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 =$(strip $(subst ",, $(strip $(CROSS_COMPILER_PREFIX))))
35 # be gentle to vi coloring.. "))
42 ELF2FLT = $(CROSS)elf2flt
48 # What OS are you compiling busybox for? This allows you to include
49 # OS specific things, syscall overrides, etc.
52 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
55 # If you want to add some simple compiler switches (like -march=i686),
56 # especially from the command line, use this instead of CFLAGS directly.
57 # For optimization overrides, it's better still to set OPTIMIZATION.
58 CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
59 # be gentle to vi coloring.. ")
61 # To compile vs some other alternative libc, you may need to use/adjust
62 # the following lines to meet your needs...
64 # If you are using Red Hat 6.x with the compatible RPMs (for developing under
65 # Red Hat 5.x and glibc 2.0) uncomment the following. Be sure to read about
66 # using the compatible RPMs (compat-*) at http://www.redhat.com !
67 #LIBCDIR:=/usr/i386-glibc20-linux
69 # For other libraries, you are on your own. But these may (or may not) help...
71 #LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
72 #CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
73 #GCCINCDIR:=$(shell gcc -print-search-dirs | $(SED) -ne "s/install: \(.*\)/\1include/gp")
75 # This must bind late because srcdir is reset for every source subdirectory.
76 INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
77 CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
78 CFLAGS+=$(CHECKED_CFLAGS)
81 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
82 # get the CC MAJOR/MINOR version
83 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
84 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
86 #--------------------------------------------------------
87 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
88 ifeq ($(strip $(TARGET_ARCH)),)
89 TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
91 -e 's/sparc.*/sparc/' \
94 -e 's/ppc/powerpc/g' \
95 -e 's/v850.*/v850/g' \
97 -e 's/mips-.*/mips/' \
98 -e 's/mipsel-.*/mipsel/' \
103 # A nifty macro to make testing gcc features easier, but note that everything
104 # that uses this _must_ use := or it will be re-evaluated everytime it is
106 ifeq ($(strip $(BUILD_VERBOSE)),2)
107 VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
110 $(VERBOSE_CHECK_CC) \
111 if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
112 echo "int i;" > ./conftest.c; \
113 if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
114 then echo "$(2)"; else echo "$(3)"; fi ; \
115 rm -f conftest.c conftest.o; \
118 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
122 # A not very robust macro to check for available ld flags
123 ifeq ($(strip $(BUILD_VERBOSE)),2)
124 VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
127 $(VERBOSE_CHECK_LD) \
128 if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
129 $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
133 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
137 # A not very robust macro to check for available strip flags
138 ifeq ($(strip $(BUILD_VERBOSE)),2)
139 VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
141 check_strip=$(shell \
142 $(VERBOSE_CHECK_STRIP) \
143 if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
144 echo "int i;" > ./conftest.c ; \
145 $(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
146 $(1) $(2) conftest.o > /dev/null 2>&1 && \
147 echo "$(1) $(2)" || echo "$(3)"; \
148 rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
151 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
156 # Select the compiler needed to build binaries for your development system
158 HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
159 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
160 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
161 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
163 LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
164 $(CC) -c -o conftest.o conftest.c ; \
165 echo "int main(void){return 0;}" > conftest_main.c ; \
166 $(CC) -c -o conftest_main.o conftest_main.c ; \
167 $(AR) $(ARFLAGS) conftest.a conftest.o ; \
168 $(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
169 conftest_main.o -o conftest > /dev/null 2>&1 \
170 && echo "-Wl,--whole-archive" ; \
171 rm conftest_main.o conftest_main.c conftest.o conftest.c \
172 conftest.a conftest > /dev/null 2>&1 ; )
173 ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
174 LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
177 LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
178 $(CC) -c -o conftest.o conftest.c ; \
179 echo "int main(void){return bar();}" > conftest_main.c ; \
180 $(CC) -c -o conftest_main.o conftest_main.c ; \
181 $(AR) $(ARFLAGS) conftest.a conftest.o ; \
182 $(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
183 -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
184 rm conftest_main.o conftest_main.c conftest.o conftest.c \
185 conftest.a conftest > /dev/null 2>&1 ; )
186 ifneq ($(findstring start-group,$(LD_START_GROUP)),)
187 LD_END_GROUP:= -Wl,--end-group
190 CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
192 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
193 CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
194 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
195 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
196 CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
197 CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
198 CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
200 # Preemptively pin this too.
204 #--------------------------------------------------------
205 # Arch specific compiler optimization stuff should go here.
206 # Unless you want to override the defaults, do not set anything
207 # for OPTIMIZATION...
209 # use '-Os' optimization if available, else use -O2
210 OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
212 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
213 # gcc 2.95 exits with 0 for "unrecognized option"
214 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
215 CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
217 OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
218 OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
219 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
220 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
221 # This prevents us from using -fwhole-program when we build the lib
222 PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
223 endif # CONFIG_BUILD_LIBBUSYBOX
224 endif # CONFIG_BUILD_AT_ONCE
226 LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
227 #LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
228 #LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
229 #LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
232 # Some nice architecture specific optimizations
233 ifeq ($(strip $(TARGET_ARCH)),arm)
234 OPTIMIZATION+=-fstrict-aliasing
236 ifeq ($(strip $(TARGET_ARCH)),i386)
237 OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
238 # gcc-4.0 and older seem to benefit from these
239 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
240 OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
241 OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
242 -malign-functions=0 -malign-jumps=0 -malign-loops=0)
243 #endif # gcc-4.0 and older
245 # gcc-4.1 and beyond seem to benefit from these
246 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
247 # turn off flags which hurt -Os
248 OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
249 OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
250 OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
252 OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
253 endif # gcc-4.1 and beyond
255 OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
256 OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)
259 #--------------------------------------------------------
260 # If you're going to do a lot of builds with a non-vanilla configuration,
261 # it makes sense to adjust parameters above, so you can type "make"
262 # by itself, instead of following it by the same half-dozen overrides
263 # every time. The stuff below, on the other hand, is probably less
264 # prone to casual user adjustment.
267 ifeq ($(strip $(CONFIG_LFS)),y)
268 # For large file summit support
269 CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
271 ifeq ($(strip $(CONFIG_DMALLOC)),y)
272 # For testing mem leaks with dmalloc
276 ifeq ($(strip $(CONFIG_EFENCE)),y)
283 ifeq ($(strip $(CONFIG_DEBUG)),y)
287 CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
288 CHECKED_LDFLAGS += $(call check_ld,--gc-sections,)
291 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
292 CFLAGS += $(OPTIMIZATION)
295 # warn a bit more verbosely for non-release versions
296 ifneq ($(EXTRAVERSION),)
297 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
298 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
299 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
300 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
301 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
302 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
303 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
305 STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
306 ifeq ($(strip $(CONFIG_STATIC)),y)
307 PROG_CFLAGS += $(call check_cc,$(CC),-static,)
309 CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
310 LIB_CFLAGS+=$(CFLAGS_SHARED)
312 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
313 CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
314 LIB_CFLAGS+=$(CFLAGS_PIC)
317 ifeq ($(strip $(CONFIG_SELINUX)),y)
318 LIBRARIES += -lselinux
321 ifeq ($(strip $(PREFIX)),)
322 PREFIX:=`pwd`/_install
325 ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
326 CFLAGS += -D__need_getopt
329 # Additional complications due to support for pristine source dir.
330 # Include files in the build directory should take precedence over
331 # the copy in top_srcdir, both during the compilation phase and the
332 # shell script that finds the list of object files.
333 # Work in progress by <ldoolitt@recycle.lbl.gov>.
336 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
337 CFLAGS += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
338 LDFLAGS += $(CHECKED_LDFLAGS)
341 CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
344 # Put user-supplied flags at the end, where they
345 # have a chance of winning.
346 CFLAGS += $(CFLAGS_EXTRA)
348 #------------------------------------------------------------
349 # Installation options
350 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
351 INSTALL_OPTS=--hardlinks
353 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
354 INSTALL_OPTS=--symlinks
356 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
360 #------------------------------------------------------------
361 # Make the output nice and tight
362 MAKEFLAGS += --no-print-directory
363 export MAKE_IS_SILENT=n
364 ifneq ($(findstring s,$(MAKEFLAGS)),)
365 export MAKE_IS_SILENT=y
370 ifneq ($(BUILD_VERBOSE),)
381 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
382 pur_disp_compile.c = echo " "CC $(show_objs)
383 pur_disp_compile.h = echo " "HOSTCC $(show_objs)
384 pur_disp_strip = echo " "STRIP $(show_objs)
385 pur_disp_link = echo " "LINK $(show_objs)
386 pur_disp_link.h = echo " "HOSTLINK $(show_objs)
387 pur_disp_ar = echo " "AR $(ARFLAGS) $(show_objs)
388 pur_disp_elf2flt = echo " "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
389 sil_disp_compile.c = true
390 sil_disp_compile.h = true
391 sil_disp_strip = true
393 sil_disp_link.h = true
395 sil_disp_elf2flt = true
396 ver_disp_compile.c = echo $(cmd_compile.c)
397 ver_disp_compile.h = echo $(cmd_compile.h)
398 ver_disp_strip = echo $(cmd_strip)
399 ver_disp_link = echo $(cmd_link)
400 ver_disp_link.h = echo $(cmd_link.h)
401 ver_disp_ar = echo $(cmd_ar)
402 ver_disp_elf2flt = echo $(cmd_elf2flt)
403 disp_compile.c = $($(DISP)_disp_compile.c)
404 disp_compile.h = $($(DISP)_disp_compile.h)
405 disp_strip = $($(DISP)_disp_strip)
406 disp_link = $($(DISP)_disp_link)
407 disp_link.h = $($(DISP)_disp_link.h)
408 disp_ar = $($(DISP)_disp_ar)
409 disp_gen = $(SECHO) " "GEN $@ ; true
410 disp_doc = $(SECHO) " "DOC $(subst docs/,,$@) ; true
411 disp_elf2flt = $($(DISP)_disp_elf2flt)
412 cmd_compile.c = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
413 cmd_compile.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
414 cmd_strip = $(STRIPCMD) $@
415 cmd_link = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
416 $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
417 -o $@ $(LD_START_GROUP) \
418 $(APPLETS_DEFINE) $(APPLET_SRC) \
419 $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
420 $(LDBUSYBOX) $(LIBRARIES) \
422 cmd_link.so = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
423 $(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
424 -o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
425 $(LIBRARY_DEFINE) $(^) \
426 $(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
427 cmd_link.h = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
428 cmd_ar = $(AR) $(ARFLAGS) $@ $^
429 cmd_elf2flt = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
430 compile.c = @$(disp_compile.c) ; $(cmd_compile.c)
431 compile.h = @$(disp_compile.h) ; $(cmd_compile.h)
432 do_strip = @$(disp_strip) ; $(cmd_strip)
433 do_link = @$(disp_link) ; $(cmd_link)
434 do_link.so = @$(disp_link) ; $(cmd_link.so)
435 do_link.h = @$(disp_link.h) ; $(cmd_link.h)
436 do_ar = @$(disp_ar) ; $(cmd_ar)
437 do_elf2flt = @$(disp_elf2flt) ; $(cmd_elf2flt)
439 uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
441 @if test -z "$($(call uppercase,$*)_DIR)" ; then \
442 echo "Invalid target $@" ; \
445 $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@