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 $(top_builddir)/.config
  11 endif
  12
  13 #--------------------------------------------------------
  14 PROG      := busybox
  15 MAJOR_VERSION   :=1
  16 MINOR_VERSION   :=2
  17 SUBLEVEL_VERSION:=0
  18 EXTRAVERSION    :=
  19 VERSION   :=$(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
 170 # Pin CHECKED_CFLAGS with := so it's only evaluated once.
 171 CHECKED_CFLAGS:=$(call check_cc,$(CC),-Wall,)
 172 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 173 CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 174 CHECKED_CFLAGS+=$(call check_cc,$(CC),-funsigned-char,)
 175 CHECKED_CFLAGS+=$(call check_cc,$(CC),-mmax-stack-frame=256,)
 176 CHECKED_CFLAGS+=$(call check_cc,$(CC),-fno-builtin-strlen)
 177 CHECKED_CFLAGS+=$(call check_cc,$(CC),-finline-limit=0)
 178
 179 # Preemptively pin this too.
 180 PROG_CFLAGS:=
 181
 182
 183 #--------------------------------------------------------
 184 # Arch specific compiler optimization stuff should go here.
 185 # Unless you want to override the defaults, do not set anything
 186 # for OPTIMIZATION...
 187
 188 # use '-Os' optimization if available, else use -O2
 189 OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
 190
 191 ifeq ($(CONFIG_BUILD_AT_ONCE),y)
 192 # gcc 2.95 exits with 0 for "unrecognized option"
 193 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 3 ] ; echo $$?)),0)
 194         CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
 195 endif
 196 OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
 197 OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
 198 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 199 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 200 # This prevents us from using -fwhole-program when we build the lib
 201 PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
 202 endif # CONFIG_BUILD_LIBBUSYBOX
 203 endif # CONFIG_BUILD_AT_ONCE
 204
 205 LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
 206 #LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
 207 #LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
 208 #LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
 209
 210
 211 # Some nice architecture specific optimizations
 212 ifeq ($(strip $(TARGET_ARCH)),arm)
 213         OPTIMIZATION+=-fstrict-aliasing
 214 endif
 215 ifeq ($(strip $(TARGET_ARCH)),i386)
 216         OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
 217 # gcc-4.0 and older seem to benefit from these
 218 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 219         OPTIMIZATION+=$(call check_cc,$(CC),-mpreferred-stack-boundary=2,)
 220         OPTIMIZATION+=$(call check_cc,$(CC),-falign-functions=1 -falign-jumps=1 -falign-loops=1,\
 221                 -malign-functions=0 -malign-jumps=0 -malign-loops=0)
 222 #endif # gcc-4.0 and older
 223
 224 # gcc-4.1 and beyond seem to benefit from these
 225 ifeq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),0)
 226         # turn off flags which hurt -Os
 227         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-loop-optimize,)
 228         OPTIMIZATION+=$(call check_cc,$(CC),-fno-tree-dominator-opts,)
 229         OPTIMIZATION+=$(call check_cc,$(CC),-fno-strength-reduce,)
 230
 231         OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
 232 endif # gcc-4.1 and beyond
 233 endif
 234 OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
 235 OPTIMIZATION+=$(call check_cc,$(CC),-ffunction-sections -fdata-sections,)
 236
 237 #
 238 #--------------------------------------------------------
 239 # If you're going to do a lot of builds with a non-vanilla configuration,
 240 # it makes sense to adjust parameters above, so you can type "make"
 241 # by itself, instead of following it by the same half-dozen overrides
 242 # every time.  The stuff below, on the other hand, is probably less
 243 # prone to casual user adjustment.
 244 #
 245
 246 ifeq ($(strip $(CONFIG_LFS)),y)
 247     # For large file summit support
 248     CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 249 endif
 250 ifeq ($(strip $(CONFIG_DMALLOC)),y)
 251     # For testing mem leaks with dmalloc
 252     CFLAGS+=-DDMALLOC
 253     LIBRARIES:=-ldmalloc
 254 else
 255     ifeq ($(strip $(CONFIG_EFENCE)),y)
 256         LIBRARIES:=-lefence
 257     endif
 258 endif
 259
 260 # Debugging info
 261
 262 ifeq ($(strip $(CONFIG_DEBUG)),y)
 263     CFLAGS +=-g
 264 else
 265     CFLAGS +=-DNDEBUG
 266     CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 267     CHECKED_LDFLAGS += $(call check_ld,--gc-sections,)
 268 endif
 269
 270 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
 271     CFLAGS += $(OPTIMIZATION)
 272 endif
 273
 274 # warn a bit more verbosely for non-release versions
 275 ifneq ($(EXTRAVERSION),)
 276     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 277     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
 278     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
 279     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
 280     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
 281     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 282     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 283 endif
 284 STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 285 ifeq ($(strip $(CONFIG_STATIC)),y)
 286     PROG_CFLAGS += $(call check_cc,$(CC),-static,)
 287 endif
 288 CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
 289 LIB_CFLAGS+=$(CFLAGS_SHARED)
 290
 291 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
 292     CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
 293     LIB_CFLAGS+=$(CFLAGS_PIC)
 294 endif
 295
 296 ifeq ($(strip $(CONFIG_SELINUX)),y)
 297     LIBRARIES += -lselinux
 298 endif
 299
 300 ifeq ($(strip $(PREFIX)),)
 301     PREFIX:=`pwd`/_install
 302 endif
 303
 304 ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
 305     CFLAGS += -D__need_getopt
 306 endif
 307
 308 # Additional complications due to support for pristine source dir.
 309 # Include files in the build directory should take precedence over
 310 # the copy in top_srcdir, both during the compilation phase and the
 311 # shell script that finds the list of object files.
 312 # Work in progress by <ldoolitt@recycle.lbl.gov>.
 313
 314
 315 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 316 CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
 317 LDFLAGS += $(CHECKED_LDFLAGS)
 318
 319 ifdef BB_INIT_SCRIPT
 320     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 321 endif
 322
 323 # Put user-supplied flags at the end, where they
 324 # have a chance of winning.
 325 -include $(top_builddir)/.config.mak
 326
 327 #------------------------------------------------------------
 328 # Installation options
 329 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
 330 INSTALL_OPTS=--hardlinks
 331 endif
 332 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
 333 INSTALL_OPTS=--symlinks
 334 endif
 335 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
 336 INSTALL_OPTS=
 337 endif
 338
 339 #------------------------------------------------------------
 340 # Make the output nice and tight
 341 MAKEFLAGS += --no-print-directory
 342 export MAKE_IS_SILENT=n
 343 ifneq ($(findstring s,$(MAKEFLAGS)),)
 344 export MAKE_IS_SILENT=y
 345 SECHO := @-false
 346 DISP  := sil
 347 Q     := @
 348 else
 349 ifneq ($(BUILD_VERBOSE),)
 350 SECHO := @-false
 351 DISP  := ver
 352 Q     :=
 353 else
 354 SECHO := @echo
 355 DISP  := pur
 356 Q     := @
 357 endif
 358 endif
 359
 360 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
 361 pur_disp_compile.c = echo "  "CC $(show_objs)
 362 pur_disp_compile.h = echo "  "HOSTCC $(show_objs)
 363 pur_disp_strip     = echo "  "STRIP $(show_objs)
 364 pur_disp_link      = echo "  "LINK $(show_objs)
 365 pur_disp_link.h    = echo "  "HOSTLINK $(show_objs)
 366 pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs)
 367 pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
 368 sil_disp_compile.c = true
 369 sil_disp_compile.h = true
 370 sil_disp_strip     = true
 371 sil_disp_link      = true
 372 sil_disp_link.h    = true
 373 sil_disp_ar        = true
 374 sil_disp_elf2flt   = true
 375 ver_disp_compile.c = echo $(cmd_compile.c)
 376 ver_disp_compile.h = echo $(cmd_compile.h)
 377 ver_disp_strip     = echo $(cmd_strip)
 378 ver_disp_link      = echo $(cmd_link)
 379 ver_disp_link.h    = echo $(cmd_link.h)
 380 ver_disp_ar        = echo $(cmd_ar)
 381 ver_disp_elf2flt   = echo $(cmd_elf2flt)
 382 disp_compile.c     = $($(DISP)_disp_compile.c)
 383 disp_compile.h     = $($(DISP)_disp_compile.h)
 384 disp_strip         = $($(DISP)_disp_strip)
 385 disp_link          = $($(DISP)_disp_link)
 386 disp_link.h        = $($(DISP)_disp_link.h)
 387 disp_ar            = $($(DISP)_disp_ar)
 388 disp_gen           = $(SECHO) "  "GEN $@ ; true
 389 disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
 390 disp_elf2flt       = $($(DISP)_disp_elf2flt)
 391 cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
 392 cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
 393 cmd_strip          = $(STRIPCMD) $@
 394 cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 395                         $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
 396                         -o $@ $(LD_START_GROUP)  \
 397                         $(APPLETS_DEFINE) $(APPLET_SRC) \
 398                         $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
 399                         $(LDBUSYBOX) $(LIBRARIES) \
 400                         $(LD_END_GROUP)
 401 cmd_link.so        = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 402                         $(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
 403                         -o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
 404                         $(LIBRARY_DEFINE) $(^) \
 405                         $(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
 406 cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
 407 cmd_ar             = $(AR) $(ARFLAGS) $@ $^
 408 cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
 409 compile.c          = @$(disp_compile.c) ; $(cmd_compile.c)
 410 compile.h          = @$(disp_compile.h) ; $(cmd_compile.h)
 411 do_strip           = @$(disp_strip)     ; $(cmd_strip)
 412 do_link            = @$(disp_link)      ; $(cmd_link)
 413 do_link.so         = @$(disp_link)      ; $(cmd_link.so)
 414 do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
 415 do_ar              = @$(disp_ar)        ; $(cmd_ar)
 416 do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)
 417
 418 uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
 419 %.a:
 420         @if test -z "$($(call uppercase,$*)_DIR)" ; then \
 421                 echo "Invalid target $@" ; \
 422                 exit 1 ; \
 423         fi
 424         $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
 425
 426 .PHONY: dummy