2 # (C) Copyright 2000-2013
3 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 # SPDX-License-Identifier: GPL-2.0+
7 #########################################################################
9 # Set shell to bash if possible, otherwise fall back to sh
10 SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
11 else if [ -x /bin/bash ]; then echo /bin/bash; \
16 ifeq ($(CURDIR),$(SRCTREE))
19 dir := $(subst $(SRCTREE)/,,$(CURDIR))
22 ifneq ($(OBJTREE),$(SRCTREE))
23 # Create object files for SPL in a separate directory
24 ifeq ($(CONFIG_SPL_BUILD),y)
25 ifeq ($(CONFIG_TPL_BUILD),y)
26 obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
28 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
31 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
33 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
35 $(shell mkdir -p $(obj))
37 # Create object files for SPL in a separate directory
38 ifeq ($(CONFIG_SPL_BUILD),y)
39 ifeq ($(CONFIG_TPL_BUILD),y)
40 obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
42 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
45 $(shell mkdir -p $(obj))
57 #########################################################################
59 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
63 # Mac OS X / Darwin's C preprocessor is Apple specific. It
64 # generates numerous errors and warnings. We want to bypass it
65 # and use GNU C's cpp. To do this we pass the -traditional-cpp
66 # option to the compiler. Note that the -traditional-cpp flag
67 # DOES NOT have the same semantics as GNU C's flag, all it does
68 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
70 # Apple's linker is similar, thanks to the new 2 stage linking
71 # multiple symbol definitions are treated as errors, hence the
72 # -multiply_defined suppress option to turn off this error.
75 ifeq ($(HOSTOS),darwin)
76 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
77 DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.')
78 DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.')
80 os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
81 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
83 # Snow Leopards build environment has no longer restrictions as described above
84 HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc")
85 HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
86 HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")
91 ifeq ($(HOSTOS),cygwin)
95 #########################################################################
97 # Option checker, gcc version (courtesy linux kernel) to ensure
98 # only supported compiler options are used
100 CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
101 CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
103 -include $(CC_OPTIONS_CACHE_FILE)
105 cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
106 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
107 > /dev/null 2>&1; then \
108 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
111 ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
112 cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
114 cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
115 $(if $(call cc-option-sys,$1),$1,$2)))
119 # Usage gcc-ver := $(call cc-version)
120 cc-version = $(shell $(SHELL) $(SRCTREE)/scripts/gcc-version.sh $(CC))
121 binutils-version = $(shell $(SHELL) $(SRCTREE)/scripts/binutils-version.sh $(AS))
122 dtc-version = $(shell $(SHELL) $(SRCTREE)/scripts/dtc-version.sh $(DTC))
125 # Include the make variables (CC, etc...)
127 AS = $(CROSS_COMPILE)as
130 LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
131 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
133 CC = $(CROSS_COMPILE)gcc
135 AR = $(CROSS_COMPILE)ar
136 NM = $(CROSS_COMPILE)nm
137 LDR = $(CROSS_COMPILE)ldr
138 STRIP = $(CROSS_COMPILE)strip
139 OBJCOPY = $(CROSS_COMPILE)objcopy
140 OBJDUMP = $(CROSS_COMPILE)objdump
141 RANLIB = $(CROSS_COMPILE)RANLIB
145 #########################################################################
147 # Load generated board configuration
148 ifeq ($(CONFIG_TPL_BUILD),y)
149 # Include TPL autoconf
150 sinclude $(OBJTREE)/include/tpl-autoconf.mk
152 ifeq ($(CONFIG_SPL_BUILD),y)
153 # Include SPL autoconf
154 sinclude $(OBJTREE)/include/spl-autoconf.mk
156 # Include normal autoconf
157 sinclude $(OBJTREE)/include/autoconf.mk
160 sinclude $(OBJTREE)/include/config.mk
162 # Some architecture config.mk files need to know what CPUDIR is set to,
163 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
164 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
166 CPUDIR=arch/$(ARCH)/cpu/$(CPU)
167 ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
168 CPUDIR=arch/$(ARCH)/cpu
171 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules
172 sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules
175 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules
178 BOARDDIR = $(VENDOR)/$(BOARD)
183 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
186 #########################################################################
188 # We don't actually use $(ARFLAGS) anywhere anymore, so catch people
189 # who are porting old code to latest mainline but not updating $(AR).
190 ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
191 RELFLAGS= $(PLATFORM_RELFLAGS)
192 DBGFLAGS= -g # -DDEBUG
193 OPTFLAGS= -Os #-fomit-frame-pointer
195 OBJCFLAGS += --gap-fill=0xff
197 gccincdir := $(shell $(CC) -print-file-name=include)
199 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \
202 # Enable garbage collection of un-used sections for SPL
203 ifeq ($(CONFIG_SPL_BUILD),y)
204 CPPFLAGS += -ffunction-sections -fdata-sections
205 LDFLAGS_FINAL += --gc-sections
208 ifneq ($(CONFIG_SYS_TEXT_BASE),)
209 CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
212 ifeq ($(CONFIG_SPL_BUILD),y)
213 CPPFLAGS += -DCONFIG_SPL_BUILD
214 ifeq ($(CONFIG_TPL_BUILD),y)
215 CPPFLAGS += -DCONFIG_TPL_BUILD
219 # Does this architecture support generic board init?
220 ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
221 ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
222 CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \
223 Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
227 ifneq ($(OBJTREE),$(SRCTREE))
228 CPPFLAGS += -I$(OBJTREE)/include
231 CPPFLAGS += -I$(TOPDIR)/include -I$(SRCTREE)/arch/$(ARCH)/include
232 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \
233 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
235 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
238 CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
241 CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
242 CFLAGS += $(CFLAGS_SSP)
243 # Some toolchains enable security related warning flags by default,
244 # but they don't make much sense in the u-boot world, so disable them.
245 CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
246 $(call cc-option,-Wno-format-security)
247 CFLAGS += $(CFLAGS_WARN)
249 # Report stack usage if supported
250 CFLAGS_STACK := $(call cc-option,-fstack-usage)
251 CFLAGS += $(CFLAGS_STACK)
253 BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
255 ifeq ($(findstring examples/,$(BCURDIR)),)
256 ifeq ($(CONFIG_SPL_BUILD),)
258 CFLAGS += -finstrument-functions -DFTRACE
263 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
264 # option to the assembler.
267 # turn jbsr into jsr for m68k
269 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
270 AFLAGS_DEBUG := -Wa,-gstabs,-S
274 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
276 LDFLAGS += $(PLATFORM_LDFLAGS)
277 LDFLAGS_FINAL += -Bstatic
279 LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
280 ifneq ($(CONFIG_SYS_TEXT_BASE),)
281 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
284 LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
285 ifneq ($(CONFIG_SPL_TEXT_BASE),)
286 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
289 # Linus' kernel sanity checking tool
290 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
291 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
293 # Location of a usable BFD library, where we define "usable" as
294 # "built for ${HOST}, supports ${TARGET}". Sensible values are
295 # - When cross-compiling: the root of the cross-environment
296 # - Linux/ppc (native): /usr
297 # - NetBSD/ppc (native): you lose ... (must extract these from the
298 # binutils build directory, plus the native and U-Boot include
299 # files don't like each other)
301 # So far, this is used only by tools/gdb/Makefile.
303 ifeq ($(HOSTOS),darwin)
304 BFD_ROOT_DIR = /usr/local/tools
306 ifeq ($(HOSTARCH),$(ARCH))
310 #BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386
311 #BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386
312 BFD_ROOT_DIR = /opt/powerpc
316 #########################################################################
318 export HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE \
319 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
320 export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
322 #########################################################################
324 # Allow boards to use custom optimize flags on a per dir/file basis
325 ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
326 ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
327 EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
328 ALL_CFLAGS += $(EXTRA_CPPFLAGS)
330 # The _DEP version uses the $< file target (for dependency generation)
332 EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
333 $(CPPFLAGS_$(BCURDIR))
335 $(CPP) $(ALL_AFLAGS) -o $@ $<
337 $(CC) $(ALL_AFLAGS) -o $@ $< -c
339 ifneq ($(CHECKSRC),0)
340 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
342 $(CC) $(ALL_CFLAGS) -o $@ $< -c
344 $(CPP) $(ALL_CFLAGS) -o $@ $< -c
346 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S
348 #########################################################################
350 # If the list of objects to link is empty, just create an empty built-in.o
351 cmd_link_o_target = $(if $(strip $1),\
352 $(LD) $(LDFLAGS) -r -o $@ $1,\
353 rm -f $@; $(AR) rcs $@ )
355 #########################################################################