Rules.mak

   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
   9 ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
  10 -include $(top_builddir)/.config
  11 endif
  12
  13 #--------------------------------------------------------
  14 PROG      := busybox
  15 MAJOR_VERSION   :=1
  16 MINOR_VERSION   :=2
  17 SUBLEVEL_VERSION:=0
  18 EXTRAVERSION    :=-svn
  19 VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
  20 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
  21
  22
  23 #--------------------------------------------------------
  24 # With a modern GNU make(1) (highly recommended, that's what all the
  25 # developers use), all of the following configuration values can be
  26 # overridden at the command line.  For example:
  27 #   make CROSS_COMPILE=powerpc-linux- top_srcdir="$HOME/busybox" PREFIX=/mnt/app
  28 #--------------------------------------------------------
  29
  30 # If you are running a cross compiler, you will want to set CROSS_COMPILE
  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 CC             = $(CROSS_COMPILE)gcc
  35 AR             = $(CROSS_COMPILE)ar
  36 AS             = $(CROSS_COMPILE)as
  37 LD             = $(CROSS_COMPILE)ld
  38 NM             = $(CROSS_COMPILE)nm
  39 STRIP          = $(CROSS_COMPILE)strip
  40 ELF2FLT        = $(CROSS_COMPILE)elf2flt
  41 CPP            = $(CC) -E
  42 SED           ?= sed
  43 BZIP2         ?= bzip2
  44
  45
  46 # What OS are you compiling busybox for?  This allows you to include
  47 # OS specific things, syscall overrides, etc.
  48 TARGET_OS=linux
  49
  50 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  51 LC_ALL:= C
  52
  53 # This must bind late because srcdir is reset for every source subdirectory.
  54 INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
  55 CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
  56 CFLAGS+=$(CHECKED_CFLAGS)
  57 ARFLAGS=cru
  58
  59 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
  60 # get the CC MAJOR/MINOR version
  61 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
  62 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
  63
  64 #--------------------------------------------------------
  65 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS_COMPILE CC AR AS LD NM STRIP CPP
  66 ifeq ($(strip $(TARGET_ARCH)),)
  67 TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
  68                 -e 's/i.86/i386/' \
  69                 -e 's/sparc.*/sparc/' \
  70                 -e 's/arm.*/arm/g' \
  71                 -e 's/m68k.*/m68k/' \
  72                 -e 's/ppc/powerpc/g' \
  73                 -e 's/v850.*/v850/g' \
  74                 -e 's/sh[234]/sh/' \
  75                 -e 's/mips-.*/mips/' \
  76                 -e 's/mipsel-.*/mipsel/' \
  77                 -e 's/cris.*/cris/' \
  78                 )
  79 endif
  80
  81 # A nifty macro to make testing gcc features easier, but note that everything
  82 # that uses this _must_ use := or it will be re-evaluated everytime it is
  83 # referenced.
  84 ifeq ($(strip $(BUILD_VERBOSE)),2)
  85 VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
  86 endif
  87 check_cc=$(shell \
  88         $(VERBOSE_CHECK_CC) \
  89         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
  90                 echo "int i;" > ./conftest.c; \
  91                 if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
  92                 then echo "$(2)"; else echo "$(3)"; fi ; \
  93                 rm -f conftest.c conftest.o; \
  94         fi)
  95
  96 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
  97 check_cc:=
  98 endif
  99
 100 # A not very robust macro to check for available ld flags
 101 ifeq ($(strip $(BUILD_VERBOSE)),2)
 102 VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
 103 endif
 104 check_ld=$(shell \
 105         $(VERBOSE_CHECK_LD) \
 106         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 107                 $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
 108                 echo "-Wl,$(2)" ; \
 109         fi)
 110
 111 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 112 check_ld:=
 113 endif
 114
 115 # A not very robust macro to check for available strip flags
 116 ifeq ($(strip $(BUILD_VERBOSE)),2)
 117 VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
 118 endif
 119 check_strip=$(shell \
 120         $(VERBOSE_CHECK_STRIP) \
 121         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 122                 echo "int i;" > ./conftest.c ; \
 123                 $(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
 124                 $(1) $(2) conftest.o > /dev/null 2>&1 && \
 125                 echo "$(1) $(2)" || echo "$(3)"; \
 126                 rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
 127         fi)
 128
 129 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 130 check_strip:=
 131 endif
 132
 133
 134 # Select the compiler needed to build binaries for your development system
 135 HOSTCC     = gcc
 136 HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
 137 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
 138 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
 139 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
 140
 141 LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
 142         $(CC) -c -o conftest.o conftest.c ; \
 143         echo "int main(void){return 0;}" > conftest_main.c ; \
 144         $(CC) -c -o conftest_main.o conftest_main.c ; \
 145         $(AR) $(ARFLAGS) conftest.a conftest.o ; \
 146         $(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
 147          conftest_main.o -o conftest > /dev/null 2>&1 \
 148          && echo "-Wl,--whole-archive" ; \
 149         rm conftest_main.o conftest_main.c conftest.o conftest.c \
 150          conftest.a conftest > /dev/null 2>&1 ; )
 151 ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
 152 LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
 153 endif
 154
 155 LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
 156         $(CC) -c -o conftest.o conftest.c ; \
 157         echo "int main(void){return bar();}" > conftest_main.c ; \
 158         $(CC) -c -o conftest_main.o conftest_main.c ; \
 159         $(AR) $(ARFLAGS) conftest.a conftest.o ; \
 160         $(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
 161          -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
 162         rm conftest_main.o conftest_main.c conftest.o conftest.c \
 163          conftest.a conftest > /dev/null 2>&1 ; )
 164 ifneq ($(findstring start-group,$(LD_START_GROUP)),)
 165 LD_END_GROUP:= -Wl,--end-group
 166 endif
 167
 168 CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
 169 #CHECKED_LDFLAGS := $(call check_ld,$(LD),-static-libgcc,)
 170
 171 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
 172 CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
 173 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 174 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 175 CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
 176 CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen,)
 177 CHECKED_CFLAGS+=$(call check_cc,$(CC),-finline-limit=0,)
 178
 179 # gcc 2.95 exits with 0 for "unrecognized option"
 180 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
 181   CHECKED_CFLAGS+=$(call check_cc,$(CC),-static-libgcc,)
 182 endif
 183
 184 # Preemptively pin this too.
 185 PROG_CFLAGS:=
 186
 187
 188 #--------------------------------------------------------
 189 # Arch specific compiler optimization stuff should go here.
 190 # Unless you want to override the defaults, do not set anything
 191 # for OPTIMIZATION...
 192
 193 # use '-Os' optimization if available, else use -O2
 194 OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
 195
 196 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
 197 # gcc 2.95 exits with 0 for "unrecognized option"
 198 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
 199         CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
 200 endif
 201 OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
 202 OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
 203 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 204 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 205 # This prevents us from using -fwhole-program when we build the lib
 206 PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
 207 endif # CONFIG_BUILD_LIBBUSYBOX
 208 endif # CONFIG_BUILD_AT_ONCE
 209
 210 LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
 211 #LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
 212 #LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
 213 #LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
 214
 215
 216 # Some nice architecture specific optimizations
 217 ifeq ($(strip $(TARGET_ARCH)),arm)
 218         OPTIMIZATION+=-fstrict-aliasing
 219 endif
 220 ifeq ($(strip $(TARGET_ARCH)),i386)
 221         OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
 222 # gcc-4.0 and older seem to benefit from these
 223 ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 224         OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
 225         OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1, -malign-functions=0 -malign-jumps=0 -malign-loops=0,)
 226
 227         # gcc 4.1 produces many broken, totally invalid warnings
 228         CHECKED_CFLAGS+=$(call check_cc,$(CC),-Werror,)
 229 endif # gcc-4.0 and older
 230
 231 # gcc-4.1 and beyond seem to benefit from these
 232 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 233         # turn off flags which hurt -Os
 234         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
 235         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
 236         OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
 237
 238         OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
 239 endif # gcc-4.1 and beyond
 240 endif
 241 OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
 242 CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 243
 244 #
 245 #--------------------------------------------------------
 246 # If you're going to do a lot of builds with a non-vanilla configuration,
 247 # it makes sense to adjust parameters above, so you can type "make"
 248 # by itself, instead of following it by the same half-dozen overrides
 249 # every time.  The stuff below, on the other hand, is probably less
 250 # prone to casual user adjustment.
 251 #
 252
 253 ifeq ($(strip $(CONFIG_LFS)),y)
 254     # For large file summit support
 255     CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 256 endif
 257 ifeq ($(strip $(CONFIG_DMALLOC)),y)
 258     # For testing mem leaks with dmalloc
 259     CFLAGS+=-DDMALLOC
 260     LIBRARIES:=-ldmalloc
 261 else
 262     ifeq ($(strip $(CONFIG_EFENCE)),y)
 263         LIBRARIES:=-lefence
 264     endif
 265 endif
 266
 267 # Debugging info
 268
 269 ifeq ($(strip $(CONFIG_DEBUG)),y)
 270     CFLAGS +=-g
 271 else
 272     CFLAGS +=-DNDEBUG
 273 endif
 274
 275 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
 276     CFLAGS += $(OPTIMIZATION)
 277 endif
 278
 279 # warn a bit more verbosely for non-release versions
 280 ifneq ($(EXTRAVERSION),)
 281     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 282     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
 283     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
 284     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
 285     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
 286     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 287     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 288 endif
 289 STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 290 ifeq ($(strip $(CONFIG_STATIC)),y)
 291     PROG_CFLAGS += $(call check_cc,$(CC),-static,)
 292 else
 293     ifneq ($(strip $(CONFIG_DEBUG)),y)
 294         OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)
 295         CHECKED_LDFLAGS += $(call check_ld,$(LD),--gc-sections,)
 296     endif
 297 endif
 298 CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
 299 LIB_CFLAGS+=$(CFLAGS_SHARED)
 300
 301 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
 302     CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
 303     LIB_CFLAGS+=$(CFLAGS_PIC)
 304 endif
 305
 306 ifeq ($(strip $(CONFIG_SELINUX)),y)
 307     LIBRARIES += -lselinux -lsepol
 308 endif
 309
 310 ifeq ($(strip $(PREFIX)),)
 311     PREFIX:=`pwd`/_install
 312 endif
 313
 314 ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
 315     CFLAGS += -D__need_getopt
 316 endif
 317
 318 # Additional complications due to support for pristine source dir.
 319 # Include files in the build directory should take precedence over
 320 # the copy in top_srcdir, both during the compilation phase and the
 321 # shell script that finds the list of object files.
 322 # Work in progress by <ldoolitt@recycle.lbl.gov>.
 323
 324
 325 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 326 CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
 327 LDFLAGS += $(CHECKED_LDFLAGS)
 328
 329 ifdef BB_INIT_SCRIPT
 330     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 331 endif
 332
 333 # Put user-supplied flags at the end, where they
 334 # have a chance of winning.
 335 -include $(top_builddir)/.config.mak
 336
 337 #------------------------------------------------------------
 338 # Installation options
 339 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
 340 INSTALL_OPTS=--hardlinks
 341 endif
 342 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
 343 INSTALL_OPTS=--symlinks
 344 endif
 345 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
 346 INSTALL_OPTS=
 347 endif
 348
 349 #------------------------------------------------------------
 350 # Make the output nice and tight
 351 MAKEFLAGS += --no-print-directory
 352 export MAKE_IS_SILENT=n
 353 ifneq ($(findstring s,$(MAKEFLAGS)),)
 354 export MAKE_IS_SILENT=y
 355 SECHO := @-false
 356 DISP  := sil
 357 Q     := @
 358 else
 359 ifneq ($(BUILD_VERBOSE),)
 360 SECHO := @-false
 361 DISP  := ver
 362 Q     :=
 363 else
 364 SECHO := @echo
 365 DISP  := pur
 366 Q     := @
 367 endif
 368 endif
 369
 370 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
 371 pur_disp_compile.c = echo "  "CC $(show_objs) ;
 372 pur_disp_compile.h = echo "  "HOSTCC $(show_objs) ;
 373 pur_disp_strip     = echo "  "STRIP $(show_objs) ;
 374 pur_disp_link      = echo "  "LINK $(show_objs) ;
 375 pur_disp_link.h    = echo "  "HOSTLINK $(show_objs) ;
 376 pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs) ;
 377 pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs) ;
 378 sil_disp_compile.c =
 379 sil_disp_compile.h =
 380 sil_disp_strip     =
 381 sil_disp_link      =
 382 sil_disp_link.h    =
 383 sil_disp_ar        =
 384 sil_disp_elf2flt   =
 385 ver_disp_compile.c =
 386 ver_disp_compile.h =
 387 ver_disp_strip     =
 388 ver_disp_link      =
 389 ver_disp_link.h    =
 390 ver_disp_ar        =
 391 ver_disp_elf2flt   =
 392 disp_compile.c     = $(Q)$($(DISP)_disp_compile.c)
 393 disp_compile.h     = $(Q)$($(DISP)_disp_compile.h)
 394 disp_strip         = $(Q)$($(DISP)_disp_strip)
 395 disp_link          = $(Q)$($(DISP)_disp_link)
 396 disp_link.h        = $(Q)$($(DISP)_disp_link.h)
 397 disp_ar            = $(Q)$($(DISP)_disp_ar)
 398 disp_elf2flt       = $(Q)$($(DISP)_disp_elf2flt)
 399 disp_gen           = $(SECHO) "  "GEN $@ ; true
 400 disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
 401 cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
 402 cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
 403 cmd_strip          = $(STRIPCMD) $@
 404 cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 405                         $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
 406                         -o $@ $(LD_START_GROUP)  \
 407                         $(APPLETS_DEFINE) $(APPLET_SRC) \
 408                         $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
 409                         $(LDBUSYBOX) $(LIBRARIES) \
 410                         $(LD_END_GROUP)
 411 cmd_link.so        = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 412                         $(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
 413                         -o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
 414                         $(LIBRARY_DEFINE) $(^) \
 415                         $(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
 416 cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
 417 cmd_ar             = $(AR) $(ARFLAGS) $@ $^
 418 cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
 419 compile.c          = $(disp_compile.c) $(cmd_compile.c)
 420 compile.h          = $(disp_compile.h) $(cmd_compile.h)
 421 do_strip           = $(disp_strip)     $(cmd_strip)
 422 do_link            = $(disp_link)      $(cmd_link)
 423 do_link.so         = $(disp_link)      $(cmd_link.so)
 424 do_link.h          = $(disp_link.h)    $(cmd_link.h)
 425 do_ar              = $(disp_ar)        $(cmd_ar)
 426 do_elf2flt         = $(disp_elf2flt)   $(cmd_elf2flt)
 427
 428 uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
 429 %.a:
 430         @if test -z "$($(call uppercase,$*)_DIR)" ; then \
 431                 echo "Invalid target $@" ; \
 432                 exit 1 ; \
 433         fi
 434         $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
 435
 436 .PHONY: dummy