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 $(EXTRA_CFLAGS_OPTIONS)))
  59 # be gentle to vi coloring.. ")
  60
  61 # To compile vs some other alternative libc, you may need to use/adjust
  62 # the following lines to meet your needs...
  63 #
  64 # If you are using Red Hat 6.x with the compatible RPMs (for developing under
  65 # Red Hat 5.x and glibc 2.0) uncomment the following.  Be sure to read about
  66 # using the compatible RPMs (compat-*) at http://www.redhat.com !
  67 #LIBCDIR:=/usr/i386-glibc20-linux
  68 #
  69 # For other libraries, you are on your own.  But these may (or may not) help...
  70 #LDFLAGS+=-nostdlib
  71 #LIBRARIES:=$(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")
  74
  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+=$(CHECKED_CFLAGS)
  79 ARFLAGS=cru
  80
  81 # gcc centric. Perhaps fiddle with findstring gcc,$(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__ | $(CC) -E -xc - | tail -n 1))
  85
  86 #--------------------------------------------------------
  87 export VERSION BUILDTIME HOSTCC HOSTCFLAGS CROSS CC AR AS LD NM STRIP CPP
  88 ifeq ($(strip $(TARGET_ARCH)),)
  89 TARGET_ARCH:=$(shell $(CC) -dumpmachine | $(SED) -e s'/-.*//' \
  90                 -e 's/i.86/i386/' \
  91                 -e 's/sparc.*/sparc/' \
  92                 -e 's/arm.*/arm/g' \
  93                 -e 's/m68k.*/m68k/' \
  94                 -e 's/ppc/powerpc/g' \
  95                 -e 's/v850.*/v850/g' \
  96                 -e 's/sh[234]/sh/' \
  97                 -e 's/mips-.*/mips/' \
  98                 -e 's/mipsel-.*/mipsel/' \
  99                 -e 's/cris.*/cris/' \
 100                 )
 101 endif
 102
 103 # A nifty macro to make testing gcc features easier, but note that everything
 104 # that uses this _must_ use := or it will be re-evaluated everytime it is
 105 # referenced.
 106 ifeq ($(strip $(BUILD_VERBOSE)),2)
 107 VERBOSE_CHECK_CC=echo CC=\"$(1)\" check_cc $(2) >&2;
 108 endif
 109 check_cc=$(shell \
 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 "$(3)"; fi ; \
 115                 rm -f conftest.c conftest.o; \
 116         fi)
 117
 118 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 119 check_cc:=
 120 endif
 121
 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 $(2) >&2;
 125 endif
 126 check_ld=$(shell \
 127         $(VERBOSE_CHECK_LD) \
 128         if [ "x$(1)" != "x" ] && [ "x$(2)" != "x" ]; then \
 129                 $(1) -o /dev/null -b binary /dev/null > /dev/null 2>&1 && \
 130                 echo "-Wl,$(2)" ; \
 131         fi)
 132
 133 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 134 check_ld:=
 135 endif
 136
 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 $(2) >&2;
 140 endif
 141 check_strip=$(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 ; \
 149         fi)
 150
 151 ifneq ($(filter $(nocheck_targets),$(MAKECMDGOALS)),)
 152 check_strip:=
 153 endif
 154
 155
 156 # Select the compiler needed to build binaries for your development system
 157 HOSTCC     = gcc
 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,)
 162
 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,$(LD_WHOLE_ARCHIVE)),)
 174 LD_NO_WHOLE_ARCHIVE:= -Wl,--no-whole-archive
 175 endif
 176
 177 LD_START_GROUP:=$(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
 188 endif
 189
 190 CHECKED_LDFLAGS := $(call check_ld,$(LD),--warn-common,)
 191
 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)
 199
 200 # Preemptively pin this too.
 201 PROG_CFLAGS:=
 202
 203
 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...
 208
 209 # use '-Os' optimization if available, else use -O2
 210 OPTIMIZATION:=$(call check_cc,$(CC),-Os,-O2)
 211
 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 $$?)),0)
 215         CFLAGS_COMBINE:=$(call check_cc,$(CC),--combine,)
 216 endif
 217 OPTIMIZATION+=$(call check_cc,$(CC),-funit-at-a-time,)
 218 OPTIMIZATION+=$(call check_cc,$(CC),-fgcse-after-reload,)
 219 ifneq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 220 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25795
 221 # This prevents us from using -fwhole-program when we build the lib
 222 PROG_CFLAGS+=$(call check_cc,$(CC),-fwhole-program,)
 223 endif # CONFIG_BUILD_LIBBUSYBOX
 224 endif # CONFIG_BUILD_AT_ONCE
 225
 226 LIB_LDFLAGS:=$(call check_ld,$(LD),--enable-new-dtags,)
 227 #LIB_LDFLAGS+=$(call check_ld,$(LD),--reduce-memory-overheads,)
 228 #LIB_LDFLAGS+=$(call check_ld,$(LD),--as-needed,)
 229 #LIB_LDFLAGS+=$(call check_ld,$(LD),--warn-shared-textrel,)
 230
 231
 232 # Some nice architecture specific optimizations
 233 ifeq ($(strip $(TARGET_ARCH)),arm)
 234         OPTIMIZATION+=-fstrict-aliasing
 235 endif
 236 ifeq ($(strip $(TARGET_ARCH)),i386)
 237         OPTIMIZATION+=$(call check_cc,$(CC),-march=i386,)
 238 # gcc-4.0 and older seem to benefit from these
 239 #ifneq ($(strip $(shell [ $(CC_MAJOR) -ge 4 -a $(CC_MINOR) -ge 1 ] ; echo $$?)),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
 244
 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,)
 251
 252         OPTIMIZATION+=$(call check_cc,$(CC),-fno-branch-count-reg,)
 253 endif # gcc-4.1 and beyond
 254 endif
 255 OPTIMIZATION+=$(call check_cc,$(CC),-fomit-frame-pointer,)
 256
 257 #
 258 #--------------------------------------------------------
 259 # If you're going to do a lot of builds with a non-vanilla configuration,
 260 # it makes sense to adjust parameters above, so you can type "make"
 261 # by itself, instead of following it by the same half-dozen overrides
 262 # every time.  The stuff below, on the other hand, is probably less
 263 # prone to casual user adjustment.
 264 #
 265
 266 ifeq ($(strip $(CONFIG_LFS)),y)
 267     # For large file summit support
 268     CFLAGS+=-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 269 endif
 270 ifeq ($(strip $(CONFIG_DMALLOC)),y)
 271     # For testing mem leaks with dmalloc
 272     CFLAGS+=-DDMALLOC
 273     LIBRARIES:=-ldmalloc
 274 else
 275     ifeq ($(strip $(CONFIG_EFENCE)),y)
 276         LIBRARIES:=-lefence
 277     endif
 278 endif
 279
 280 # Debugging info
 281
 282 ifeq ($(strip $(CONFIG_DEBUG)),y)
 283     CFLAGS +=-g
 284 else
 285     CFLAGS +=-DNDEBUG
 286     CHECKED_LDFLAGS += $(call check_ld,$(LD),--sort-common,)
 287 endif
 288
 289 ifneq ($(strip $(CONFIG_DEBUG_PESSIMIZE)),y)
 290     CFLAGS += $(OPTIMIZATION)
 291 endif
 292
 293 # warn a bit more verbosely for non-release versions
 294 ifneq ($(EXTRAVERSION),)
 295     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wstrict-prototypes,)
 296     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-prototypes,)
 297     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wmissing-declarations,)
 298     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wunused,)
 299     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Winit-self,)
 300     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wshadow,)
 301     CHECKED_CFLAGS+=$(call check_cc,$(CC),-Wcast-align,)
 302 endif
 303 STRIPCMD:=$(call check_strip,$(STRIP),-s --remove-section=.note --remove-section=.comment,$(STRIP))
 304 ifeq ($(strip $(CONFIG_STATIC)),y)
 305     PROG_CFLAGS += $(call check_cc,$(CC),-static,)
 306 endif
 307 CFLAGS_SHARED := $(call check_cc,$(CC),-shared,)
 308 LIB_CFLAGS+=$(CFLAGS_SHARED)
 309
 310 ifeq ($(strip $(CONFIG_BUILD_LIBBUSYBOX)),y)
 311     CFLAGS_PIC:= $(call check_cc,$(CC),-fPIC,)
 312     LIB_CFLAGS+=$(CFLAGS_PIC)
 313 endif
 314
 315 ifeq ($(strip $(CONFIG_SELINUX)),y)
 316     LIBRARIES += -lselinux
 317 endif
 318
 319 ifeq ($(strip $(PREFIX)),)
 320     PREFIX:=`pwd`/_install
 321 endif
 322
 323 ifneq ($(strip $(CONFIG_GETOPT_LONG)),y)
 324     CFLAGS += -D__need_getopt
 325 endif
 326
 327 # Additional complications due to support for pristine source dir.
 328 # Include files in the build directory should take precedence over
 329 # the copy in top_srcdir, both during the compilation phase and the
 330 # shell script that finds the list of object files.
 331 # Work in progress by <ldoolitt@recycle.lbl.gov>.
 332
 333
 334 OBJECTS:=$(APPLET_SOURCES:.c=.o) busybox.o usage.o applets.o
 335 CFLAGS  += $(CHECKED_CFLAGS) $(CROSS_CFLAGS)
 336 LDFLAGS += $(CHECKED_LDFLAGS)
 337
 338 ifdef BB_INIT_SCRIPT
 339     CFLAGS += -DINIT_SCRIPT='"$(BB_INIT_SCRIPT)"'
 340 endif
 341
 342 # Put user-supplied flags at the end, where they
 343 # have a chance of winning.
 344 CFLAGS += $(CFLAGS_EXTRA)
 345
 346 #------------------------------------------------------------
 347 # Installation options
 348 ifeq ($(strip $(CONFIG_INSTALL_APPLET_HARDLINKS)),y)
 349 INSTALL_OPTS=--hardlinks
 350 endif
 351 ifeq ($(strip $(CONFIG_INSTALL_APPLET_SYMLINKS)),y)
 352 INSTALL_OPTS=--symlinks
 353 endif
 354 ifeq ($(strip $(CONFIG_INSTALL_APPLET_DONT)),y)
 355 INSTALL_OPTS=
 356 endif
 357
 358 #------------------------------------------------------------
 359 # Make the output nice and tight
 360 MAKEFLAGS += --no-print-directory
 361 export MAKE_IS_SILENT=n
 362 ifneq ($(findstring s,$(MAKEFLAGS)),)
 363 export MAKE_IS_SILENT=y
 364 SECHO := @-false
 365 DISP  := sil
 366 Q     := @
 367 else
 368 ifneq ($(BUILD_VERBOSE),)
 369 SECHO := @-false
 370 DISP  := ver
 371 Q     :=
 372 else
 373 SECHO := @echo
 374 DISP  := pur
 375 Q     := @
 376 endif
 377 endif
 378
 379 show_objs = $(subst $(top_builddir)/,,$(subst ../,,$@))
 380 pur_disp_compile.c = echo "  "CC $(show_objs)
 381 pur_disp_compile.h = echo "  "HOSTCC $(show_objs)
 382 pur_disp_strip     = echo "  "STRIP $(show_objs)
 383 pur_disp_link      = echo "  "LINK $(show_objs)
 384 pur_disp_link.h    = echo "  "HOSTLINK $(show_objs)
 385 pur_disp_ar        = echo "  "AR $(ARFLAGS) $(show_objs)
 386 pur_disp_elf2flt   = echo "  "ELF2FLT $(ELF2FLTFLAGS) $(show_objs)
 387 sil_disp_compile.c = true
 388 sil_disp_compile.h = true
 389 sil_disp_strip     = true
 390 sil_disp_link      = true
 391 sil_disp_link.h    = true
 392 sil_disp_ar        = true
 393 sil_disp_elf2flt   = true
 394 ver_disp_compile.c = echo $(cmd_compile.c)
 395 ver_disp_compile.h = echo $(cmd_compile.h)
 396 ver_disp_strip     = echo $(cmd_strip)
 397 ver_disp_link      = echo $(cmd_link)
 398 ver_disp_link.h    = echo $(cmd_link.h)
 399 ver_disp_ar        = echo $(cmd_ar)
 400 ver_disp_elf2flt   = echo $(cmd_elf2flt)
 401 disp_compile.c     = $($(DISP)_disp_compile.c)
 402 disp_compile.h     = $($(DISP)_disp_compile.h)
 403 disp_strip         = $($(DISP)_disp_strip)
 404 disp_link          = $($(DISP)_disp_link)
 405 disp_link.h        = $($(DISP)_disp_link.h)
 406 disp_ar            = $($(DISP)_disp_ar)
 407 disp_gen           = $(SECHO) "  "GEN $@ ; true
 408 disp_doc           = $(SECHO) "  "DOC $(subst docs/,,$@) ; true
 409 disp_elf2flt       = $($(DISP)_disp_elf2flt)
 410 cmd_compile.c      = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
 411 cmd_compile.h      = $(HOSTCC) $(HOSTCFLAGS) $(INCS) -c -o $@ $<
 412 cmd_strip          = $(STRIPCMD) $@
 413 cmd_link           = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 414                         $(PROG_CFLAGS) $(PROG_LDFLAGS) $(CFLAGS_COMBINE) \
 415                         -o $@ $(LD_START_GROUP)  \
 416                         $(APPLETS_DEFINE) $(APPLET_SRC) \
 417                         $(BUSYBOX_DEFINE) $(BUSYBOX_SRC) $(libraries-y) \
 418                         $(LDBUSYBOX) $(LIBRARIES) \
 419                         $(LD_END_GROUP)
 420 cmd_link.so        = $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(LDFLAGS) \
 421                         $(LIB_CFLAGS) $(CFLAGS_COMBINE) $(LIB_LDFLAGS) \
 422                         -o $(@) $(LD_START_GROUP) $(LD_WHOLE_ARCHIVE) \
 423                         $(LIBRARY_DEFINE) $(^) \
 424                         $(LD_NO_WHOLE_ARCHIVE) $(LD_END_GROUP)
 425 cmd_link.h         = $(HOSTCC) $(HOSTCFLAGS) $(INCS) $< -o $@
 426 cmd_ar             = $(AR) $(ARFLAGS) $@ $^
 427 cmd_elf2flt        = $(ELF2FLT) $(ELF2FLTFLAGS) $< -o $@
 428 compile.c          = @$(disp_compile.c) ; $(cmd_compile.c)
 429 compile.h          = @$(disp_compile.h) ; $(cmd_compile.h)
 430 do_strip           = @$(disp_strip)     ; $(cmd_strip)
 431 do_link            = @$(disp_link)      ; $(cmd_link)
 432 do_link.so         = @$(disp_link)      ; $(cmd_link.so)
 433 do_link.h          = @$(disp_link.h)    ; $(cmd_link.h)
 434 do_ar              = @$(disp_ar)        ; $(cmd_ar)
 435 do_elf2flt         = @$(disp_elf2flt)   ; $(cmd_elf2flt)
 436
 437 uppercase = $(shell echo $1 | $(SED) -e "y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/")
 438 %.a:
 439         @if test -z "$($(call uppercase,$*)_DIR)" ; then \
 440                 echo "Invalid target $@" ; \
 441                 exit 1 ; \
 442         fi
 443         $(Q)$(MAKE) $($(call uppercase,$*)_DIR)$@
 444
 445 .PHONY: dummy