1# Rules.make for busybox
2#
3# Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
4#
5# Licensed under GPLv2, see the file LICENSE in this tarball for details.
6#
7
8# Pull in the user's busybox configuration
9ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
10-include $(top_builddir)/.config
11endif
12
13#--------------------------------------------------------
14PROG      := busybox
15MAJOR_VERSION   :=1
16MINOR_VERSION   :=1
17SUBLEVEL_VERSION:=0
18EXTRAVERSION    :=
19VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
20BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
21
22
23#--------------------------------------------------------
24# With a modern GNU make(1) (highly recommended, that's what all the
25# developers use), all of the following configuration values can be
26# overridden at the command line.  For example:
27#   make CROSS=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
28#--------------------------------------------------------
29
30# If you are running a cross compiler, you will want to set 'CROSS'
31# to something more interesting...  Target architecture is determined
32# by asking the CC compiler what arch it compiles things for, so unless
33# your compiler is broken, you should not need to specify TARGET_ARCH
34CROSS           =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
35CC             = $(CROSS)gcc
36AR             = $(CROSS)ar
37AS             = $(CROSS)as
38LD             = $(CROSS)ld
39NM             = $(CROSS)nm
40STRIP          = $(CROSS)strip
41CPP            = $(CC) -E
42# MAKEFILES      = $(top_builddir)/.config
43RM             = rm
44RM_F           = $(RM) -f
45LN             = ln
46LN_S           = $(LN) -s
47MKDIR          = mkdir
48MKDIR_P        = $(MKDIR) -p
49MV             = mv
50CP             = cp
51
52
53# What OS are you compiling busybox for?  This allows you to include
54# OS specific things, syscall overrides, etc.
55TARGET_OS=linux
56
57# Select the compiler needed to build binaries for your development system
58HOSTCC    = gcc
59HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
60
61# Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
62LC_ALL:= C
63
64# If you want to add some simple compiler switches (like -march=i686),
65# especially from the command line, use this instead of CFLAGS directly.
66# For optimization overrides, it's better still to set OPTIMIZATION.
67CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
68
69# To compile vs some other alternative libc, you may need to use/adjust
70# the following lines to meet your needs...
71#
72# If you are using Red Hat 6.x with the compatible RPMs (for developing under
73# Red Hat 5.x and glibc 2.0) uncomment the following.  Be sure to read about
74# using the compatible RPMs (compat-*) at http://www.redhat.com !
75#LIBCDIR:=/usr/i386-glibc20-linux
76#
77# For other libraries, you are on your own.  But these may (or may not) help...
78#LDFLAGS+=-nostdlib
79#LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
80#CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
81#GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
82
83WARNINGS=-Wall -Wstrict-prototypes -Wshadow
84CFLAGS=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
85ARFLAGS=cru
86
87
88# gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
89# get the CC MAJOR/MINOR version
90CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
91CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
92
93#--------------------------------------------------------
94export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
95ifeq ($(strip $(TARGET_ARCH)),)
96TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
97		-e 's/i.86/i386/' \
98		-e 's/sparc.*/sparc/' \
99		-e 's/arm.*/arm/g' \
100		-e 's/m68k.*/m68k/' \
101		-e 's/ppc/powerpc/g' \
102		-e 's/v850.*/v850/g' \
103		-e 's/sh[234]/sh/' \
104		-e 's/mips-.*/mips/' \
105		-e 's/mipsel-.*/mipsel/' \
106		-e 's/cris.*/cris/' \
107		)
108endif
109
110# A nifty macro to make testing gcc features easier
111check_gcc=$(shell \
112	if [ "$(1)" != "" ]; then \
113		if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
114		then echo "$(1)"; else echo "$(2)"; fi \
115	fi)
116
117# Setup some shortcuts so that silent mode is silent like it should be
118ifeq ($(subst s,,$(MAKEFLAGS)),$(MAKEFLAGS))
119export MAKE_IS_SILENT=n
120SECHO=@echo
121else
122export MAKE_IS_SILENT=y
123SECHO=-@false
124endif
125
126CFLAGS+=$(call check_gcc,-funsigned-char,)
127
128#--------------------------------------------------------
129# Arch specific compiler optimization stuff should go here.
130# Unless you want to override the defaults, do not set anything
131# for OPTIMIZATION...
132
133# use '-Os' optimization if available, else use -O2
134OPTIMIZATION:=$(call check_gcc,-Os,-O2)
135
136# Some nice architecture specific optimizations
137ifeq ($(strip $(TARGET_ARCH)),arm)
138	OPTIMIZATION+=-fstrict-aliasing
139endif
140ifeq ($(strip $(TARGET_ARCH)),i386)
141	OPTIMIZATION+=$(call check_gcc,-march=i386,)
142	OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
143	OPTIMIZATION+=$(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,\
144		-malign-functions=0 -malign-jumps=0 -malign-loops=0)
145endif
146OPTIMIZATIONS:=$(OPTIMIZATION) -fomit-frame-pointer
147
148#
149#--------------------------------------------------------
150# If you're going to do a lot of builds with a non-vanilla configuration,
151# it makes sense to adjust parameters above, so you can type "make"
152# by itself, instead of following it by the same half-dozen overrides
153# every time.  The stuff below, on the other hand, is probably less
154# prone to casual user adjustment.
155#
156
157ifeq ($(strip $(CONFIG_LFS)),y)
158    # For large file summit support
159    CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
160endif
161ifeq ($(strip $(CONFIG_DMALLOC)),y)
162    # For testing mem leaks with dmalloc
163    CFLAGS+=-DDMALLOC
164    LIBRARIES:=-ldmalloc
165else
166    ifeq ($(strip $(CONFIG_EFENCE)),y)
167	LIBRARIES:=-lefence
168    endif
169endif
170ifeq ($(strip $(CONFIG_DEBUG)),y)
171    CFLAGS  +=$(WARNINGS) -g -D_GNU_SOURCE
172    LDFLAGS +=-Wl,-warn-common
173    STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
174else
175    CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
176    LDFLAGS += -Wl,-warn-common
177    STRIPCMD:=echo
178    #$(STRIP) -s --remove-section=.note --remove-section=.comment
179endif
180ifeq ($(strip $(CONFIG_STATIC)),y)
181    LDFLAGS += --static
182endif
183
184ifeq ($(strip $(CONFIG_SELINUX)),y)
185    LIBRARIES += -lselinux
186endif
187
188ifeq ($(strip $(PREFIX)),)
189    PREFIX:=`pwd`/_install
190endif
191
192# Additional complications due to support for pristine source dir.
193# Include files in the build directory should take precedence over
194# the copy in top_srcdir, both during the compilation phase and the
195# shell script that finds the list of object files.
196# Work in progress by <ldoolitt@recycle.lbl.gov>.
197
198
199OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
200CFLAGS    += $(CROSS_CFLAGS)
201ifdef BB_INIT_SCRIPT
202    CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
203endif
204
205# Put user-supplied flags at the end, where they
206# have a chance of winning.
207CFLAGS += $(CFLAGS_EXTRA)
208
209#------------------------------------------------------------
210# Installation options
211ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
212INSTALL_OPTS=--hardlinks
213endif
214ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
215INSTALL_OPTS=--symlinks
216endif
217ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
218INSTALL_OPTS=
219endif
220
221.PHONY: dummy
222