1 # Rules.make for busybox
3 # Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
5 # Licensed under GPLv2, see the file LICENSE in this tarball for details.
8 # Pull in the user's busybox configuration
9 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
10 -include $(top_builddir)/.config
13 #--------------------------------------------------------
19 VERSION :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
20 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
23 #--------------------------------------------------------
24 # With a modern GNU make(1) (highly recommended, that's what all the
25 # developers use), all of the following configuration values can be
26 # overridden at the command line. For example:
27 # make CROSS=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
28 #--------------------------------------------------------
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
34 CROSS =$(subst ",, $(strip $(CROSS_COMPILER_PREFIX)))
42 # MAKEFILES = $(top_builddir)/.config
53 # What OS are you compiling busybox for? This allows you to include
54 # OS specific things, syscall overrides, etc.
57 # Select the compiler needed to build binaries for your development system
59 HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
61 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
64 # If you want to add some simple compiler switches (like -march=i686),
65 # especially from the command line, use this instead of CFLAGS directly.
66 # For optimization overrides, it's better still to set OPTIMIZATION.
67 CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
69 # To compile vs some other alternative libc, you may need to use/adjust
70 # the following lines to meet your needs...
72 # If you are using Red Hat 6.x with the compatible RPMs (for developing under
73 # Red Hat 5.x and glibc 2.0) uncomment the following. Be sure to read about
74 # using the compatible RPMs (compat-*) at http://www.redhat.com !
75 #LIBCDIR:=/usr/i386-glibc20-linux
77 # For other libraries, you are on your own. But these may (or may not) help...
79 #LIBRARIES:=$(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")
83 WARNINGS=-Wall -Wstrict-prototypes -Wshadow
84 CFLAGS+=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
89 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
90 # get the CC MAJOR/MINOR version
91 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
92 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
94 #--------------------------------------------------------
95 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
96 ifeq ($(strip $(TARGET_ARCH)),)
97 TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
99 -e 's/sparc.*/sparc/' \
101 -e 's/m68k.*/m68k/' \
102 -e 's/ppc/powerpc/g' \
103 -e 's/v850.*/v850/g' \
105 -e 's/mips-.*/mips/' \
106 -e 's/mipsel-.*/mipsel/' \
107 -e 's/cris.*/cris/' \
111 # A nifty macro to make testing gcc features easier
113 if [ "$(1)" != "" ]; then \
114 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
115 then echo "$(1)"; else echo "$(2)"; fi \
118 # A not very robust macro to check for available ld flags
120 if [ "x$(1)" != "x" ]; then \
121 $(LD) --help | grep -q "\$(1)" && echo "-Wl,$(1)" ; \
124 CFLAGS+=$(call check_gcc,-funsigned-char,)
126 CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
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...
133 # use '-Os' optimization if available, else use -O2
134 OPTIMIZATION:=$(call check_gcc,-Os,-O2)
136 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
137 # gcc 2.95 exits with 0 for "unrecognized option"
138 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
139 OPTIMIZATION+=$(call check_gcc,--combine,)
141 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
142 PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
143 endif # CONFIG_BUILD_AT_ONCE
145 LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
146 #LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
147 #LIB_LDFLAGS+=$(call check_ld,--as-needed,)
148 #LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)
151 # Some nice architecture specific optimizations
152 ifeq ($(strip $(TARGET_ARCH)),arm)
153 OPTIMIZATION+=-fstrict-aliasing
155 ifeq ($(strip $(TARGET_ARCH)),i386)
156 OPTIMIZATION+=$(call check_gcc,-march=i386,)
157 # gcc-4.0 and older seem to suffer from these
158 ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
159 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
160 OPTIMIZATION+=$(call check_gcc,-falign-functions=0 -falign-jumps=0 -falign-loops=0,\
161 -malign-functions=0 -malign-jumps=0 -malign-loops=0)
162 endif # gcc-4.0 and older
164 # gcc-4.1 and beyond seem to benefit from these
165 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
166 # turn off flags which hurt -Os
167 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
168 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
169 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
171 OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
172 endif # gcc-4.1 and beyond
174 OPTIMIZATIONS:=$(OPTIMIZATION) $(call check_gcc,-fomit-frame-pointer,)
177 #--------------------------------------------------------
178 # If you're going to do a lot of builds with a non-vanilla configuration,
179 # it makes sense to adjust parameters above, so you can type "make"
180 # by itself, instead of following it by the same half-dozen overrides
181 # every time. The stuff below, on the other hand, is probably less
182 # prone to casual user adjustment.
185 ifeq ($(strip $(CONFIG_LFS)),y)
186 # For large file summit support
187 CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
189 ifeq ($(strip $(CONFIG_DMALLOC)),y)
190 # For testing mem leaks with dmalloc
194 ifeq ($(strip $(CONFIG_EFENCE)),y)
198 ifeq ($(strip $(CONFIG_DEBUG)),y)
199 CFLAGS +=$(WARNINGS) -g -D_GNU_SOURCE
200 LDFLAGS += $(call check_ld,--warn-common,)
201 STRIPCMD:=/bin/true -Not_stripping_since_we_are_debugging
203 CFLAGS+=$(WARNINGS) $(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
204 LDFLAGS += $(call check_ld,--warn-common,)
205 LDFLAGS += $(call check_ld,--sort-common,)
206 STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
208 ifeq ($(strip $(CONFIG_STATIC)),y)
209 PROG_CFLAGS += $(call check_gcc,-static,)
211 CFLAGS_SHARED += $(call check_gcc,-shared,)
212 LIB_CFLAGS+=$(CFLAGS_SHARED)
214 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
215 CFLAGS_PIC:= $(call check_gcc,-fPIC,)
218 ifeq ($(strip $(CONFIG_SELINUX)),y)
219 LIBRARIES += -lselinux
222 ifeq ($(strip $(PREFIX)),)
223 PREFIX:=`pwd`/_install
226 # Additional complications due to support for pristine source dir.
227 # Include files in the build directory should take precedence over
228 # the copy in top_srcdir, both during the compilation phase and the
229 # shell script that finds the list of object files.
230 # Work in progress by <ldoolitt@recycle.lbl.gov>.
233 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
234 CFLAGS += $(CROSS_CFLAGS)
236 CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
239 # Put user-supplied flags at the end, where they
240 # have a chance of winning.
241 CFLAGS += $(CFLAGS_EXTRA)
243 #------------------------------------------------------------
244 # Installation options
245 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
246 INSTALL_OPTS=--hardlinks
248 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
249 INSTALL_OPTS=--symlinks
251 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
255 #------------------------------------------------------------
256 # Make the output nice and tight
257 MAKEFLAGS += --no-print-directory
258 export MAKE_IS_SILENT=n
259 ifneq ($(findstring s,$(MAKEFLAGS)),)
260 export MAKE_IS_SILENT=y
265 ifneq ($(V)$(VERBOSE),)
276 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
277 pur_disp_compile.c = echo " "CC $(show_objs)
278 pur_disp_compile.h = echo " "HOSTCC $(show_objs)
279 pur_disp_strip = echo " "STRIP $(show_objs)
280 pur_disp_link = echo " "LINK $(show_objs)
281 pur_disp_ar = echo " "AR $(ARFLAGS) $(show_objs)
282 sil_disp_compile.c = true
283 sil_disp_compile.h = true
284 sil_disp_strip = true
287 ver_disp_compile.c = echo $(cmd_compile.c)
288 ver_disp_compile.h = echo $(cmd_compile.h)
289 ver_disp_strip = echo $(cmd_strip)
290 ver_disp_link = echo $(cmd_link)
291 ver_disp_ar = echo $(cmd_ar)
292 disp_compile.c = $($(DISP)_disp_compile.c)
293 disp_compile.h = $($(DISP)_disp_compile.h)
294 disp_strip = $($(DISP)_disp_strip)
295 disp_link = $($(DISP)_disp_link)
296 disp_ar = $($(DISP)_disp_ar)
297 disp_gen = $(SECHO) " "GEN $@ ; true
298 disp_doc = $(SECHO) " "DOC $(subst docs/,,$@) ; true
299 cmd_compile.c = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
300 cmd_compile.h = $(HOSTCC) $(HOSTCFLAGS) -c -o $@ $<
301 cmd_strip = $(STRIPCMD) $@
302 cmd_link = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS)
303 cmd_ar = $(AR) $(ARFLAGS) $@ $^
304 compile.c = @$(disp_compile.c) ; $(cmd_compile.c)
305 compile.h = @$(disp_compile.h) ; $(cmd_compile.h)
306 do_strip = @$(disp_strip) ; $(cmd_strip)
307 do_link = @$(disp_link) ; $(cmd_link)
308 do_ar = @$(disp_ar) ; $(cmd_ar)