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272 lines
8.9 KiB
Makefile
272 lines
8.9 KiB
Makefile
# Rules.make for busybox
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#
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# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
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#
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# Licensed under GPLv2, see the file LICENSE in this tarball for details.
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#
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# Pull in the user's busybox configuration
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ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
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-include $(top_builddir)/.config
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endif
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#--------------------------------------------------------
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PROG := busybox
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MAJOR_VERSION :=1
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MINOR_VERSION :=1
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SUBLEVEL_VERSION:=1
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EXTRAVERSION :=-pre0
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VERSION :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
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BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
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#--------------------------------------------------------
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# With a modern GNU make(1) (highly recommended, that's what all the
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# developers use), all of the following configuration values can be
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# overridden at the command line. For example:
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# make CROSS=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
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#--------------------------------------------------------
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# If you are running a cross compiler, you will want to set 'CROSS'
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# to something more interesting... Target architecture is determined
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# by asking the CC compiler what arch it compiles things for, so unless
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# your compiler is broken, you should not need to specify TARGET_ARCH
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CROSS =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
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CC = $(CROSS)gcc
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AR = $(CROSS)ar
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AS = $(CROSS)as
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LD = $(CROSS)ld
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NM = $(CROSS)nm
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STRIP = $(CROSS)strip
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CPP = $(CC) -E
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# MAKEFILES = $(top_builddir)/.config
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RM = rm
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RM_F = $(RM) -f
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LN = ln
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LN_S = $(LN) -s
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MKDIR = mkdir
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MKDIR_P = $(MKDIR) -p
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MV = mv
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CP = cp
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# What OS are you compiling busybox for? This allows you to include
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# OS specific things, syscall overrides, etc.
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TARGET_OS=linux
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# Select the compiler needed to build binaries for your development system
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HOSTCC = gcc
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HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
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# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
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LC_ALL:= C
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# If you want to add some simple compiler switches (like -march=i686),
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# especially from the command line, use this instead of CFLAGS directly.
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# For optimization overrides, it's better still to set OPTIMIZATION.
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CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
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# To compile vs some other alternative libc, you may need to use/adjust
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# the following lines to meet your needs...
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#
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# If you are using Red Hat 6.x with the compatible RPMs (for developing under
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# Red Hat 5.x and glibc 2.0) uncomment the following. Be sure to read about
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# using the compatible RPMs (compat-*) at http://www.redhat.com !
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#LIBCDIR:=/usr/i386-glibc20-linux
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#
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# For other libraries, you are on your own. But these may (or may not) help...
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#LDFLAGS+=-nostdlib
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#LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
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#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
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#GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
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WARNINGS=-Wall -Wstrict-prototypes -Wshadow
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CFLAGS+=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
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ARFLAGS=cru
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# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
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# get the CC MAJOR/MINOR version
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CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
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CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
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#--------------------------------------------------------
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export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
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ifeq ($(strip $(TARGET_ARCH)),)
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TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
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-e 's/i.86/i386/' \
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-e 's/sparc.*/sparc/' \
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-e 's/arm.*/arm/g' \
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-e 's/m68k.*/m68k/' \
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-e 's/ppc/powerpc/g' \
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-e 's/v850.*/v850/g' \
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-e 's/sh[234]/sh/' \
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-e 's/mips-.*/mips/' \
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-e 's/mipsel-.*/mipsel/' \
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-e 's/cris.*/cris/' \
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)
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endif
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# A nifty macro to make testing gcc features easier
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check_gcc=$(shell \
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if [ "$(1)" != "" ]; then \
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if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
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then echo "$(1)"; else echo "$(2)"; fi \
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fi)
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# A not very robust macro to check for available ld flags
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check_ld=$(shell \
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if [ "x$(1)" != "x" ]; then \
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$(LD) --help | grep -q \\$(1) && echo "-Wl,$(1)$(2)" ; \
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fi)
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# A not very robust macro to check for available as flags
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check_as=$(shell \
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if [ "x$(1)" != "x" ]; then \
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$(AS) --help | grep -q "\\$(1)" && echo "-Wa,$(1)$(2)" ; \
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fi)
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# Setup some shortcuts so that silent mode is silent like it should be
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ifeq ($(subst s,,$(MAKEFLAGS)),$(MAKEFLAGS))
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export MAKE_IS_SILENT=n
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SECHO=@echo
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else
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export MAKE_IS_SILENT=y
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SECHO=-@false
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endif
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CFLAGS+=$(call check_gcc,-funsigned-char,)
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CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
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#--------------------------------------------------------
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# Arch specific compiler optimization stuff should go here.
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# Unless you want to override the defaults, do not set anything
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# for OPTIMIZATION...
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# use '-Os' optimization if available, else use -O2
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OPTIMIZATION:=$(call check_gcc,-Os,-O2)
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ifeq ($(CONFIG_BUILD_AT_ONCE),y)
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# gcc 2.95 exits with 0 for "unrecognized option"
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ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
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OPTIMIZATION+=$(call check_gcc,--combine,)
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endif
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OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
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PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
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endif # CONFIG_BUILD_AT_ONCE
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LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
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#LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
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#LIB_LDFLAGS+=$(call check_ld,--as-needed,)
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#LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)
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# Some nice architecture specific optimizations
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ifeq ($(strip $(TARGET_ARCH)),arm)
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OPTIMIZATION+=-fstrict-aliasing
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endif
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ifeq ($(strip $(TARGET_ARCH)),i386)
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OPTIMIZATION+=$(call check_gcc,-march=i386,)
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# gcc-4.0 and older seem to suffer from these
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ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
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OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
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OPTIMIZATION+=$(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,\
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-malign-functions=0 -malign-jumps=0 -malign-loops=0)
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endif # gcc-4.0 and older
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# gcc-4.1 and beyond seem to benefit from these
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ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
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# turn off flags which hurt -Os
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OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
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OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
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OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
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OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
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endif # gcc-4.1 and beyond
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endif
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OPTIMIZATIONS:=$(OPTIMIZATION) $(call check_gcc,-fomit-frame-pointer,)
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#
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#--------------------------------------------------------
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# If you're going to do a lot of builds with a non-vanilla configuration,
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# it makes sense to adjust parameters above, so you can type "make"
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# by itself, instead of following it by the same half-dozen overrides
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# every time. The stuff below, on the other hand, is probably less
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# prone to casual user adjustment.
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#
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ifeq ($(strip $(CONFIG_LFS)),y)
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# For large file summit support
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CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
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endif
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ifeq ($(strip $(CONFIG_DMALLOC)),y)
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# For testing mem leaks with dmalloc
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CFLAGS+=-DDMALLOC
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LIBRARIES:=-ldmalloc
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else
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ifeq ($(strip $(CONFIG_EFENCE)),y)
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LIBRARIES:=-lefence
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endif
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endif
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ifeq ($(strip $(CONFIG_DEBUG)),y)
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CFLAGS +=$(WARNINGS) -g -D_GNU_SOURCE
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LDFLAGS += $(call check_ld,-warn-common,)
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STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
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else
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CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
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LDFLAGS += $(call check_ld,-warn-common,)
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LDFLAGS += $(call check_ld,--sort-common,)
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STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
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endif
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ifeq ($(strip $(CONFIG_STATIC)),y)
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LDFLAGS += $(call check_ld,--static,)
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#else
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# LIBRARIES += -ldl
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endif
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ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
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CFLAGS_PIC:= $(call check_gcc,-fPIC,)
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endif
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ifeq ($(strip $(CONFIG_SELINUX)),y)
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LIBRARIES += -lselinux
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endif
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ifeq ($(strip $(PREFIX)),)
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PREFIX:=`pwd`/_install
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endif
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# Additional complications due to support for pristine source dir.
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# Include files in the build directory should take precedence over
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# the copy in top_srcdir, both during the compilation phase and the
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# shell script that finds the list of object files.
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# Work in progress by <ldoolitt@recycle.lbl.gov>.
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OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
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CFLAGS += $(CROSS_CFLAGS)
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ifdef BB_INIT_SCRIPT
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CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
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endif
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# Put user-supplied flags at the end, where they
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# have a chance of winning.
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CFLAGS += $(CFLAGS_EXTRA)
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#------------------------------------------------------------
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# Installation options
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ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
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INSTALL_OPTS=--hardlinks
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endif
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ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
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INSTALL_OPTS=--symlinks
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endif
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ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
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INSTALL_OPTS=
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endif
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.PHONY: dummy
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