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 $(top_builddir)/.config
  11 endif
  12
  13 #--------------------------------------------------------
  14 PROG      := busybox
  15 MAJOR_VERSION   :=1
  16 MINOR_VERSION   :=2
  17 SUBLEVEL_VERSION:=0
  18 EXTRAVERSION    :=-pre0
  19 VERSION   :=$(MAJOR_VERSION).$(MINOR_VERSION).$(SUBLEVEL_VERSION)$(EXTRAVERSION)
  20 BUILDTIME := $(shell TZ=UTC date -u "+%Y.%m.%d-%H:%M%z")
  21
  22
  23 #--------------------------------------------------------
  24 # With a modern GNU make(1) (highly recommended, that's what all the
  25 # developers use), all of the following configuration values can be
  26 # overridden at the command line.  For example:
  27 #   make CROSS=powerpc-linux- top_srcdir="$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
  34 CROSS          =$(strip $(subst ",, $(strip $(CROSS_COMPILER_PREFIX))))
  35 # be gentle to vi coloring.. "))
  36 CC             = $(CROSS)gcc
  37 AR             = $(CROSS)ar
  38 AS             = $(CROSS)as
  39 LD             = $(CROSS)ld
  40 NM             = $(CROSS)nm
  41 STRIP          = $(CROSS)strip
  42 ELF2FLT        = $(CROSS)elf2flt
  43 CPP            = $(CC) -E
  44 SED           ?= sed
  45 BZIP2         ?= bzip2
  46
  47
  48 # What OS are you compiling busybox for?  This allows you to include
  49 # OS specific things, syscall overrides, etc.
  50 TARGET_OS=linux
  51
  52 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  53 LC_ALL:= C
  54
  55 # This must bind late because srcdir is reset for every source subdirectory.
  56 INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
  57 CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
  58 CFLAGS+=$(CHECKED_CFLAGS)
  59 ARFLAGS=cru
  60
  61 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
  62 # get the CC MAJOR/MINOR version
  63 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
  64 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
  65
  66 #--------------------------------------------------------
  67 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
  68 ifeq ($(strip $(TARGET_ARCH)),)
  69 TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
  70                 -e 's/i.86/i386/' \
  71                 -e 's/sparc.*/sparc/' \
  72                 -e 's/arm.*/arm/g' \
  73                 -e 's/m68k.*/m68k/' \
  74                 -e 's/ppc/powerpc/g' \
  75                 -e 's/v850.*/v850/g' \
  76                 -e 's/sh[234]/sh/' \
  77                 -e 's/mips-.*/mips/' \
  78                 -e 's/mipsel-.*/mipsel/' \
  79                 -e 's/cris.*/cris/' \
  80                 )
  81 endif
  82
  83 # A nifty macro to make testing gcc features easier, but note that everything
  84 # that uses this _must_ use := or it will be re-evaluated everytime it is
  85 # referenced.
  86 ifeq ($(strip $(BUILD_VERBOSE)),2)
  87 VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
  88 endif
  89 check_cc=$(shell \
  90         $(VERBOSE_CHECK_CC) \
  91         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
  92                 echo "int i;" > ./conftest.c; \
  93                 if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
  94                 then echo "$(2)"; else echo "$(3)"; fi ; \
  95                 rm -f conftest.c conftest.o; \
  96         fi)
  97
  98 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
  99 check_cc:=
 100 endif
 101
 102 # A not very robust macro to check for available ld flags
 103 ifeq ($(strip $(BUILD_VERBOSE)),2)
 104 VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
 105 endif
 106 check_ld=$(shell \
 107         $(VERBOSE_CHECK_LD) \
 108         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 109                 $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
 110                 echo "-Wl,$(2)" ; \
 111         fi)
 112
 113 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 114 check_ld:=
 115 endif
 116
 117 # A not very robust macro to check for available strip flags
 118 ifeq ($(strip $(BUILD_VERBOSE)),2)
 119 VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
 120 endif
 121 check_strip=$(shell \
 122         $(VERBOSE_CHECK_STRIP) \
 123         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 124                 echo "int i;" > ./conftest.c ; \
 125                 $(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
 126                 $(1) $(2) conftest.o > /dev/null 2>&1 && \
 127                 echo "$(1) $(2)" || echo "$(3)"; \
 128                 rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
 129         fi)
 130
 131 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 132 check_strip:=
 133 endif
 134
 135
 136 # Select the compiler needed to build binaries for your development system
 137 HOSTCC     = gcc
 138 HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
 139 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
 140 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
 141 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
 142
 143 LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
 144         $(CC) -c -o conftest.o conftest.c ; \
 145         echo "int main(void){return 0;}" > conftest_main.c ; \
 146         $(CC) -c -o conftest_main.o conftest_main.c ; \
 147         $(AR) $(ARFLAGS) conftest.a conftest.o ; \
 148         $(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
 149          conftest_main.o -o conftest > /dev/null 2>&1 \
 150          && echo "-Wl,--whole-archive" ; \
 151         rm conftest_main.o conftest_main.c conftest.o conftest.c \
 152          conftest.a conftest > /dev/null 2>&1 ; )
 153 ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
 154 LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
 155 endif
 156
 157 LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
 158         $(CC) -c -o conftest.o conftest.c ; \
 159         echo "int main(void){return bar();}" > conftest_main.c ; \
 160         $(CC) -c -o conftest_main.o conftest_main.c ; \
 161         $(AR) $(ARFLAGS) conftest.a conftest.o ; \
 162         $(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
 163          -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
 164         rm conftest_main.o conftest_main.c conftest.o conftest.c \
 165          conftest.a conftest > /dev/null 2>&1 ; )
 166 ifneq ($(findstring start-group,$(LD_START_GROUP)),)
 167 LD_END_GROUP:= -Wl,--end-group
 168 endif
 169
 170 CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
 171
 172 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
 173 CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
 174 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 175 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 176 CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
 177 CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
 178 CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
 179
 180 # Preemptively pin this too.
 181 PROG_CFLAGS:=
 182
 183
 184 #--------------------------------------------------------
 185 # Arch specific compiler optimization stuff should go here.
 186 # Unless you want to override the defaults, do not set anything
 187 # for OPTIMIZATION...
 188
 189 # use '-Os' optimization if available, else use -O2
 190 OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
 191
 192 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
 193 # gcc 2.95 exits with 0 for "unrecognized option"
 194 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
 195         CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
 196 endif
 197 OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
 198 OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
 199 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 200 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 201 # This prevents us from using -fwhole-program when we build the lib
 202 PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
 203 endif # CONFIG_BUILD_LIBBUSYBOX
 204 endif # CONFIG_BUILD_AT_ONCE
 205
 206 LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
 207 #LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
 208 #LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
 209 #LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
 210
 211
 212 # Some nice architecture specific optimizations
 213 ifeq ($(strip $(TARGET_ARCH)),arm)
 214         OPTIMIZATION+=-fstrict-aliasing
 215 endif
 216 ifeq ($(strip $(TARGET_ARCH)),i386)
 217         OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
 218 # gcc-4.0 and older seem to benefit from these
 219 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 220         OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
 221         OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
 222                 -malign-functions=0 -malign-jumps=0 -malign-loops=0)
 223 #endif # gcc-4.0 and older
 224
 225 # gcc-4.1 and beyond seem to benefit from these
 226 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 227         # turn off flags which hurt -Os
 228         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
 229         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
 230         OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
 231
 232         OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
 233 endif # gcc-4.1 and beyond
 234 endif
 235 OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
 236 OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)
 237
 238 #
 239 #--------------------------------------------------------
 240 # If you're going to do a lot of builds with a non-vanilla configuration,
 241 # it makes sense to adjust parameters above, so you can type "make"
 242 # by itself, instead of following it by the same half-dozen overrides
 243 # every time.  The stuff below, on the other hand, is probably less
 244 # prone to casual user adjustment.
 245 #
 246
 247 ifeq ($(strip $(CONFIG_LFS)),y)
 248     # For large file summit support
 249     CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 250 endif
 251 ifeq ($(strip $(CONFIG_DMALLOC)),y)
 252     # For testing mem leaks with dmalloc
 253     CFLAGS+=-DDMALLOC
 254     LIBRARIES:=-ldmalloc
 255 else
 256     ifeq ($(strip $(CONFIG_EFENCE)),y)
 257         LIBRARIES:=-lefence
 258     endif
 259 endif
 260
 261 # Debugging info
 262
 263 ifeq ($(strip $(CONFIG_DEBUG)),y)
 264     CFLAGS +=-g
 265 else
 266     CFLAGS +=-DNDEBUG
 267     CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 268     CHECKED_LDFLAGS += $(call check_ld,--gc-sections,)
 269 endif
 270
 271 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
 272     CFLAGS += $(OPTIMIZATION)
 273 endif
 274
 275 # warn a bit more verbosely for non-release versions
 276 ifneq ($(EXTRAVERSION),)
 277     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 278     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
 279     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
 280     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
 281     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
 282     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 283     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 284 endif
 285 STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 286 ifeq ($(strip $(CONFIG_STATIC)),y)
 287     PROG_CFLAGS += $(call check_cc,$(CC),-static,)
 288 endif
 289 CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
 290 LIB_CFLAGS+=$(CFLAGS_SHARED)
 291
 292 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
 293     CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
 294     LIB_CFLAGS+=$(CFLAGS_PIC)
 295 endif
 296
 297 ifeq ($(strip $(CONFIG_SELINUX)),y)
 298     LIBRARIES += -lselinux
 299 endif
 300
 301 ifeq ($(strip $(PREFIX)),)
 302     PREFIX:=`pwd`/_install
 303 endif
 304
 305 ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
 306     CFLAGS += -D__need_getopt
 307 endif
 308
 309 # Additional complications due to support for pristine source dir.
 310 # Include files in the build directory should take precedence over
 311 # the copy in top_srcdir, both during the compilation phase and the
 312 # shell script that finds the list of object files.
 313 # Work in progress by <ldoolitt@recycle.lbl.gov>.
 314
 315
 316 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 317 CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
 318 LDFLAGS += $(CHECKED_LDFLAGS)
 319
 320 ifdef BB_INIT_SCRIPT
 321     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 322 endif
 323
 324 # Put user-supplied flags at the end, where they
 325 # have a chance of winning.
 326 -include $(top_builddir)/.config.mak
 327
 328 #------------------------------------------------------------
 329 # Installation options
 330 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
 331 INSTALL_OPTS=--hardlinks
 332 endif
 333 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
 334 INSTALL_OPTS=--symlinks
 335 endif
 336 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
 337 INSTALL_OPTS=
 338 endif
 339
 340 #------------------------------------------------------------
 341 # Make the output nice and tight
 342 MAKEFLAGS += --no-print-directory
 343 export MAKE_IS_SILENT=n
 344 ifneq ($(findstring s,$(MAKEFLAGS)),)
 345 export MAKE_IS_SILENT=y
 346 SECHO := @-false
 347 DISP  := sil
 348 Q     := @
 349 else
 350 ifneq ($(BUILD_VERBOSE),)
 351 SECHO := @-false
 352 DISP  := ver
 353 Q     :=
 354 else
 355 SECHO := @echo
 356 DISP  := pur
 357 Q     := @
 358 endif
 359 endif
 360
 361 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
 362 pur_disp_compile.c = echo "  "CC $(show_objs)
 363 pur_disp_compile.h = echo "  "HOSTCC $(show_objs)
 364 pur_disp_strip     = echo "  "STRIP $(show_objs)
 365 pur_disp_link      = echo "  "LINK $(show_objs)
 366 pur_disp_link.h    = echo "  "HOSTLINK $(show_objs)
 367 pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs)
 368 pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
 369 sil_disp_compile.c = true
 370 sil_disp_compile.h = true
 371 sil_disp_strip     = true
 372 sil_disp_link      = true
 373 sil_disp_link.h    = true
 374 sil_disp_ar        = true
 375 sil_disp_elf2flt   = true
 376 ver_disp_compile.c = echo $(cmd_compile.c)
 377 ver_disp_compile.h = echo $(cmd_compile.h)
 378 ver_disp_strip     = echo $(cmd_strip)
 379 ver_disp_link      = echo $(cmd_link)
 380 ver_disp_link.h    = echo $(cmd_link.h)
 381 ver_disp_ar        = echo $(cmd_ar)
 382 ver_disp_elf2flt   = echo $(cmd_elf2flt)
 383 disp_compile.c     = $($(DISP)_disp_compile.c)
 384 disp_compile.h     = $($(DISP)_disp_compile.h)
 385 disp_strip         = $($(DISP)_disp_strip)
 386 disp_link          = $($(DISP)_disp_link)
 387 disp_link.h        = $($(DISP)_disp_link.h)
 388 disp_ar            = $($(DISP)_disp_ar)
 389 disp_gen           = $(SECHO) "  "GEN $@ ; true
 390 disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
 391 disp_elf2flt       = $($(DISP)_disp_elf2flt)
 392 cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
 393 cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
 394 cmd_strip          = $(STRIPCMD) $@
 395 cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 396                         $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
 397                         -o $@ $(LD_START_GROUP)  \
 398                         $(APPLETS_DEFINE) $(APPLET_SRC) \
 399                         $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
 400                         $(LDBUSYBOX) $(LIBRARIES) \
 401                         $(LD_END_GROUP)
 402 cmd_link.so        = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 403                         $(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
 404                         -o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
 405                         $(LIBRARY_DEFINE) $(^) \
 406                         $(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
 407 cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
 408 cmd_ar             = $(AR) $(ARFLAGS) $@ $^
 409 cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
 410 compile.c          = @$(disp_compile.c) ; $(cmd_compile.c)
 411 compile.h          = @$(disp_compile.h) ; $(cmd_compile.h)
 412 do_strip           = @$(disp_strip)     ; $(cmd_strip)
 413 do_link            = @$(disp_link)      ; $(cmd_link)
 414 do_link.so         = @$(disp_link)      ; $(cmd_link.so)
 415 do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
 416 do_ar              = @$(disp_ar)        ; $(cmd_ar)
 417 do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)
 418
 419 uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
 420 %.a:
 421         @if test -z "$($(call uppercase,$*)_DIR)" ; then \
 422                 echo "Invalid target $@" ; \
 423                 exit 1 ; \
 424         fi
 425         $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
 426
 427 .PHONY: dummy