules.mak - codeaurora/busybox - Gitiles

 # Rules.make for busybox
 #
 # Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
 #
 # Licensed under GPLv2, see the file LICENSE in this tarball for details.
 #

 # Pull in the user's busybox configuration
 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
 -include $(top_builddir)/.config
 endif

 #--------------------------------------------------------
 PROG      := busybox
 MAJOR_VERSION   :=1
 MINOR_VERSION   :=2
 SUBLEVEL_VERSION:=0
 EXTRAVERSION    :=-pre0
 VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")


 #--------------------------------------------------------
 # 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- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
 #--------------------------------------------------------

 # If you are running a cross compiler, you will want to set 'CROSS'
 # to something more interesting...  Target architecture is determined
 # by asking the CC compiler what arch it compiles things for, so unless
 # your compiler is broken, you should not need to specify TARGET_ARCH
 CROSS           =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
 CC             = $(CROSS)gcc
 AR             = $(CROSS)ar
 AS             = $(CROSS)as
 LD             = $(CROSS)ld
 NM             = $(CROSS)nm
 STRIP          = $(CROSS)strip
 ELF2FLT        = $(CROSS)elf2flt
 CPP            = $(CC) -E
 SED           ?= sed


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

 # Select the compiler needed to build binaries for your development system
 HOSTCC    = gcc
 HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer

 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
 LC_ALL:= C

 # 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=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))

 # 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
 #
 # For other libraries, you are on your own.  But these may (or may not) help...
 #LDFLAGS+=-nostdlib
 #LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
 #CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
 #GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")

 # This must bind late because srcdir is reset for every source subdirectory.
 INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
 CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
 CFLAGS+=$(CHECKED_CFLAGS)
 ARFLAGS=cru

 # Warnings

 CFLAGS += -Wall -Wstrict-prototypes -Wshadow
 LDFLAGS += $(call check_ld,--warn-common,)

 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
 # get the CC MAJOR/MINOR version
 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))

 #--------------------------------------------------------
 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
 ifeq ($(strip $(TARGET_ARCH)),)
 TARGET_ARCH:=$(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/' \
 		-e 's/mipsel-.*/mipsel/' \
 		-e 's/cris.*/cris/' \
 		)
 endif

 # A nifty macro to make testing gcc features easier, but note that everything
 # that uses this _must_ use := or it will be re-evaluated for every file.
 ifeq ($(strip $(V)),2)
 VERBOSE_CHECK_GCC=echo check_gcc $(1) >> /dev/stderr;
 endif
 check_gcc=$(shell \
 	$(VERBOSE_CHECK_GCC)\
 	if [ "$(1)" != "" ]; then \
 		if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
 		then echo "$(1)"; else echo "$(2)"; fi \
 	fi)

 # A not very robust macro to check for available ld flags
 check_ld=$(shell \
 	if [ "x$(1)" != "x" ]; then \
 		$(LD) --help | grep -q "\$(1)" && echo "-Wl,$(1)" ; \
 	fi)

 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
 CHECKED_CFLAGS:=$(call check_gcc,-funsigned-char,)
 CHECKED_CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
 CHECKED_CFLAGS+=$(call check_gcc,-fno-builtin-strlen)

 # Preemptively pin this too.
 PROG_CFLAGS:=


 #--------------------------------------------------------
 # 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:=$(call check_gcc,-Os,-O2)

 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
 # gcc 2.95 exits with 0 for "unrecognized option"
 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
 	CFLAGS_COMBINE:=$(call check_gcc,--combine,)
 endif
 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
 OPTIMIZATION+=$(call check_gcc,-fgcse-after-reload,)
 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 # This prevents us from using -fwhole-program when we build the lib
 PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
 endif # CONFIG_BUILD_LIBBUSYBOX
 endif # CONFIG_BUILD_AT_ONCE

 LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
 #LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
 #LIB_LDFLAGS+=$(call check_ld,--as-needed,)
 #LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)


 # Some nice architecture specific optimizations
 ifeq ($(strip $(TARGET_ARCH)),arm)
 	OPTIMIZATION+=-fstrict-aliasing
 endif
 ifeq ($(strip $(TARGET_ARCH)),i386)
 	OPTIMIZATION+=$(call check_gcc,-march=i386,)
 # gcc-4.0 and older seem to benefit from these
 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 	OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
 	OPTIMIZATION+=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
 		-malign-functions=0 -malign-jumps=0 -malign-loops=0)
 #endif # gcc-4.0 and older

 # gcc-4.1 and beyond seem to benefit from these
 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 	# turn off flags which hurt -Os
 	OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
 	OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
 	OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)

 	OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
 endif # gcc-4.1 and beyond
 endif
 OPTIMIZATION+=$(call check_gcc,-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 $(CONFIG_LFS)),y)
     # For large file summit support
     CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 endif
 ifeq ($(strip $(CONFIG_DMALLOC)),y)
     # For testing mem leaks with dmalloc
     CFLAGS+=-DDMALLOC
     LIBRARIES:=-ldmalloc
 else
     ifeq ($(strip $(CONFIG_EFENCE)),y)
 	LIBRARIES:=-lefence
     endif
 endif

 # Debugging info

 ifeq ($(strip $(CONFIG_DEBUG)),y)
     CFLAGS +=-g
 else
     CFLAGS +=-DNDEBUG
     LDFLAGS += $(call check_ld,--sort-common,)
 endif

 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
     CFLAGS += $(OPTIMIZATION)
 endif

 # warn a bit more verbosely for non-release versions
 ifneq ($(EXTRAVERSION),)
     CHECKED_CFLAGS+=$(call check_gcc,-Wstrict-prototypes,)
     CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-prototypes,)
     CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-declarations,)
     CHECKED_CFLAGS+=$(call check_gcc,-Wunused,)
     CHECKED_CFLAGS+=$(call check_gcc,-Winit-self,)
     CHECKED_CFLAGS+=$(call check_gcc,-Wshadow,)
     CHECKED_CFLAGS+=$(call check_gcc,-Wcast-align,)
 endif
 STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
 ifeq ($(strip $(CONFIG_STATIC)),y)
     PROG_CFLAGS += $(call check_gcc,-static,)
 endif
 CFLAGS_SHARED := $(call check_gcc,-shared,)
 LIB_CFLAGS+=$(CFLAGS_SHARED)

 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
     CFLAGS_PIC:= $(call check_gcc,-fPIC,)
     LIB_CFLAGS+=$(CFLAGS_PIC)
 endif


 ifeq ($(strip $(CONFIG_SELINUX)),y)
     LIBRARIES += -lselinux
 endif

 ifeq ($(strip $(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 top_srcdir, both during the compilation phase and the
 # shell script that finds the list of object files.
 # Work in progress by <ldoolitt@recycle.lbl.gov>.


 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 CFLAGS    += $(CHECKED_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)

 #------------------------------------------------------------
 # Installation options
 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
 INSTALL_OPTS=--hardlinks
 endif
 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
 INSTALL_OPTS=--symlinks
 endif
 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
 INSTALL_OPTS=
 endif

 #------------------------------------------------------------
 # Make the output nice and tight
 MAKEFLAGS += --no-print-directory
 export MAKE_IS_SILENT=n
 ifneq ($(findstring s,$(MAKEFLAGS)),)
 export MAKE_IS_SILENT=y
 SECHO := @-false
 DISP  := sil
 Q     := @
 else
 ifneq ($(V)$(VERBOSE),)
 SECHO := @-false
 DISP  := ver
 Q     :=
 else
 SECHO := @echo
 DISP  := pur
 Q     := @
 endif
 endif

 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
 pur_disp_compile.c = echo "  "CC $(show_objs)
 pur_disp_compile.h = echo "  "HOSTCC $(show_objs)
 pur_disp_strip     = echo "  "STRIP $(show_objs)
 pur_disp_link      = echo "  "LINK $(show_objs)
 pur_disp_link.h    = echo "  "HOSTLINK $(show_objs)
 pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs)
 pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
 sil_disp_compile.c = true
 sil_disp_compile.h = true
 sil_disp_strip     = true
 sil_disp_link      = true
 sil_disp_link.h    = true
 sil_disp_ar        = true
 sil_disp_elf2flt   = true
 ver_disp_compile.c = echo $(cmd_compile.c)
 ver_disp_compile.h = echo $(cmd_compile.h)
 ver_disp_strip     = echo $(cmd_strip)
 ver_disp_link      = echo $(cmd_link)
 ver_disp_link.h    = echo $(cmd_link.h)
 ver_disp_ar        = echo $(cmd_ar)
 ver_disp_elf2flt   = echo $(cmd_elf2flt)
 disp_compile.c     = $($(DISP)_disp_compile.c)
 disp_compile.h     = $($(DISP)_disp_compile.h)
 disp_strip         = $($(DISP)_disp_strip)
 disp_link          = $($(DISP)_disp_link)
 disp_link.h        = $($(DISP)_disp_link.h)
 disp_ar            = $($(DISP)_disp_ar)
 disp_gen           = $(SECHO) "  "GEN $@ ; true
 disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
 disp_elf2flt       = $($(DISP)_disp_elf2flt)
 cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
 cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
 cmd_strip          = $(STRIPCMD) $@
 cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS)
 cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
 cmd_ar             = $(AR) $(ARFLAGS) $@ $^
 cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
 compile.c          = @$(disp_compile.c) ; $(cmd_compile.c)
 compile.h          = @$(disp_compile.h) ; $(cmd_compile.h)
 do_strip           = @$(disp_strip)     ; $(cmd_strip)
 do_link            = @$(disp_link)      ; $(cmd_link)
 do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
 do_ar              = @$(disp_ar)        ; $(cmd_ar)
 do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)

 uppercase = $(shell echo $1 | tr '[:lower:]' '[:upper:]')
 %.a:
 	@if test -z "$($(call uppercase,$*)_DIR)" ; then \
 		echo "Invalid target $@" ; \
 		exit 1 ; \
 	fi
 	$(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@

 .PHONY: dummy
	# Rules.make for busybox
	#
	# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
	#
	# Licensed under GPLv2, see the file LICENSE in this tarball for details.
	#

	# Pull in the user's busybox configuration
	ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
	-include $(top_builddir)/.config
	endif

	#--------------------------------------------------------
	PROG := busybox
	MAJOR_VERSION :=1
	MINOR_VERSION :=2
	SUBLEVEL_VERSION:=0
	EXTRAVERSION :=-pre0
	VERSION :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
	BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")


	#--------------------------------------------------------
	# 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- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
	#--------------------------------------------------------

	# If you are running a cross compiler, you will want to set 'CROSS'
	# to something more interesting... Target architecture is determined
	# by asking the CC compiler what arch it compiles things for, so unless
	# your compiler is broken, you should not need to specify TARGET_ARCH
	CROSS =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
	CC = $(CROSS)gcc
	AR = $(CROSS)ar
	AS = $(CROSS)as
	LD = $(CROSS)ld
	NM = $(CROSS)nm
	STRIP = $(CROSS)strip
	ELF2FLT = $(CROSS)elf2flt
	CPP = $(CC) -E
	SED ?= sed


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

	# Select the compiler needed to build binaries for your development system
	HOSTCC = gcc
	HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer

	# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
	LC_ALL:= C

	# 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=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))

	# 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
	#
	# For other libraries, you are on your own. But these may (or may not) help...
	#LDFLAGS+=-nostdlib
	#LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
	#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
	#GCCINCDIR:=$(shell gcc -print-search-dirs \| sed -ne "s/install: \(.*\)/\1include/gp")

	# This must bind late because srcdir is reset for every source subdirectory.
	INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
	CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
	CFLAGS+=$(CHECKED_CFLAGS)
	ARFLAGS=cru

	# Warnings

	CFLAGS += -Wall -Wstrict-prototypes -Wshadow
	LDFLAGS += $(call check_ld,--warn-common,)

	# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
	# get the CC MAJOR/MINOR version
	CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ \| $(CC) -E -xc - \| tail -n 1))
	CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ \| $(CC) -E -xc - \| tail -n 1))

	#--------------------------------------------------------
	export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
	ifeq ($(strip $(TARGET_ARCH)),)
	TARGET_ARCH:=$(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/' \
	-e 's/mipsel-.*/mipsel/' \
	-e 's/cris.*/cris/' \
	)
	endif

	# A nifty macro to make testing gcc features easier, but note that everything
	# that uses this _must_ use := or it will be re-evaluated for every file.
	ifeq ($(strip $(V)),2)
	VERBOSE_CHECK_GCC=echo check_gcc $(1) >> /dev/stderr;
	endif
	check_gcc=$(shell \
	$(VERBOSE_CHECK_GCC)\
	if [ "$(1)" != "" ]; then \
	if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
	then echo "$(1)"; else echo "$(2)"; fi \
	fi)

	# A not very robust macro to check for available ld flags
	check_ld=$(shell \
	if [ "x$(1)" != "x" ]; then \
	$(LD) --help \| grep -q "\$(1)" && echo "-Wl,$(1)" ; \
	fi)

	# Pin CHECKED_CFLAGS with := so it's only evaluated once.
	CHECKED_CFLAGS:=$(call check_gcc,-funsigned-char,)
	CHECKED_CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
	CHECKED_CFLAGS+=$(call check_gcc,-fno-builtin-strlen)

	# Preemptively pin this too.
	PROG_CFLAGS:=


	#--------------------------------------------------------
	# 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:=$(call check_gcc,-Os,-O2)

	ifeq ($(CONFIG_BUILD_AT_ONCE),y)
	# gcc 2.95 exits with 0 for "unrecognized option"
	ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
	CFLAGS_COMBINE:=$(call check_gcc,--combine,)
	endif
	OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
	OPTIMIZATION+=$(call check_gcc,-fgcse-after-reload,)
	ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
	# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
	# This prevents us from using -fwhole-program when we build the lib
	PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
	endif # CONFIG_BUILD_LIBBUSYBOX
	endif # CONFIG_BUILD_AT_ONCE

	LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
	#LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
	#LIB_LDFLAGS+=$(call check_ld,--as-needed,)
	#LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)


	# Some nice architecture specific optimizations
	ifeq ($(strip $(TARGET_ARCH)),arm)
	OPTIMIZATION+=-fstrict-aliasing
	endif
	ifeq ($(strip $(TARGET_ARCH)),i386)
	OPTIMIZATION+=$(call check_gcc,-march=i386,)
	# gcc-4.0 and older seem to benefit from these
	#ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
	OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
	OPTIMIZATION+=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
	-malign-functions=0 -malign-jumps=0 -malign-loops=0)
	#endif # gcc-4.0 and older

	# gcc-4.1 and beyond seem to benefit from these
	ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
	# turn off flags which hurt -Os
	OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
	OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
	OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)

	OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
	endif # gcc-4.1 and beyond
	endif
	OPTIMIZATION+=$(call check_gcc,-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 $(CONFIG_LFS)),y)
	# For large file summit support
	CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
	endif
	ifeq ($(strip $(CONFIG_DMALLOC)),y)
	# For testing mem leaks with dmalloc
	CFLAGS+=-DDMALLOC
	LIBRARIES:=-ldmalloc
	else
	ifeq ($(strip $(CONFIG_EFENCE)),y)
	LIBRARIES:=-lefence
	endif
	endif

	# Debugging info

	ifeq ($(strip $(CONFIG_DEBUG)),y)
	CFLAGS +=-g
	else
	CFLAGS +=-DNDEBUG
	LDFLAGS += $(call check_ld,--sort-common,)
	endif

	ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
	CFLAGS += $(OPTIMIZATION)
	endif

	# warn a bit more verbosely for non-release versions
	ifneq ($(EXTRAVERSION),)
	CHECKED_CFLAGS+=$(call check_gcc,-Wstrict-prototypes,)
	CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-prototypes,)
	CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-declarations,)
	CHECKED_CFLAGS+=$(call check_gcc,-Wunused,)
	CHECKED_CFLAGS+=$(call check_gcc,-Winit-self,)
	CHECKED_CFLAGS+=$(call check_gcc,-Wshadow,)
	CHECKED_CFLAGS+=$(call check_gcc,-Wcast-align,)
	endif
	STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
	ifeq ($(strip $(CONFIG_STATIC)),y)
	PROG_CFLAGS += $(call check_gcc,-static,)
	endif
	CFLAGS_SHARED := $(call check_gcc,-shared,)
	LIB_CFLAGS+=$(CFLAGS_SHARED)

	ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
	CFLAGS_PIC:= $(call check_gcc,-fPIC,)
	LIB_CFLAGS+=$(CFLAGS_PIC)
	endif


	ifeq ($(strip $(CONFIG_SELINUX)),y)
	LIBRARIES += -lselinux
	endif

	ifeq ($(strip $(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 top_srcdir, both during the compilation phase and the
	# shell script that finds the list of object files.
	# Work in progress by <ldoolitt@recycle.lbl.gov>.


	OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
	CFLAGS += $(CHECKED_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)

	#------------------------------------------------------------
	# Installation options
	ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
	INSTALL_OPTS=--hardlinks
	endif
	ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
	INSTALL_OPTS=--symlinks
	endif
	ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
	INSTALL_OPTS=
	endif

	#------------------------------------------------------------
	# Make the output nice and tight
	MAKEFLAGS += --no-print-directory
	export MAKE_IS_SILENT=n
	ifneq ($(findstring s,$(MAKEFLAGS)),)
	export MAKE_IS_SILENT=y
	SECHO := @-false
	DISP := sil
	Q := @
	else
	ifneq ($(V)$(VERBOSE),)
	SECHO := @-false
	DISP := ver
	Q :=
	else
	SECHO := @echo
	DISP := pur
	Q := @
	endif
	endif

	show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
	pur_disp_compile.c = echo " "CC $(show_objs)
	pur_disp_compile.h = echo " "HOSTCC $(show_objs)
	pur_disp_strip = echo " "STRIP $(show_objs)
	pur_disp_link = echo " "LINK $(show_objs)
	pur_disp_link.h = echo " "HOSTLINK $(show_objs)
	pur_disp_ar = echo " "AR $(ARFLAGS) $(show_objs)
	pur_disp_elf2flt = echo " "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
	sil_disp_compile.c = true
	sil_disp_compile.h = true
	sil_disp_strip = true
	sil_disp_link = true
	sil_disp_link.h = true
	sil_disp_ar = true
	sil_disp_elf2flt = true
	ver_disp_compile.c = echo $(cmd_compile.c)
	ver_disp_compile.h = echo $(cmd_compile.h)
	ver_disp_strip = echo $(cmd_strip)
	ver_disp_link = echo $(cmd_link)
	ver_disp_link.h = echo $(cmd_link.h)
	ver_disp_ar = echo $(cmd_ar)
	ver_disp_elf2flt = echo $(cmd_elf2flt)
	disp_compile.c = $($(DISP)_disp_compile.c)
	disp_compile.h = $($(DISP)_disp_compile.h)
	disp_strip = $($(DISP)_disp_strip)
	disp_link = $($(DISP)_disp_link)
	disp_link.h = $($(DISP)_disp_link.h)
	disp_ar = $($(DISP)_disp_ar)
	disp_gen = $(SECHO) " "GEN $@ ; true
	disp_doc = $(SECHO) " "DOC $(subst docs/,,$@) ; true
	disp_elf2flt = $($(DISP)_disp_elf2flt)
	cmd_compile.c = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
	cmd_compile.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
	cmd_strip = $(STRIPCMD) $@
	cmd_link = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS)
	cmd_link.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
	cmd_ar = $(AR) $(ARFLAGS) $@ $^
	cmd_elf2flt = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
	compile.c = @$(disp_compile.c) ; $(cmd_compile.c)
	compile.h = @$(disp_compile.h) ; $(cmd_compile.h)
	do_strip = @$(disp_strip) ; $(cmd_strip)
	do_link = @$(disp_link) ; $(cmd_link)
	do_link.h = @$(disp_link.h) ; $(cmd_link.h)
	do_ar = @$(disp_ar) ; $(cmd_ar)
	do_elf2flt = @$(disp_elf2flt) ; $(cmd_elf2flt)

	uppercase = $(shell echo $1 \| tr '[:lower:]' '[:upper:]')
	%.a:
	@if test -z "$($(call uppercase,$*)_DIR)" ; then \
	echo "Invalid target $@" ; \
	exit 1 ; \
	fi
	$(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@

	.PHONY: dummy