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)))
41 ELF2FLT = $(CROSS)elf2flt
46 # What OS are you compiling busybox for? This allows you to include
47 # OS specific things, syscall overrides, etc.
50 # Select the compiler needed to build binaries for your development system
52 HOSTCFLAGS= -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
54 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
57 # If you want to add some simple compiler switches (like -march=i686),
58 # especially from the command line, use this instead of CFLAGS directly.
59 # For optimization overrides, it's better still to set OPTIMIZATION.
60 CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
62 # To compile vs some other alternative libc, you may need to use/adjust
63 # the following lines to meet your needs...
65 # If you are using Red Hat 6.x with the compatible RPMs (for developing under
66 # Red Hat 5.x and glibc 2.0) uncomment the following. Be sure to read about
67 # using the compatible RPMs (compat-*) at http://www.redhat.com !
68 #LIBCDIR:=/usr/i386-glibc20-linux
70 # For other libraries, you are on your own. But these may (or may not) help...
72 #LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
73 #CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
74 #GCCINCDIR:=$(shell gcc -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
76 # This must bind late because srcdir is reset for every source subdirectory.
77 CFLAGS=-I$(top_builddir)/include -I$(top_srcdir)/include -I$(srcdir)
78 CFLAGS+=$(CHECKED_CFLAGS)
83 CFLAGS+=-Wall -Wstrict-prototypes -Wshadow
85 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
86 # get the CC MAJOR/MINOR version
87 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
88 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
90 #--------------------------------------------------------
91 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
92 ifeq ($(strip $(TARGET_ARCH)),)
93 TARGET_ARCH:=$(shell $(CC) -dumpmachine | sed -e s'/-.*//' \
95 -e 's/sparc.*/sparc/' \
98 -e 's/ppc/powerpc/g' \
99 -e 's/v850.*/v850/g' \
101 -e 's/mips-.*/mips/' \
102 -e 's/mipsel-.*/mipsel/' \
103 -e 's/cris.*/cris/' \
107 # A nifty macro to make testing gcc features easier, but note that everything
108 # that uses this _must_ use := or it will be re-evaluated for every file.
109 ifeq ($(strip $(V)),2)
110 VERBOSE_CHECK_GCC=echo check_gcc $(1) >> /dev/stderr;
113 $(VERBOSE_CHECK_GCC)\
114 if [ "$(1)" != "" ]; then \
115 if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
116 then echo "$(1)"; else echo "$(2)"; fi \
119 # A not very robust macro to check for available ld flags
121 if [ "x$(1)" != "x" ]; then \
122 $(LD) --help | grep -q "\$(1)" && echo "-Wl,$(1)" ; \
125 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
126 CHECKED_CFLAGS:=$(call check_gcc,-funsigned-char,)
127 CHECKED_CFLAGS+=$(call check_gcc,-mmax-stack-frame=256,)
129 # Preemptively pin this too.
133 #--------------------------------------------------------
134 # Arch specific compiler optimization stuff should go here.
135 # Unless you want to override the defaults, do not set anything
136 # for OPTIMIZATION...
138 # use '-Os' optimization if available, else use -O2
139 OPTIMIZATION:=$(call check_gcc,-Os,-O2)
141 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
142 # gcc 2.95 exits with 0 for "unrecognized option"
143 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
144 CFLAGS_COMBINE:=$(call check_gcc,--combine,)
146 OPTIMIZATION+=$(call check_gcc,-funit-at-a-time,)
147 OPTIMIZATION+=$(call check_gcc,-fgcse-after-reload,)
148 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
149 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
150 # This prevents us from using -fwhole-program when we build the lib
151 PROG_CFLAGS+=$(call check_gcc,-fwhole-program,)
152 endif # CONFIG_BUILD_LIBBUSYBOX
153 endif # CONFIG_BUILD_AT_ONCE
155 LIB_LDFLAGS:=$(call check_ld,--enable-new-dtags,)
156 #LIB_LDFLAGS+=$(call check_ld,--reduce-memory-overheads,)
157 #LIB_LDFLAGS+=$(call check_ld,--as-needed,)
158 #LIB_LDFLAGS+=$(call check_ld,--warn-shared-textrel,)
161 # Some nice architecture specific optimizations
162 ifeq ($(strip $(TARGET_ARCH)),arm)
163 OPTIMIZATION+=-fstrict-aliasing
165 ifeq ($(strip $(TARGET_ARCH)),i386)
166 OPTIMIZATION+=$(call check_gcc,-march=i386,)
167 # gcc-4.0 and older seem to benefit from these
168 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
169 OPTIMIZATION+=$(call check_gcc,-mpreferred-stack-boundary=2,)
170 OPTIMIZATION+=$(call check_gcc,-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
171 -malign-functions=0 -malign-jumps=0 -malign-loops=0)
172 #endif # gcc-4.0 and older
174 # gcc-4.1 and beyond seem to benefit from these
175 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
176 # turn off flags which hurt -Os
177 OPTIMIZATION+=$(call check_gcc,-fno-tree-loop-optimize,)
178 OPTIMIZATION+=$(call check_gcc,-fno-tree-dominator-opts,)
179 OPTIMIZATION+=$(call check_gcc,-fno-strength-reduce,)
181 OPTIMIZATION+=$(call check_gcc,-fno-branch-count-reg,)
182 endif # gcc-4.1 and beyond
184 OPTIMIZATIONS:=$(OPTIMIZATION) $(call check_gcc,-fomit-frame-pointer,)
187 #--------------------------------------------------------
188 # If you're going to do a lot of builds with a non-vanilla configuration,
189 # it makes sense to adjust parameters above, so you can type "make"
190 # by itself, instead of following it by the same half-dozen overrides
191 # every time. The stuff below, on the other hand, is probably less
192 # prone to casual user adjustment.
195 ifeq ($(strip $(CONFIG_LFS)),y)
196 # For large file summit support
197 CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
199 ifeq ($(strip $(CONFIG_DMALLOC)),y)
200 # For testing mem leaks with dmalloc
204 ifeq ($(strip $(CONFIG_EFENCE)),y)
208 ifeq ($(strip $(CONFIG_DEBUG)),y)
209 CFLAGS +=-g -D_GNU_SOURCE
210 LDFLAGS += $(call check_ld,--warn-common,)
212 CFLAGS+=$(OPTIMIZATIONS) -D_GNU_SOURCE -DNDEBUG
213 LDFLAGS += $(call check_ld,--warn-common,)
214 LDFLAGS += $(call check_ld,--sort-common,)
216 # warn a bit more verbosely for non-release versions
217 ifneq ($(EXTRAVERSION),)
218 CHECKED_CFLAGS+=$(call check_gcc,-Wstrict-prototypes,)
219 CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-prototypes,)
220 CHECKED_CFLAGS+=$(call check_gcc,-Wmissing-declarations,)
221 CHECKED_CFLAGS+=$(call check_gcc,-Wunused,)
222 CHECKED_CFLAGS+=$(call check_gcc,-Winit-self,)
223 CHECKED_CFLAGS+=$(call check_gcc,-Wshadow,)
224 CHECKED_CFLAGS+=$(call check_gcc,-Wcast-align,)
226 STRIPCMD:=$(STRIP) -s --remove-section=.note --remove-section=.comment
227 ifeq ($(strip $(CONFIG_STATIC)),y)
228 PROG_CFLAGS += $(call check_gcc,-static,)
230 CFLAGS_SHARED := $(call check_gcc,-shared,)
231 LIB_CFLAGS+=$(CFLAGS_SHARED)
233 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
234 CFLAGS_PIC:= $(call check_gcc,-fPIC,)
235 LIB_CFLAGS+=$(CFLAGS_PIC)
239 ifeq ($(strip $(CONFIG_SELINUX)),y)
240 LIBRARIES += -lselinux
243 ifeq ($(strip $(PREFIX)),)
244 PREFIX:=`pwd`/_install
247 # Additional complications due to support for pristine source dir.
248 # Include files in the build directory should take precedence over
249 # the copy in top_srcdir, both during the compilation phase and the
250 # shell script that finds the list of object files.
251 # Work in progress by <ldoolitt@recycle.lbl.gov>.
254 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
255 CFLAGS += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
257 CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
260 # Put user-supplied flags at the end, where they
261 # have a chance of winning.
262 CFLAGS += $(CFLAGS_EXTRA)
264 #------------------------------------------------------------
265 # Installation options
266 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
267 INSTALL_OPTS=--hardlinks
269 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
270 INSTALL_OPTS=--symlinks
272 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
276 #------------------------------------------------------------
277 # Make the output nice and tight
278 MAKEFLAGS += --no-print-directory
279 export MAKE_IS_SILENT=n
280 ifneq ($(findstring s,$(MAKEFLAGS)),)
281 export MAKE_IS_SILENT=y
286 ifneq ($(V)$(VERBOSE),)
297 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
298 pur_disp_compile.c = echo " "CC $(show_objs)
299 pur_disp_compile.h = echo " "HOSTCC $(show_objs)
300 pur_disp_strip = echo " "STRIP $(show_objs)
301 pur_disp_link = echo " "LINK $(show_objs)
302 pur_disp_ar = echo " "AR $(ARFLAGS) $(show_objs)
303 pur_disp_elf2flt = echo " "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
304 sil_disp_compile.c = true
305 sil_disp_compile.h = true
306 sil_disp_strip = true
309 sil_disp_elf2flt = true
310 ver_disp_compile.c = echo $(cmd_compile.c)
311 ver_disp_compile.h = echo $(cmd_compile.h)
312 ver_disp_strip = echo $(cmd_strip)
313 ver_disp_link = echo $(cmd_link)
314 ver_disp_ar = echo $(cmd_ar)
315 ver_disp_elf2flt = echo $(cmd_elf2flt)
316 disp_compile.c = $($(DISP)_disp_compile.c)
317 disp_compile.h = $($(DISP)_disp_compile.h)
318 disp_strip = $($(DISP)_disp_strip)
319 disp_link = $($(DISP)_disp_link)
320 disp_ar = $($(DISP)_disp_ar)
321 disp_gen = $(SECHO) " "GEN $@ ; true
322 disp_doc = $(SECHO) " "DOC $(subst docs/,,$@) ; true
323 disp_elf2flt = $($(DISP)_disp_elf2flt)
324 cmd_compile.c = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
325 cmd_compile.h = $(HOSTCC) $(HOSTCFLAGS) -c -o $@ $<
326 cmd_strip = $(STRIPCMD) $@
327 cmd_link = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS)
328 cmd_ar = $(AR) $(ARFLAGS) $@ $^
329 cmd_elf2flt = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
330 compile.c = @$(disp_compile.c) ; $(cmd_compile.c)
331 compile.h = @$(disp_compile.h) ; $(cmd_compile.h)
332 do_strip = @$(disp_strip) ; $(cmd_strip)
333 do_link = @$(disp_link) ; $(cmd_link)
334 do_ar = @$(disp_ar) ; $(cmd_ar)
335 do_elf2flt = @$(disp_elf2flt) ; $(cmd_elf2flt)