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            = $(CC) -E
  44 SED           ?= sed
  45 BZIP2         ?= bzip2
  46
  47
  48 # What OS are you compiling busybox for?  This allows you to include
  49 # OS specific things, syscall overrides, etc.
  50 TARGET_OS=linux
  51
  52 # Ensure consistent sort order, 'gcc -print-search-dirs' behavior, etc.
  53 LC_ALL:= C
  54
  55 # If you want to add some simple compiler switches (like -march=i686),
  56 # especially from the command line, use this instead of CFLAGS directly.
  57 # For optimization overrides, it's better still to set OPTIMIZATION.
  58 CFLAGS_EXTRA=$(subst ",, $(strip $(EXTRA_CFLAGS_OPTIONS)))
  59
  60 # To compile vs some other alternative libc, you may need to use/adjust
  61 # the following lines to meet your needs...
  62 #
  63 # If you are using Red Hat 6.x with the compatible RPMs (for developing under
  64 # Red Hat 5.x and glibc 2.0) uncomment the following.  Be sure to read about
  65 # using the compatible RPMs (compat-*) at http://www.redhat.com !
  66 #LIBCDIR:=/usr/i386-glibc20-linux
  67 #
  68 # For other libraries, you are on your own.  But these may (or may not) help...
  69 #LDFLAGS+=-nostdlib
  70 #LIBRARIES:=$(LIBCDIR)/lib/libc.a -lgcc
  71 #CROSS_CFLAGS+=-nostdinc -I$(LIBCDIR)/include -I$(GCCINCDIR) -funsigned-char
  72 #GCCINCDIR:=$(shell gcc -print-search-dirs | $(SED) -ne "s/install: \(.*\)/\1include/gp")
  73
  74 # This must bind late because srcdir is reset for every source subdirectory.
  75 INCS:=-I$(top_builddir)/include -I$(top_srcdir)/include
  76 CFLAGS=$(INCS) -I$(srcdir) -D_GNU_SOURCE
  77 CFLAGS+=$(CHECKED_CFLAGS)
  78 ARFLAGS=cru
  79
  80 # gcc centric. Perhaps fiddle with findstring gcc,$(CC) for the rest
  81 # get the CC MAJOR/MINOR version
  82 CC_MAJOR:=$(shell printf "%02d" $(shell echo __GNUC__ | $(CC) -E -xc - | tail -n 1))
  83 CC_MINOR:=$(shell printf "%02d" $(shell echo __GNUC_MINOR__ | $(CC) -E -xc - | tail -n 1))
  84
  85 #--------------------------------------------------------
  86 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
  87 ifeq ($(strip $(TARGET_ARCH)),)
  88 TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
  89                 -e 's/i.86/i386/' \
  90                 -e 's/sparc.*/sparc/' \
  91                 -e 's/arm.*/arm/g' \
  92                 -e 's/m68k.*/m68k/' \
  93                 -e 's/ppc/powerpc/g' \
  94                 -e 's/v850.*/v850/g' \
  95                 -e 's/sh[234]/sh/' \
  96                 -e 's/mips-.*/mips/' \
  97                 -e 's/mipsel-.*/mipsel/' \
  98                 -e 's/cris.*/cris/' \
  99                 )
 100 endif
 101
 102 # A nifty macro to make testing gcc features easier, but note that everything
 103 # that uses this _must_ use := or it will be re-evaluated everytime it is
 104 # referenced.
 105 ifeq ($(strip $(V)),2)
 106 VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
 107 endif
 108 check_cc=$(shell \
 109         $(VERBOSE_CHECK_CC) \
 110         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 111                 echo "int i;" > ./conftest.c; \
 112                 if $(1) $(2) -c -o conftest.o conftest.c > /dev/null 2>&1; \
 113                 then echo "$(2)"; else echo "$(3)"; fi ; \
 114                 rm -f conftest.c conftest.o; \
 115         fi)
 116
 117 # A not very robust macro to check for available ld flags
 118 ifeq ($(strip $(V)),2)
 119 VERBOSE_CHECK_LD=echo LD=\"$(1)\" check_ld $(2) >&2;
 120 endif
 121 check_ld=$(shell \
 122         $(VERBOSE_CHECK_LD) \
 123         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 124                 $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
 125                 echo "-Wl,$(2)" ; \
 126         fi)
 127
 128 # A not very robust macro to check for available strip flags
 129 ifeq ($(strip $(V)),2)
 130 VERBOSE_CHECK_STRIP=echo STRIPCMD=\"$(1)\" check_strip $(2) >&2;
 131 endif
 132 check_strip=$(shell \
 133         $(VERBOSE_CHECK_STRIP) \
 134         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 135                 echo "int i;" > ./conftest.c ; \
 136                 $(CC) -c -o conftest.o conftest.c > /dev/null 2>&1 ; \
 137                 $(1) $(2) conftest.o > /dev/null 2>&1 && \
 138                 echo "$(1) $(2)" || echo "$(3)"; \
 139                 rm -f conftest.c conftest.o > /dev/null 2>&1 ; \
 140         fi)
 141
 142
 143
 144 # Select the compiler needed to build binaries for your development system
 145 HOSTCC     = gcc
 146 HOSTCFLAGS:=$(call check_cc,$(HOSTCC),-Wall,)
 147 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-Wstrict-prototypes,)
 148 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-O2,)
 149 HOSTCFLAGS+=$(call check_cc,$(HOSTCC),-fomit-frame-pointer,)
 150
 151 LD_WHOLE_ARCHIVE:=$(shell echo "int i;" > conftest.c ; \
 152         $(CC) -c -o conftest.o conftest.c ; \
 153         echo "int main(void){return 0;}" > conftest_main.c ; \
 154         $(CC) -c -o conftest_main.o conftest_main.c ; \
 155         $(AR) $(ARFLAGS) conftest.a conftest.o ; \
 156         $(CC) -Wl,--whole-archive conftest.a -Wl,--no-whole-archive \
 157          conftest_main.o -o conftest > /dev/null 2>&1 \
 158          && echo "-Wl,--whole-archive" ; \
 159         rm conftest_main.o conftest_main.c conftest.o conftest.c \
 160          conftest.a conftest > /dev/null 2>&1 ; )
 161 ifneq ($(findstring whole-archive,$(LD_WHOLE_ARCHIVE)),)
 162 LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
 163 endif
 164
 165 LD_START_GROUP:=$(shell echo "int bar(void){return 0;}" > conftest.c ; \
 166         $(CC) -c -o conftest.o conftest.c ; \
 167         echo "int main(void){return bar();}" > conftest_main.c ; \
 168         $(CC) -c -o conftest_main.o conftest_main.c ; \
 169         $(AR) $(ARFLAGS) conftest.a conftest.o ; \
 170         $(CC) -Wl,--start-group conftest.a conftest_main.o -Wl,--end-group \
 171          -o conftest > /dev/null 2>&1 && echo "-Wl,--start-group" ; \
 172         echo rm conftest_main.o conftest_main.c conftest.o conftest.c \
 173          conftest.a conftest > /dev/null 2>&1 ; )
 174 ifneq ($(findstring start-group,$(LD_START_GROUP)),)
 175 LD_END_GROUP:= -Wl,--end-group
 176 endif
 177
 178 CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
 179
 180 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
 181 CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
 182 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 183 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 184 CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
 185 CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
 186 CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
 187
 188 # Preemptively pin this too.
 189 PROG_CFLAGS:=
 190
 191
 192 #--------------------------------------------------------
 193 # Arch specific compiler optimization stuff should go here.
 194 # Unless you want to override the defaults, do not set anything
 195 # for OPTIMIZATION...
 196
 197 # use '-Os' optimization if available, else use -O2
 198 OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
 199
 200 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
 201 # gcc 2.95 exits with 0 for "unrecognized option"
 202 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
 203         CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
 204 endif
 205 OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
 206 OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
 207 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 208 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 209 # This prevents us from using -fwhole-program when we build the lib
 210 PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
 211 endif # CONFIG_BUILD_LIBBUSYBOX
 212 endif # CONFIG_BUILD_AT_ONCE
 213
 214 LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
 215 #LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
 216 #LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
 217 #LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
 218
 219
 220 # Some nice architecture specific optimizations
 221 ifeq ($(strip $(TARGET_ARCH)),arm)
 222         OPTIMIZATION+=-fstrict-aliasing
 223 endif
 224 ifeq ($(strip $(TARGET_ARCH)),i386)
 225         OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
 226 # gcc-4.0 and older seem to benefit from these
 227 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 228         OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
 229         OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
 230                 -malign-functions=0 -malign-jumps=0 -malign-loops=0)
 231 #endif # gcc-4.0 and older
 232
 233 # gcc-4.1 and beyond seem to benefit from these
 234 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 235         # turn off flags which hurt -Os
 236         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
 237         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
 238         OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
 239
 240         OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
 241 endif # gcc-4.1 and beyond
 242 endif
 243 OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
 244
 245 #
 246 #--------------------------------------------------------
 247 # If you're going to do a lot of builds with a non-vanilla configuration,
 248 # it makes sense to adjust parameters above, so you can type "make"
 249 # by itself, instead of following it by the same half-dozen overrides
 250 # every time.  The stuff below, on the other hand, is probably less
 251 # prone to casual user adjustment.
 252 #
 253
 254 ifeq ($(strip $(CONFIG_LFS)),y)
 255     # For large file summit support
 256     CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 257 endif
 258 ifeq ($(strip $(CONFIG_DMALLOC)),y)
 259     # For testing mem leaks with dmalloc
 260     CFLAGS+=-DDMALLOC
 261     LIBRARIES:=-ldmalloc
 262 else
 263     ifeq ($(strip $(CONFIG_EFENCE)),y)
 264         LIBRARIES:=-lefence
 265     endif
 266 endif
 267
 268 # Debugging info
 269
 270 ifeq ($(strip $(CONFIG_DEBUG)),y)
 271     CFLAGS +=-g
 272 else
 273     CFLAGS +=-DNDEBUG
 274     CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 275 endif
 276
 277 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
 278     CFLAGS += $(OPTIMIZATION)
 279 endif
 280
 281 # warn a bit more verbosely for non-release versions
 282 ifneq ($(EXTRAVERSION),)
 283     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 284     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
 285     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
 286     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
 287     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
 288     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 289     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 290 endif
 291 STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 292 ifeq ($(strip $(CONFIG_STATIC)),y)
 293     PROG_CFLAGS += $(call check_cc,$(CC),-static,)
 294 endif
 295 CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
 296 LIB_CFLAGS+=$(CFLAGS_SHARED)
 297
 298 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
 299     CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
 300     LIB_CFLAGS+=$(CFLAGS_PIC)
 301 endif
 302
 303 ifeq ($(strip $(CONFIG_SELINUX)),y)
 304     LIBRARIES += -lselinux
 305 endif
 306
 307 ifeq ($(strip $(PREFIX)),)
 308     PREFIX:=`pwd`/_install
 309 endif
 310
 311 #ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
 312 #    CFLAGS += -D__need_getopt
 313 #endif
 314
 315 # Additional complications due to support for pristine source dir.
 316 # Include files in the build directory should take precedence over
 317 # the copy in top_srcdir, both during the compilation phase and the
 318 # shell script that finds the list of object files.
 319 # Work in progress by <ldoolitt@recycle.lbl.gov>.
 320
 321
 322 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 323 CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
 324 LDFLAGS += $(CHECKED_LDFLAGS)
 325
 326 ifdef BB_INIT_SCRIPT
 327     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 328 endif
 329
 330 # Put user-supplied flags at the end, where they
 331 # have a chance of winning.
 332 CFLAGS += $(CFLAGS_EXTRA)
 333
 334 #------------------------------------------------------------
 335 # Installation options
 336 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
 337 INSTALL_OPTS=--hardlinks
 338 endif
 339 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
 340 INSTALL_OPTS=--symlinks
 341 endif
 342 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
 343 INSTALL_OPTS=
 344 endif
 345
 346 #------------------------------------------------------------
 347 # Make the output nice and tight
 348 MAKEFLAGS += --no-print-directory
 349 export MAKE_IS_SILENT=n
 350 ifneq ($(findstring s,$(MAKEFLAGS)),)
 351 export MAKE_IS_SILENT=y
 352 SECHO := @-false
 353 DISP  := sil
 354 Q     := @
 355 else
 356 ifneq ($(V)$(VERBOSE),)
 357 SECHO := @-false
 358 DISP  := ver
 359 Q     :=
 360 else
 361 SECHO := @echo
 362 DISP  := pur
 363 Q     := @
 364 endif
 365 endif
 366
 367 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
 368 pur_disp_compile.c = echo "  "CC $(show_objs)
 369 pur_disp_compile.h = echo "  "HOSTCC $(show_objs)
 370 pur_disp_strip     = echo "  "STRIP $(show_objs)
 371 pur_disp_link      = echo "  "LINK $(show_objs)
 372 pur_disp_link.h    = echo "  "HOSTLINK $(show_objs)
 373 pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs)
 374 pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
 375 sil_disp_compile.c = true
 376 sil_disp_compile.h = true
 377 sil_disp_strip     = true
 378 sil_disp_link      = true
 379 sil_disp_link.h    = true
 380 sil_disp_ar        = true
 381 sil_disp_elf2flt   = true
 382 ver_disp_compile.c = echo $(cmd_compile.c)
 383 ver_disp_compile.h = echo $(cmd_compile.h)
 384 ver_disp_strip     = echo $(cmd_strip)
 385 ver_disp_link      = echo $(cmd_link)
 386 ver_disp_link.h    = echo $(cmd_link.h)
 387 ver_disp_ar        = echo $(cmd_ar)
 388 ver_disp_elf2flt   = echo $(cmd_elf2flt)
 389 disp_compile.c     = $($(DISP)_disp_compile.c)
 390 disp_compile.h     = $($(DISP)_disp_compile.h)
 391 disp_strip         = $($(DISP)_disp_strip)
 392 disp_link          = $($(DISP)_disp_link)
 393 disp_link.h        = $($(DISP)_disp_link.h)
 394 disp_ar            = $($(DISP)_disp_ar)
 395 disp_gen           = $(SECHO) "  "GEN $@ ; true
 396 disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
 397 disp_elf2flt       = $($(DISP)_disp_elf2flt)
 398 cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
 399 cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
 400 cmd_strip          = $(STRIPCMD) $@
 401 cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS)
 402 cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
 403 cmd_ar             = $(AR) $(ARFLAGS) $@ $^
 404 cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
 405 compile.c          = @$(disp_compile.c) ; $(cmd_compile.c)
 406 compile.h          = @$(disp_compile.h) ; $(cmd_compile.h)
 407 do_strip           = @$(disp_strip)     ; $(cmd_strip)
 408 do_link            = @$(disp_link)      ; $(cmd_link)
 409 do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
 410 do_ar              = @$(disp_ar)        ; $(cmd_ar)
 411 do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)
 412
 413 uppercase = $(shell echo $1 | tr '[:lower:]' '[:upper:]')
 414 %.a:
 415         @if test -z "$($(call uppercase,$*)_DIR)" ; then \
 416                 echo "Invalid target $@" ; \
 417                 exit 1 ; \
 418         fi
 419         $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
 420
 421 .PHONY: dummy