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1 #
2 # (C) Copyright 2000-2013
3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 #
5 # SPDX-License-Identifier: GPL-2.0+
6 #
7
8 VERSION = 2014
9 PATCHLEVEL = 01
10 SUBLEVEL =
11 EXTRAVERSION =
12 ifneq "$(SUBLEVEL)" ""
13 U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
14 else
15 U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL)$(EXTRAVERSION)
16 endif
17 TIMESTAMP_FILE = include/generated/timestamp_autogenerated.h
18 VERSION_FILE = include/generated/version_autogenerated.h
19
20 HOSTARCH := $(shell uname -m | \
21 sed -e s/i.86/x86/ \
22 -e s/sun4u/sparc64/ \
23 -e s/arm.*/arm/ \
24 -e s/sa110/arm/ \
25 -e s/ppc64/powerpc/ \
26 -e s/ppc/powerpc/ \
27 -e s/macppc/powerpc/\
28 -e s/sh.*/sh/)
29
30 HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
31 sed -e 's/\(cygwin\).*/cygwin/')
32
33 export HOSTARCH HOSTOS
34
35 # Deal with colliding definitions from tcsh etc.
36 VENDOR=
37
38 #########################################################################
39 # Allow for silent builds
40 ifeq (,$(findstring s,$(MAKEFLAGS)))
41 XECHO = echo
42 else
43 XECHO = :
44 endif
45
46 # kbuild supports saving output files in a separate directory.
47 # To locate output files in a separate directory two syntaxes are supported.
48 # In both cases the working directory must be the root of the kernel src.
49 # 1) O=
50 # Use "make O=dir/to/store/output/files/"
51 #
52 # 2) Set KBUILD_OUTPUT
53 # Set the environment variable KBUILD_OUTPUT to point to the directory
54 # where the output files shall be placed.
55 # export KBUILD_OUTPUT=dir/to/store/output/files/
56 # make
57 #
58 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
59 # variable.
60
61
62 # KBUILD_SRC is set on invocation of make in OBJ directory
63 # KBUILD_SRC is not intended to be used by the regular user (for now)
64 ifeq ($(KBUILD_SRC),)
65
66 # OK, Make called in directory where kernel src resides
67 # Do we want to locate output files in a separate directory?
68 ifeq ("$(origin O)", "command line")
69 KBUILD_OUTPUT := $(O)
70 endif
71
72 ifeq ("$(origin W)", "command line")
73 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
74 endif
75
76 # That's our default target when none is given on the command line
77 PHONY := _all
78 _all:
79
80 # Cancel implicit rules on top Makefile
81 $(CURDIR)/Makefile Makefile: ;
82
83 ifneq ($(KBUILD_OUTPUT),)
84 # Invoke a second make in the output directory, passing relevant variables
85 # check that the output directory actually exists
86 saved-output := $(KBUILD_OUTPUT)
87 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
88 $(if $(KBUILD_OUTPUT),, \
89 $(error output directory "$(saved-output)" does not exist))
90
91 PHONY += $(MAKECMDGOALS) sub-make
92
93 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
94 @:
95
96 sub-make: FORCE
97 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
98 KBUILD_SRC=$(CURDIR) \
99 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
100 $(filter-out _all sub-make,$(MAKECMDGOALS))
101
102 # Leave processing to above invocation of make
103 skip-makefile := 1
104 endif # ifneq ($(KBUILD_OUTPUT),)
105 endif # ifeq ($(KBUILD_SRC),)
106
107 # We process the rest of the Makefile if this is the final invocation of make
108 ifeq ($(skip-makefile),)
109
110 PHONY += all
111 _all: all
112
113 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
114 objtree := $(CURDIR)
115 src := $(srctree)
116 obj := $(objtree)
117
118 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
119
120 export srctree objtree VPATH
121
122 # Call a source code checker (by default, "sparse") as part of the
123 # C compilation.
124 #
125 # Use 'make C=1' to enable checking of re-compiled files.
126 #
127 # See the linux kernel file "Documentation/sparse.txt" for more details,
128 # including where to get the "sparse" utility.
129
130 ifdef C
131 ifeq ("$(origin C)", "command line")
132 CHECKSRC := $(C)
133 endif
134 endif
135 ifndef CHECKSRC
136 CHECKSRC = 0
137 endif
138 export CHECKSRC
139
140 OBJTREE := $(objtree)
141 SPLTREE := $(OBJTREE)/spl
142 TPLTREE := $(OBJTREE)/tpl
143 SRCTREE := $(srctree)
144 TOPDIR := $(SRCTREE)
145 export TOPDIR SRCTREE OBJTREE SPLTREE TPLTREE
146
147 MKCONFIG := $(SRCTREE)/mkconfig
148 export MKCONFIG
149
150 # Make sure CDPATH settings don't interfere
151 unexport CDPATH
152
153 #########################################################################
154
155 # The "tools" are needed early, so put this first
156 # Don't include stuff already done in $(LIBS)
157 # The "examples" conditionally depend on U-Boot (say, when USE_PRIVATE_LIBGCC
158 # is "yes"), so compile examples after U-Boot is compiled.
159 SUBDIR_TOOLS = tools
160 SUBDIRS = $(SUBDIR_TOOLS)
161
162 .PHONY : $(SUBDIRS) $(VERSION_FILE) $(TIMESTAMP_FILE)
163
164 ifeq (include/config.mk,$(wildcard include/config.mk))
165
166 # Include autoconf.mk before config.mk so that the config options are available
167 # to all top level build files. We need the dummy all: target to prevent the
168 # dependency target in autoconf.mk.dep from being the default.
169 all:
170 sinclude include/autoconf.mk.dep
171 sinclude include/autoconf.mk
172
173 SUBDIR_EXAMPLES-y := examples/standalone
174 SUBDIR_EXAMPLES-$(CONFIG_API) += examples/api
175 ifndef CONFIG_SANDBOX
176 SUBDIRS += $(SUBDIR_EXAMPLES-y)
177 endif
178
179 # load ARCH, BOARD, and CPU configuration
180 include include/config.mk
181 export ARCH CPU BOARD VENDOR SOC
182
183 # set default to nothing for native builds
184 ifeq ($(HOSTARCH),$(ARCH))
185 CROSS_COMPILE ?=
186 endif
187
188 # SHELL used by kbuild
189 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
190 else if [ -x /bin/bash ]; then echo /bin/bash; \
191 else echo sh; fi ; fi)
192
193 HOSTCC = gcc
194 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
195
196 ifeq ($(HOSTOS),cygwin)
197 HOSTCFLAGS += -ansi
198 endif
199
200 # Mac OS X / Darwin's C preprocessor is Apple specific. It
201 # generates numerous errors and warnings. We want to bypass it
202 # and use GNU C's cpp. To do this we pass the -traditional-cpp
203 # option to the compiler. Note that the -traditional-cpp flag
204 # DOES NOT have the same semantics as GNU C's flag, all it does
205 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
206 #
207 # Apple's linker is similar, thanks to the new 2 stage linking
208 # multiple symbol definitions are treated as errors, hence the
209 # -multiply_defined suppress option to turn off this error.
210 #
211 ifeq ($(HOSTOS),darwin)
212 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
213 DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.')
214 DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.')
215
216 os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
217 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
218
219 # Snow Leopards build environment has no longer restrictions as described above
220 HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc")
221 HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
222 HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
223 endif
224
225 # Look for make include files relative to root of kernel src
226 MAKEFLAGS += --include-dir=$(srctree)
227
228 # We need some generic definitions (do not try to remake the file).
229 $(srctree)/scripts/Kbuild.include: ;
230 include $(srctree)/scripts/Kbuild.include
231
232 # Make variables (CC, etc...)
233
234 AS = $(CROSS_COMPILE)as
235 # Always use GNU ld
236 ifneq ($(shell $(CROSS_COMPILE)ld.bfd -v 2> /dev/null),)
237 LD = $(CROSS_COMPILE)ld.bfd
238 else
239 LD = $(CROSS_COMPILE)ld
240 endif
241 CC = $(CROSS_COMPILE)gcc
242 CPP = $(CC) -E
243 AR = $(CROSS_COMPILE)ar
244 NM = $(CROSS_COMPILE)nm
245 LDR = $(CROSS_COMPILE)ldr
246 STRIP = $(CROSS_COMPILE)strip
247 OBJCOPY = $(CROSS_COMPILE)objcopy
248 OBJDUMP = $(CROSS_COMPILE)objdump
249 AWK = awk
250 RANLIB = $(CROSS_COMPILE)RANLIB
251 DTC = dtc
252 CHECK = sparse
253
254 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
255 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
256
257 # Use UBOOTINCLUDE when you must reference the include/ directory.
258 # Needed to be compatible with the O= option
259 UBOOTINCLUDE :=
260 ifneq ($(OBJTREE),$(SRCTREE))
261 UBOOTINCLUDE += -I$(OBJTREE)/include
262 endif
263 UBOOTINCLUDE += -I$(srctree)/include \
264 -I$(srctree)/arch/$(ARCH)/include
265
266 KBUILD_CPPFLAGS := -D__KERNEL__
267
268 KBUILD_CFLAGS := -Wall -Wstrict-prototypes \
269 -Wno-format-security \
270 -fno-builtin -ffreestanding
271 KBUILD_AFLAGS := -D__ASSEMBLY__
272
273 export CONFIG_SHELL HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE AS LD CC
274 export CPP AR NM LDR STRIP OBJCOPY OBJDUMP
275 export MAKE AWK
276 export DTC CHECK CHECKFLAGS
277
278 export KBUILD_CPPFLAGS NOSTDINC_FLAGS UBOOTINCLUDE
279 export KBUILD_CFLAGS KBUILD_AFLAGS
280
281 KBUILD_CFLAGS += -Os #-fomit-frame-pointer
282
283 ifdef BUILD_TAG
284 KBUILD_CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
285 endif
286
287 KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
288
289 KBUILD_CFLAGS += -g
290 # $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
291 # option to the assembler.
292 KBUILD_AFLAGS += -g
293
294 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
295 CHECKFLAGS += $(NOSTDINC_FLAGS)
296
297 # Report stack usage if supported
298 KBUILD_CFLAGS += $(call cc-option,-fstack-usage)
299
300 KBUILD_CFLAGS += $(call cc-option,-Wno-format-nonliteral)
301
302 # turn jbsr into jsr for m68k
303 ifeq ($(ARCH),m68k)
304 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
305 KBUILD_AFLAGS += -Wa,-gstabs,-S
306 endif
307 endif
308
309 # load other configuration
310 include $(TOPDIR)/config.mk
311
312 ifneq ($(CONFIG_SYS_TEXT_BASE),)
313 KBUILD_CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
314 endif
315
316 export CONFIG_SYS_TEXT_BASE
317
318 LDFLAGS_u-boot += -T u-boot.lds $(LDFLAGS_FINAL)
319 ifneq ($(CONFIG_SYS_TEXT_BASE),)
320 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
321 endif
322
323 # Targets which don't build the source code
324 NON_BUILD_TARGETS = backup clean clobber distclean mrproper tidy unconfig %_config
325
326 # Only do the generic board check when actually building, not configuring
327 ifeq ($(filter $(NON_BUILD_TARGETS),$(MAKECMDGOALS)),)
328 ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
329 ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
330 CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \
331 Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
332 endif
333 endif
334 endif
335
336 # If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
337 # that (or fail if absent). Otherwise, search for a linker script in a
338 # standard location.
339
340 LDSCRIPT_MAKEFILE_DIR = $(dir $(LDSCRIPT))
341
342 ifndef LDSCRIPT
343 #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
344 ifdef CONFIG_SYS_LDSCRIPT
345 # need to strip off double quotes
346 LDSCRIPT := $(CONFIG_SYS_LDSCRIPT:"%"=%)
347 endif
348 endif
349
350 # If there is no specified link script, we look in a number of places for it
351 ifndef LDSCRIPT
352 ifeq ($(CONFIG_NAND_U_BOOT),y)
353 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
354 ifeq ($(wildcard $(LDSCRIPT)),)
355 LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
356 endif
357 endif
358 ifeq ($(wildcard $(LDSCRIPT)),)
359 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
360 endif
361 ifeq ($(wildcard $(LDSCRIPT)),)
362 LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot.lds
363 endif
364 ifeq ($(wildcard $(LDSCRIPT)),)
365 LDSCRIPT := $(TOPDIR)/arch/$(ARCH)/cpu/u-boot.lds
366 # We don't expect a Makefile here
367 LDSCRIPT_MAKEFILE_DIR =
368 endif
369 ifeq ($(wildcard $(LDSCRIPT)),)
370 $(error could not find linker script)
371 endif
372 endif
373
374 #########################################################################
375 # U-Boot objects....order is important (i.e. start must be first)
376
377 head-y := $(CPUDIR)/start.o
378 head-$(CONFIG_4xx) += arch/powerpc/cpu/ppc4xx/resetvec.o
379 head-$(CONFIG_MPC85xx) += arch/powerpc/cpu/mpc85xx/resetvec.o
380
381 OBJS := $(head-y)
382
383 HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(srctree)/board/$(VENDOR)/common/Makefile),y,n)
384
385 LIBS-y += lib/
386 LIBS-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/
387 LIBS-y += $(CPUDIR)/
388 ifdef SOC
389 LIBS-y += $(CPUDIR)/$(SOC)/
390 endif
391 LIBS-$(CONFIG_IXP4XX_NPE) += drivers/net/npe/
392 LIBS-$(CONFIG_OF_EMBED) += dts/
393 LIBS-y += arch/$(ARCH)/lib/
394 LIBS-y += fs/
395 LIBS-y += net/
396 LIBS-y += disk/
397 LIBS-y += drivers/
398 LIBS-y += drivers/dma/
399 LIBS-y += drivers/gpio/
400 LIBS-y += drivers/i2c/
401 LIBS-y += drivers/input/
402 LIBS-y += drivers/mmc/
403 LIBS-y += drivers/mtd/
404 LIBS-$(CONFIG_CMD_NAND) += drivers/mtd/nand/
405 LIBS-y += drivers/mtd/onenand/
406 LIBS-$(CONFIG_CMD_UBI) += drivers/mtd/ubi/
407 LIBS-y += drivers/mtd/spi/
408 LIBS-y += drivers/net/
409 LIBS-y += drivers/net/phy/
410 LIBS-y += drivers/pci/
411 LIBS-y += drivers/power/ \
412 drivers/power/fuel_gauge/ \
413 drivers/power/mfd/ \
414 drivers/power/pmic/ \
415 drivers/power/battery/
416 LIBS-y += drivers/spi/
417 LIBS-$(CONFIG_FMAN_ENET) += drivers/net/fm/
418 LIBS-$(CONFIG_SYS_FSL_DDR) += drivers/ddr/fsl/
419 LIBS-y += drivers/serial/
420 LIBS-y += drivers/usb/eth/
421 LIBS-y += drivers/usb/gadget/
422 LIBS-y += drivers/usb/host/
423 LIBS-y += drivers/usb/musb/
424 LIBS-y += drivers/usb/musb-new/
425 LIBS-y += drivers/usb/phy/
426 LIBS-y += drivers/usb/ulpi/
427 LIBS-y += common/
428 LIBS-y += lib/libfdt/
429 LIBS-$(CONFIG_API) += api/
430 LIBS-$(CONFIG_HAS_POST) += post/
431 LIBS-y += test/
432
433 ifneq (,$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35 mxs vf610))
434 LIBS-y += arch/$(ARCH)/imx-common/
435 endif
436
437 LIBS-$(CONFIG_ARM) += arch/arm/cpu/
438 LIBS-$(CONFIG_PPC) += arch/powerpc/cpu/
439
440 LIBS-y += board/$(BOARDDIR)/
441
442 LIBS-y := $(patsubst %/, %/built-in.o, $(LIBS-y))
443 LIBS := $(sort $(LIBS-y))
444 .PHONY : $(LIBS)
445
446 # Add GCC lib
447 ifdef USE_PRIVATE_LIBGCC
448 ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
449 PLATFORM_LIBGCC = $(OBJTREE)/arch/$(ARCH)/lib/libgcc.o
450 else
451 PLATFORM_LIBGCC = -L $(USE_PRIVATE_LIBGCC) -lgcc
452 endif
453 else
454 PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(CFLAGS) -print-libgcc-file-name`) -lgcc
455 endif
456 PLATFORM_LIBS += $(PLATFORM_LIBGCC)
457 export PLATFORM_LIBS
458
459 # Special flags for CPP when processing the linker script.
460 # Pass the version down so we can handle backwards compatibility
461 # on the fly.
462 LDPPFLAGS += \
463 -include $(TOPDIR)/include/u-boot/u-boot.lds.h \
464 -DCPUDIR=$(CPUDIR) \
465 $(shell $(LD) --version | \
466 sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
467
468 #########################################################################
469 #########################################################################
470
471 ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
472 BOARD_SIZE_CHECK = \
473 @actual=`wc -c $@ | awk '{print $$1}'`; \
474 limit=`printf "%d" $(CONFIG_BOARD_SIZE_LIMIT)`; \
475 if test $$actual -gt $$limit; then \
476 echo "$@ exceeds file size limit:" >&2 ; \
477 echo " limit: $$limit bytes" >&2 ; \
478 echo " actual: $$actual bytes" >&2 ; \
479 echo " excess: $$((actual - limit)) bytes" >&2; \
480 exit 1; \
481 fi
482 else
483 BOARD_SIZE_CHECK =
484 endif
485
486 # Statically apply RELA-style relocations (currently arm64 only)
487 ifneq ($(CONFIG_STATIC_RELA),)
488 # $(1) is u-boot ELF, $(2) is u-boot bin, $(3) is text base
489 DO_STATIC_RELA = \
490 start=$$($(NM) $(1) | grep __rel_dyn_start | cut -f 1 -d ' '); \
491 end=$$($(NM) $(1) | grep __rel_dyn_end | cut -f 1 -d ' '); \
492 tools/relocate-rela $(2) $(3) $$start $$end
493 else
494 DO_STATIC_RELA =
495 endif
496
497 # Always append ALL so that arch config.mk's can add custom ones
498 ALL-y += u-boot.srec u-boot.bin System.map
499
500 ALL-$(CONFIG_NAND_U_BOOT) += u-boot-nand.bin
501 ALL-$(CONFIG_ONENAND_U_BOOT) += u-boot-onenand.bin
502 ALL-$(CONFIG_RAMBOOT_PBL) += u-boot.pbl
503 ALL-$(CONFIG_SPL) += spl/u-boot-spl.bin
504 ALL-$(CONFIG_SPL_FRAMEWORK) += u-boot.img
505 ALL-$(CONFIG_TPL) += tpl/u-boot-tpl.bin
506 ALL-$(CONFIG_OF_SEPARATE) += u-boot.dtb u-boot-dtb.bin
507 ifneq ($(CONFIG_SPL_TARGET),)
508 ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
509 endif
510 ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
511
512 # enable combined SPL/u-boot/dtb rules for tegra
513 ifneq ($(CONFIG_TEGRA),)
514 ifeq ($(CONFIG_SPL),y)
515 ifeq ($(CONFIG_OF_SEPARATE),y)
516 ALL-y += u-boot-dtb-tegra.bin
517 else
518 ALL-y += u-boot-nodtb-tegra.bin
519 endif
520 endif
521 endif
522
523 all: $(ALL-y) $(SUBDIR_EXAMPLES-y)
524
525 u-boot.dtb: checkdtc u-boot
526 $(MAKE) $(build)=dts binary
527 mv dts/dt.dtb $@
528
529 u-boot-dtb.bin: u-boot.bin u-boot.dtb
530 cat $^ >$@
531
532 u-boot.hex: u-boot
533 $(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@
534
535 u-boot.srec: u-boot
536 $(OBJCOPY) ${OBJCFLAGS} -O srec $< $@
537
538 u-boot.bin: u-boot
539 $(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
540 $(call DO_STATIC_RELA,$<,$@,$(CONFIG_SYS_TEXT_BASE))
541 $(BOARD_SIZE_CHECK)
542
543 u-boot.ldr: u-boot
544 $(CREATE_LDR_ENV)
545 $(LDR) -T $(CONFIG_BFIN_CPU) -c $@ $< $(LDR_FLAGS)
546 $(BOARD_SIZE_CHECK)
547
548 u-boot.ldr.hex: u-boot.ldr
549 $(OBJCOPY) ${OBJCFLAGS} -O ihex $< $@ -I binary
550
551 u-boot.ldr.srec: u-boot.ldr
552 $(OBJCOPY) ${OBJCFLAGS} -O srec $< $@ -I binary
553
554 #
555 # U-Boot entry point, needed for booting of full-blown U-Boot
556 # from the SPL U-Boot version.
557 #
558 ifndef CONFIG_SYS_UBOOT_START
559 CONFIG_SYS_UBOOT_START := 0
560 endif
561
562 u-boot.img: u-boot.bin
563 tools/mkimage -A $(ARCH) -T firmware -C none \
564 -O u-boot -a $(CONFIG_SYS_TEXT_BASE) \
565 -e $(CONFIG_SYS_UBOOT_START) \
566 -n $(shell sed -n -e 's/.*U_BOOT_VERSION//p' $(VERSION_FILE) | \
567 sed -e 's/"[ ]*$$/ for $(BOARD) board"/') \
568 -d $< $@
569
570 u-boot.imx: u-boot.bin depend
571 $(MAKE) $(build)=arch/arm/imx-common $(objtree)/u-boot.imx
572
573 u-boot.kwb: u-boot.bin
574 tools/mkimage -n $(CONFIG_SYS_KWD_CONFIG) -T kwbimage \
575 -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) -d $< $@
576
577 u-boot.pbl: u-boot.bin
578 tools/mkimage -n $(CONFIG_SYS_FSL_PBL_RCW) \
579 -R $(CONFIG_SYS_FSL_PBL_PBI) -T pblimage \
580 -d $< $@
581
582 u-boot.sha1: u-boot.bin
583 tools/ubsha1 u-boot.bin
584
585 u-boot.dis: u-boot
586 $(OBJDUMP) -d $< > $@
587
588 # $@ is output, $(1) and $(2) are inputs, $(3) is padded intermediate,
589 # $(4) is pad-to
590 SPL_PAD_APPEND = \
591 $(OBJCOPY) ${OBJCFLAGS} --pad-to=$(4) -I binary -O binary \
592 $(1) $(3); \
593 cat $(3) $(2) > $@; \
594 rm $(3)
595
596 ifdef CONFIG_TPL
597 SPL_PAYLOAD := tpl/u-boot-with-tpl.bin
598 else
599 SPL_PAYLOAD := u-boot.bin
600 endif
601
602 u-boot-with-spl.bin: spl/u-boot-spl.bin $(SPL_PAYLOAD)
603 $(call SPL_PAD_APPEND,$<,$(SPL_PAYLOAD),spl/u-boot-spl-pad.bin,$(CONFIG_SPL_PAD_TO))
604
605 tpl/u-boot-with-tpl.bin: tpl/u-boot-tpl.bin u-boot.bin
606 $(call SPL_PAD_APPEND,$<,u-boot.bin,tpl/u-boot-tpl-pad.bin,$(CONFIG_TPL_PAD_TO))
607
608 u-boot-with-spl.imx: spl/u-boot-spl.bin u-boot.bin
609 $(MAKE) $(build)=arch/arm/imx-common \
610 $(OBJTREE)/u-boot-with-spl.imx
611
612 u-boot-with-nand-spl.imx: spl/u-boot-spl.bin u-boot.bin
613 $(MAKE) $(build)=arch/arm/imx-common \
614 $(OBJTREE)/u-boot-with-nand-spl.imx
615
616 u-boot.ubl: u-boot-with-spl.bin
617 tools/mkimage -n $(UBL_CONFIG) -T ublimage \
618 -e $(CONFIG_SYS_TEXT_BASE) -d $< u-boot.ubl
619
620 u-boot.ais: spl/u-boot-spl.bin u-boot.img
621 tools/mkimage -s -n $(if $(CONFIG_AIS_CONFIG_FILE),$(srctree)/$(CONFIG_AIS_CONFIG_FILE:"%"=%),"/dev/null") \
622 -T aisimage \
623 -e $(CONFIG_SPL_TEXT_BASE) \
624 -d spl/u-boot-spl.bin \
625 spl/u-boot-spl.ais
626 $(OBJCOPY) ${OBJCFLAGS} -I binary \
627 --pad-to=$(CONFIG_SPL_MAX_SIZE) -O binary \
628 spl/u-boot-spl.ais spl/u-boot-spl-pad.ais
629 cat spl/u-boot-spl-pad.ais u-boot.img > u-boot.ais
630
631
632 u-boot.sb: u-boot.bin spl/u-boot-spl.bin
633 $(MAKE) $(build)=$(CPUDIR)/$(SOC)/ $(OBJTREE)/u-boot.sb
634
635 # On x600 (SPEAr600) U-Boot is appended to U-Boot SPL.
636 # Both images are created using mkimage (crc etc), so that the ROM
637 # bootloader can check its integrity. Padding needs to be done to the
638 # SPL image (with mkimage header) and not the binary. Otherwise the resulting image
639 # which is loaded/copied by the ROM bootloader to SRAM doesn't fit.
640 # The resulting image containing both U-Boot images is called u-boot.spr
641 u-boot.spr: u-boot.img spl/u-boot-spl.bin
642 tools/mkimage -A $(ARCH) -T firmware -C none \
643 -a $(CONFIG_SPL_TEXT_BASE) -e $(CONFIG_SPL_TEXT_BASE) -n XLOADER \
644 -d spl/u-boot-spl.bin $@
645 $(OBJCOPY) -I binary -O binary \
646 --pad-to=$(CONFIG_SPL_PAD_TO) --gap-fill=0xff $@
647 cat u-boot.img >> $@
648
649 ifneq ($(CONFIG_TEGRA),)
650 u-boot-nodtb-tegra.bin: spl/u-boot-spl.bin u-boot.bin
651 $(OBJCOPY) ${OBJCFLAGS} --pad-to=$(CONFIG_SYS_TEXT_BASE) -O binary spl/u-boot-spl spl/u-boot-spl-pad.bin
652 cat spl/u-boot-spl-pad.bin u-boot.bin > $@
653 rm spl/u-boot-spl-pad.bin
654
655 ifeq ($(CONFIG_OF_SEPARATE),y)
656 u-boot-dtb-tegra.bin: u-boot-nodtb-tegra.bin u-boot.dtb
657 cat u-boot-nodtb-tegra.bin u-boot.dtb > $@
658 endif
659 endif
660
661 u-boot-img.bin: spl/u-boot-spl.bin u-boot.img
662 cat spl/u-boot-spl.bin u-boot.img > $@
663
664 # PPC4xx needs the SPL at the end of the image, since the reset vector
665 # is located at 0xfffffffc. So we can't use the "u-boot-img.bin" target
666 # and need to introduce a new build target with the full blown U-Boot
667 # at the start padded up to the start of the SPL image. And then concat
668 # the SPL image to the end.
669 u-boot-img-spl-at-end.bin: spl/u-boot-spl.bin u-boot.img
670 $(OBJCOPY) -I binary -O binary --pad-to=$(CONFIG_UBOOT_PAD_TO) \
671 --gap-fill=0xff u-boot.img $@
672 cat spl/u-boot-spl.bin >> $@
673
674 # Create a new ELF from a raw binary file. This is useful for arm64
675 # where static relocation needs to be performed on the raw binary,
676 # but certain simulators only accept an ELF file (but don't do the
677 # relocation).
678 # FIXME refactor dts/Makefile to share target/arch detection
679 u-boot.elf: u-boot.bin
680 @$(OBJCOPY) -B aarch64 -I binary -O elf64-littleaarch64 \
681 $< u-boot-elf.o
682 @$(LD) u-boot-elf.o -o $@ \
683 --defsym=_start=$(CONFIG_SYS_TEXT_BASE) \
684 -Ttext=$(CONFIG_SYS_TEXT_BASE)
685
686 ifeq ($(CONFIG_SANDBOX),y)
687 GEN_UBOOT = \
688 $(CC) $(SYMS) -T u-boot.lds \
689 -Wl,--start-group $(LIBS) -Wl,--end-group \
690 $(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map -o u-boot
691 else
692 GEN_UBOOT = \
693 $(LD) $(LDFLAGS) $(LDFLAGS_$(@F)) \
694 $(OBJS) \
695 --start-group $(LIBS) --end-group $(PLATFORM_LIBS) \
696 -Map u-boot.map -o u-boot
697 endif
698
699 u-boot: depend $(SUBDIR_TOOLS) $(OBJS) $(LIBS) u-boot.lds
700 $(GEN_UBOOT)
701 ifeq ($(CONFIG_KALLSYMS),y)
702 smap=`$(call SYSTEM_MAP,u-boot) | \
703 awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\\\000"}'` ; \
704 $(CC) $(CFLAGS) -DSYSTEM_MAP="\"$${smap}\"" \
705 -c $(srctree)/common/system_map.c -o common/system_map.o
706 $(GEN_UBOOT) common/system_map.o
707 endif
708
709 $(OBJS):
710 @:
711
712 $(LIBS): depend $(SUBDIR_TOOLS)
713 $(MAKE) $(build)=$(patsubst %/,%,$(dir $@))
714
715 $(SUBDIRS): depend
716 $(MAKE) $(build)=$@ all
717
718 $(SUBDIR_EXAMPLES-y): u-boot
719
720 u-boot.lds: $(LDSCRIPT) depend
721 $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$< >$@
722
723 nand_spl: $(TIMESTAMP_FILE) $(VERSION_FILE) depend
724 $(MAKE) $(build)=nand_spl/board/$(BOARDDIR) all
725
726 u-boot-nand.bin: nand_spl u-boot.bin
727 cat nand_spl/u-boot-spl-16k.bin u-boot.bin > u-boot-nand.bin
728
729 spl/u-boot-spl.bin: $(SUBDIR_TOOLS) depend
730 $(MAKE) obj=spl -f $(srctree)/spl/Makefile all
731
732 tpl/u-boot-tpl.bin: $(SUBDIR_TOOLS) depend
733 $(MAKE) obj=tpl -f $(srctree)/spl/Makefile all CONFIG_TPL_BUILD=y
734
735 # Explicitly make _depend in subdirs containing multiple targets to prevent
736 # parallel sub-makes creating .depend files simultaneously.
737 depend dep: $(TIMESTAMP_FILE) $(VERSION_FILE) \
738 include/spl-autoconf.mk \
739 include/tpl-autoconf.mk \
740 include/autoconf.mk \
741 include/generated/generic-asm-offsets.h \
742 include/generated/asm-offsets.h
743
744 TAG_SUBDIRS = $(SUBDIRS)
745 TAG_SUBDIRS += $(dir $(LIBS))
746 TAG_SUBDIRS += include
747
748 FIND := find
749 FINDFLAGS := -L
750
751 checkstack:
752 $(CROSS_COMPILE)objdump -d u-boot \
753 `$(FIND) . -name u-boot-spl -print` | \
754 perl $(src)/scripts/checkstack.pl $(ARCH)
755
756 tags ctags:
757 ctags -w -o ctags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
758 -name '*.[chS]' -print`
759
760 etags:
761 etags -a -o $(obj)etags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
762 -name '*.[chS]' -print`
763 cscope:
764 $(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) -name '*.[chS]' -print > \
765 cscope.files
766 cscope -b -q -k
767
768 SYSTEM_MAP = \
769 $(NM) $1 | \
770 grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
771 LC_ALL=C sort
772 System.map: u-boot
773 @$(call SYSTEM_MAP,$<) > $@
774
775 checkthumb:
776 @if test $(call cc-version) -lt 0404; then \
777 echo -n '*** Your GCC does not produce working '; \
778 echo 'binaries in THUMB mode.'; \
779 echo '*** Your board is configured for THUMB mode.'; \
780 false; \
781 fi
782
783 # GCC 3.x is reported to have problems generating the type of relocation
784 # that U-Boot wants.
785 # See http://lists.denx.de/pipermail/u-boot/2012-September/135156.html
786 checkgcc4:
787 @if test $(call cc-version) -lt 0400; then \
788 echo -n '*** Your GCC is too old, please upgrade to GCC 4.x or newer'; \
789 false; \
790 fi
791
792 checkdtc:
793 @if test $(call dtc-version) -lt 0104; then \
794 echo '*** Your dtc is too old, please upgrade to dtc 1.4 or newer'; \
795 false; \
796 fi
797
798 #
799 # Auto-generate the autoconf.mk file (which is included by all makefiles)
800 #
801 # This target actually generates 2 files; autoconf.mk and autoconf.mk.dep.
802 # the dep file is only include in this top level makefile to determine when
803 # to regenerate the autoconf.mk file.
804 include/autoconf.mk.dep: include/config.h include/common.h
805 @$(XECHO) Generating $@ ; \
806 : Generate the dependancies ; \
807 $(CC) -x c -DDO_DEPS_ONLY -M $(CFLAGS) $(CPPFLAGS) \
808 -MQ include/autoconf.mk $(srctree)/include/common.h > $@ || \
809 rm $@
810
811 include/autoconf.mk: include/config.h
812 @$(XECHO) Generating $@ ; \
813 : Extract the config macros ; \
814 $(CPP) $(CFLAGS) -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
815 sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
816 rm $@.tmp
817
818 # Auto-generate the spl-autoconf.mk file (which is included by all makefiles for SPL)
819 include/tpl-autoconf.mk: include/config.h
820 @$(XECHO) Generating $@ ; \
821 : Extract the config macros ; \
822 $(CPP) $(CFLAGS) -DCONFIG_TPL_BUILD -DCONFIG_SPL_BUILD\
823 -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
824 sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
825 rm $@.tmp
826
827 include/spl-autoconf.mk: include/config.h
828 @$(XECHO) Generating $@ ; \
829 : Extract the config macros ; \
830 $(CPP) $(CFLAGS) -DCONFIG_SPL_BUILD -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && \
831 sed -n -f $(srctree)/tools/scripts/define2mk.sed $@.tmp > $@; \
832 rm $@.tmp
833
834 include/generated/generic-asm-offsets.h: lib/asm-offsets.s
835 @$(XECHO) Generating $@
836 $(srctree)/tools/scripts/make-asm-offsets lib/asm-offsets.s $@
837
838 lib/asm-offsets.s: include/config.h $(srctree)/lib/asm-offsets.c
839 @mkdir -p lib
840 $(CC) -DDO_DEPS_ONLY \
841 $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
842 -o $@ $(srctree)/lib/asm-offsets.c -c -S
843
844 include/generated/asm-offsets.h: $(CPUDIR)/$(SOC)/asm-offsets.s
845 @$(XECHO) Generating $@
846 $(srctree)/tools/scripts/make-asm-offsets $(CPUDIR)/$(SOC)/asm-offsets.s $@
847
848 $(CPUDIR)/$(SOC)/asm-offsets.s: include/config.h
849 @mkdir -p $(CPUDIR)/$(SOC)
850 if [ -f $(srctree)/$(CPUDIR)/$(SOC)/asm-offsets.c ];then \
851 $(CC) -DDO_DEPS_ONLY \
852 $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
853 -o $@ $(srctree)/$(CPUDIR)/$(SOC)/asm-offsets.c -c -S; \
854 else \
855 touch $@; \
856 fi
857
858 #########################################################################
859 else # !config.mk
860 all u-boot.hex u-boot.srec u-boot.bin \
861 u-boot.img u-boot.dis u-boot \
862 $(filter-out tools,$(SUBDIRS)) \
863 depend dep tags ctags etags cscope System.map:
864 @echo "System not configured - see README" >&2
865 @ exit 1
866
867 tools: $(VERSION_FILE) $(TIMESTAMP_FILE)
868 $(MAKE) $(build)=$@ all
869 endif # config.mk
870
871 # ARM relocations should all be R_ARM_RELATIVE (32-bit) or
872 # R_AARCH64_RELATIVE (64-bit).
873 checkarmreloc: u-boot
874 @RELOC="`$(CROSS_COMPILE)readelf -r -W $< | cut -d ' ' -f 4 | \
875 grep R_A | sort -u`"; \
876 if test "$$RELOC" != "R_ARM_RELATIVE" -a \
877 "$$RELOC" != "R_AARCH64_RELATIVE"; then \
878 echo "$< contains unexpected relocations: $$RELOC"; \
879 false; \
880 fi
881
882 $(VERSION_FILE):
883 @mkdir -p $(dir $(VERSION_FILE))
884 @( localvers='$(shell $(TOPDIR)/scripts/setlocalversion $(TOPDIR))' ; \
885 printf '#define PLAIN_VERSION "%s%s"\n' \
886 "$(U_BOOT_VERSION)" "$${localvers}" ; \
887 printf '#define U_BOOT_VERSION "U-Boot %s%s"\n' \
888 "$(U_BOOT_VERSION)" "$${localvers}" ; \
889 ) > $@.tmp
890 @( printf '#define CC_VERSION_STRING "%s"\n' \
891 '$(shell $(CC) --version | head -n 1)' )>> $@.tmp
892 @( printf '#define LD_VERSION_STRING "%s"\n' \
893 '$(shell $(LD) -v | head -n 1)' )>> $@.tmp
894 @cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
895
896 $(TIMESTAMP_FILE):
897 @mkdir -p $(dir $(TIMESTAMP_FILE))
898 @LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"' > $@.tmp
899 @LC_ALL=C date +'#define U_BOOT_TIME "%T"' >> $@.tmp
900 @cmp -s $@ $@.tmp && rm -f $@.tmp || mv -f $@.tmp $@
901
902 easylogo env gdb:
903 $(MAKE) $(build)=tools/$@ MTD_VERSION=${MTD_VERSION}
904
905 gdbtools: gdb
906
907 xmldocs pdfdocs psdocs htmldocs mandocs: tools/kernel-doc/docproc
908 $(MAKE) U_BOOT_VERSION=$(U_BOOT_VERSION) $(build)=doc/DocBook $@
909
910 tools-all: easylogo env gdb $(VERSION_FILE) $(TIMESTAMP_FILE)
911 $(MAKE) $(build)=tools HOST_TOOLS_ALL=y
912
913 .PHONY : CHANGELOG
914 CHANGELOG:
915 git log --no-merges U-Boot-1_1_5.. | \
916 unexpand -a | sed -e 's/\s\s*$$//' > $@
917
918 include/license.h: tools/bin2header COPYING
919 cat COPYING | gzip -9 -c | ./tools/bin2header license_gzip > include/license.h
920 #########################################################################
921
922 unconfig:
923 @rm -f include/config.h include/config.mk \
924 board/*/config.tmp board/*/*/config.tmp \
925 include/autoconf.mk include/autoconf.mk.dep \
926 include/spl-autoconf.mk \
927 include/tpl-autoconf.mk
928
929 %_config:: unconfig
930 @$(MKCONFIG) -A $(@:_config=)
931
932 #########################################################################
933
934 clean:
935 @rm -f examples/standalone/atmel_df_pow2 \
936 examples/standalone/hello_world \
937 examples/standalone/interrupt \
938 examples/standalone/mem_to_mem_idma2intr \
939 examples/standalone/sched \
940 $(addprefix examples/standalone/, smc91111_eeprom smc911x_eeprom) \
941 examples/standalone/test_burst \
942 examples/standalone/timer
943 @rm -f $(addprefix examples/api/, demo demo.bin)
944 @rm -f tools/bmp_logo tools/easylogo/easylogo \
945 tools/env/fw_printenv \
946 tools/envcrc \
947 $(addprefix tools/gdb/, gdbcont gdbsend) \
948 tools/gen_eth_addr tools/img2srec \
949 tools/dumpimage \
950 $(addprefix tools/, mkenvimage mkimage) \
951 tools/mpc86x_clk \
952 $(addprefix tools/, mk$(BOARD)spl mkexynosspl) \
953 tools/mxsboot \
954 tools/ncb tools/ubsha1 \
955 tools/kernel-doc/docproc \
956 tools/proftool
957 @rm -f $(addprefix board/cray/L1/, bootscript.c bootscript.image) \
958 board/matrix_vision/*/bootscript.img \
959 spl/board/samsung/$(BOARD)/tools/mk$(BOARD)spl \
960 u-boot.lds \
961 $(addprefix arch/blackfin/cpu/, init.lds init.elf)
962 @rm -f include/bmp_logo.h
963 @rm -f include/bmp_logo_data.h
964 @rm -f lib/asm-offsets.s
965 @rm -f include/generated/asm-offsets.h
966 @rm -f $(CPUDIR)/$(SOC)/asm-offsets.s
967 @rm -f $(TIMESTAMP_FILE) $(VERSION_FILE)
968 @$(MAKE) -f $(srctree)/doc/DocBook/Makefile cleandocs
969 @find $(OBJTREE) -type f \
970 \( -name 'core' -o -name '*.bak' -o -name '*~' -o -name '*.su' \
971 -o -name '*.o' -o -name '*.a' -o -name '*.exe' \
972 -o -name '*.cfgtmp' \) -print \
973 | xargs rm -f
974
975 # Removes everything not needed for testing u-boot
976 tidy: clean
977 @find $(OBJTREE) -type f \( -name '*.depend*' \) -print | xargs rm -f
978
979 clobber: tidy
980 @find $(OBJTREE) -type f \( -name '*.srec' \
981 -o -name '*.bin' -o -name u-boot.img \) \
982 -print0 | xargs -0 rm -f
983 @rm -f $(OBJS) *.bak ctags etags TAGS \
984 cscope.* *.*~
985 @rm -f u-boot u-boot.map u-boot.hex $(ALL-y)
986 @rm -f u-boot.kwb
987 @rm -f u-boot.pbl
988 @rm -f u-boot.imx
989 @rm -f u-boot-with-spl.imx
990 @rm -f u-boot-with-nand-spl.imx
991 @rm -f u-boot.ubl
992 @rm -f u-boot.ais
993 @rm -f u-boot.dtb
994 @rm -f u-boot.sb
995 @rm -f u-boot.spr
996 @rm -f $(addprefix nand_spl/, u-boot.lds u-boot.lst System.map)
997 @rm -f $(addprefix nand_spl/, u-boot-nand_spl.lds u-boot-spl u-boot-spl.map)
998 @rm -f $(addprefix spl/, u-boot-spl u-boot-spl.bin u-boot-spl.map)
999 @rm -f spl/u-boot-spl.lds
1000 @rm -f $(addprefix tpl/, u-boot-tpl u-boot-tpl.bin u-boot-tpl.map)
1001 @rm -f tpl/u-boot-spl.lds
1002 @rm -f MLO MLO.byteswap
1003 @rm -f SPL
1004 @rm -f tools/xway-swap-bytes
1005 @rm -fr include/asm/proc include/asm/arch include/asm
1006 @rm -fr include/generated
1007 @[ ! -d nand_spl ] || find nand_spl -name "*" -type l -print | xargs rm -f
1008 @rm -f dts/*.tmp
1009 @rm -f $(addprefix spl/, u-boot-spl.ais, u-boot-spl-pad.ais)
1010
1011 mrproper \
1012 distclean: clobber unconfig
1013 ifneq ($(OBJTREE),$(SRCTREE))
1014 rm -rf *
1015 endif
1016
1017 backup:
1018 F=`basename $(TOPDIR)` ; cd .. ; \
1019 gtar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F
1020
1021 #########################################################################
1022
1023 endif # skip-makefile
1024
1025 PHONY += FORCE
1026 FORCE:
1027
1028 # Declare the contents of the .PHONY variable as phony. We keep that
1029 # information in a variable so we can use it in if_changed and friends.
1030 .PHONY: $(PHONY)