config.mk

   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
   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; \
  12         else echo sh; fi; fi)
  13
  14 export  SHELL
  15
  16 ifeq ($(CONFIG_TPL_BUILD),y)
  17 SPL_BIN := u-boot-tpl
  18 else
  19 SPL_BIN := u-boot-spl
  20 endif
  21
  22 ifeq ($(CURDIR),$(SRCTREE))
  23 dir :=
  24 else
  25 dir := $(subst $(SRCTREE)/,,$(CURDIR))
  26 endif
  27
  28 ifneq ($(OBJTREE),$(SRCTREE))
  29 # Create object files for SPL in a separate directory
  30 ifeq ($(CONFIG_SPL_BUILD),y)
  31 ifeq ($(CONFIG_TPL_BUILD),y)
  32 obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
  33 else
  34 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
  35 endif
  36 else
  37 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  38 endif
  39 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  40
  41 $(shell mkdir -p $(obj))
  42 else
  43 # Create object files for SPL in a separate directory
  44 ifeq ($(CONFIG_SPL_BUILD),y)
  45 ifeq ($(CONFIG_TPL_BUILD),y)
  46 obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/)
  47 else
  48 obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
  49
  50 endif
  51 $(shell mkdir -p $(obj))
  52 else
  53 obj :=
  54 endif
  55 src :=
  56 endif
  57
  58 # clean the slate ...
  59 PLATFORM_RELFLAGS =
  60 PLATFORM_CPPFLAGS =
  61 PLATFORM_LDFLAGS =
  62
  63 #########################################################################
  64
  65 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
  66                   $(HOSTCPPFLAGS)
  67 HOSTSTRIP       = strip
  68
  69 #
  70 # Mac OS X / Darwin's C preprocessor is Apple specific.  It
  71 # generates numerous errors and warnings.  We want to bypass it
  72 # and use GNU C's cpp.  To do this we pass the -traditional-cpp
  73 # option to the compiler.  Note that the -traditional-cpp flag
  74 # DOES NOT have the same semantics as GNU C's flag, all it does
  75 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
  76 #
  77 # Apple's linker is similar, thanks to the new 2 stage linking
  78 # multiple symbol definitions are treated as errors, hence the
  79 # -multiply_defined suppress option to turn off this error.
  80 #
  81
  82 ifeq ($(HOSTOS),darwin)
  83 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
  84 DARWIN_MAJOR_VERSION    = $(shell sw_vers -productVersion | cut -f 1 -d '.')
  85 DARWIN_MINOR_VERSION    = $(shell sw_vers -productVersion | cut -f 2 -d '.')
  86
  87 os_x_before     = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
  88         $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
  89
  90 # Snow Leopards build environment has no longer restrictions as described above
  91 HOSTCC           = $(call os_x_before, 10, 5, "cc", "gcc")
  92 HOSTCFLAGS      += $(call os_x_before, 10, 4, "-traditional-cpp")
  93 HOSTLDFLAGS     += $(call os_x_before, 10, 5, "-multiply_defined suppress")
  94 else
  95 HOSTCC          = gcc
  96 endif
  97
  98 ifeq ($(HOSTOS),cygwin)
  99 HOSTCFLAGS      += -ansi
 100 endif
 101
 102 # We build some files with extra pedantic flags to try to minimize things
 103 # that won't build on some weird host compiler -- though there are lots of
 104 # exceptions for files that aren't complaint.
 105
 106 HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
 107 HOSTCFLAGS      += -pedantic
 108
 109 #########################################################################
 110 #
 111 # Option checker, gcc version (courtesy linux kernel) to ensure
 112 # only supported compiler options are used
 113 #
 114 CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
 115 CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
 116
 117 -include $(CC_OPTIONS_CACHE_FILE)
 118
 119 cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
 120                 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
 121                 > /dev/null 2>&1; then \
 122                 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
 123                 echo "$(1)"; fi)
 124
 125 ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
 126 cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
 127 else
 128 cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
 129                 $(if $(call cc-option-sys,$1),$1,$2)))
 130 endif
 131
 132 # cc-version
 133 # Usage gcc-ver := $(call cc-version)
 134 cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
 135 binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS))
 136 dtc-version = $(shell $(SHELL) $(SRCTREE)/tools/dtc-version.sh $(DTC))
 137
 138 #
 139 # Include the make variables (CC, etc...)
 140 #
 141 AS      = $(CROSS_COMPILE)as
 142
 143 # Always use GNU ld
 144 LD      = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
 145                 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
 146
 147 CC      = $(CROSS_COMPILE)gcc
 148 CPP     = $(CC) -E
 149 AR      = $(CROSS_COMPILE)ar
 150 NM      = $(CROSS_COMPILE)nm
 151 LDR     = $(CROSS_COMPILE)ldr
 152 STRIP   = $(CROSS_COMPILE)strip
 153 OBJCOPY = $(CROSS_COMPILE)objcopy
 154 OBJDUMP = $(CROSS_COMPILE)objdump
 155 RANLIB  = $(CROSS_COMPILE)RANLIB
 156 DTC     = dtc
 157 CHECK   = sparse
 158
 159 #########################################################################
 160
 161 # Load generated board configuration
 162 ifeq ($(CONFIG_TPL_BUILD),y)
 163 # Include TPL autoconf
 164 sinclude $(OBJTREE)/include/tpl-autoconf.mk
 165 else
 166 ifeq ($(CONFIG_SPL_BUILD),y)
 167 # Include SPL autoconf
 168 sinclude $(OBJTREE)/include/spl-autoconf.mk
 169 else
 170 # Include normal autoconf
 171 sinclude $(OBJTREE)/include/autoconf.mk
 172 endif
 173 endif
 174 sinclude $(OBJTREE)/include/config.mk
 175
 176 # Some architecture config.mk files need to know what CPUDIR is set to,
 177 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 178 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
 179 # CPU-specific code.
 180 CPUDIR=arch/$(ARCH)/cpu/$(CPU)
 181 ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
 182 CPUDIR=arch/$(ARCH)/cpu
 183 endif
 184
 185 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk       # include architecture dependend rules
 186 sinclude $(TOPDIR)/$(CPUDIR)/config.mk          # include  CPU  specific rules
 187
 188 ifdef   SOC
 189 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk   # include  SoC  specific rules
 190 endif
 191 ifdef   VENDOR
 192 BOARDDIR = $(VENDOR)/$(BOARD)
 193 else
 194 BOARDDIR = $(BOARD)
 195 endif
 196 ifdef   BOARD
 197 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 198 endif
 199
 200 #########################################################################
 201
 202 # We don't actually use $(ARFLAGS) anywhere anymore, so catch people
 203 # who are porting old code to latest mainline but not updating $(AR).
 204 ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
 205 RELFLAGS= $(PLATFORM_RELFLAGS)
 206 DBGFLAGS= -g # -DDEBUG
 207 OPTFLAGS= -Os #-fomit-frame-pointer
 208
 209 OBJCFLAGS += --gap-fill=0xff
 210
 211 gccincdir := $(shell $(CC) -print-file-name=include)
 212
 213 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 214         -D__KERNEL__
 215
 216 # Enable garbage collection of un-used sections for SPL
 217 ifeq ($(CONFIG_SPL_BUILD),y)
 218 CPPFLAGS += -ffunction-sections -fdata-sections
 219 LDFLAGS_FINAL += --gc-sections
 220 endif
 221
 222 # TODO(sjg@chromium.org): Is this correct on Mac OS?
 223 ifdef CONFIG_FIT_SIGNATURE
 224 HOSTLIBS        += -lssl -lcrypto
 225
 226 # This affects include/image.h, but including the board config file
 227 # is tricky, so manually define this options here.
 228 HOSTCFLAGS      += -DCONFIG_FIT_SIGNATURE
 229 endif
 230
 231 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 232 CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 233 endif
 234
 235 ifneq ($(CONFIG_SPL_PAD_TO),)
 236 CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO)
 237 endif
 238
 239 ifeq ($(CONFIG_SPL_BUILD),y)
 240 CPPFLAGS += -DCONFIG_SPL_BUILD
 241 ifeq ($(CONFIG_TPL_BUILD),y)
 242 CPPFLAGS += -DCONFIG_TPL_BUILD
 243 endif
 244 endif
 245
 246 # Does this architecture support generic board init?
 247 ifeq ($(__HAVE_ARCH_GENERIC_BOARD),)
 248 ifneq ($(CONFIG_SYS_GENERIC_BOARD),)
 249 CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \
 250 Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file)
 251 endif
 252 endif
 253
 254 ifneq ($(OBJTREE),$(SRCTREE))
 255 CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 256 endif
 257
 258 CPPFLAGS += -I$(TOPDIR)/include
 259 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 260         -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 261
 262 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 263
 264 ifdef BUILD_TAG
 265 CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"'
 266 endif
 267
 268 CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
 269 CFLAGS += $(CFLAGS_SSP)
 270 # Some toolchains enable security related warning flags by default,
 271 # but they don't make much sense in the u-boot world, so disable them.
 272 CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
 273                $(call cc-option,-Wno-format-security)
 274 CFLAGS += $(CFLAGS_WARN)
 275
 276 # Report stack usage if supported
 277 CFLAGS_STACK := $(call cc-option,-fstack-usage)
 278 CFLAGS += $(CFLAGS_STACK)
 279
 280 BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 281
 282 ifeq ($(findstring examples/,$(BCURDIR)),)
 283 ifeq ($(CONFIG_SPL_BUILD),)
 284 ifdef FTRACE
 285 CFLAGS += -finstrument-functions -DFTRACE
 286 endif
 287 endif
 288 endif
 289
 290 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 291 # option to the assembler.
 292 AFLAGS_DEBUG :=
 293
 294 # turn jbsr into jsr for m68k
 295 ifeq ($(ARCH),m68k)
 296 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 297 AFLAGS_DEBUG := -Wa,-gstabs,-S
 298 endif
 299 endif
 300
 301 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 302
 303 LDFLAGS += $(PLATFORM_LDFLAGS)
 304 LDFLAGS_FINAL += -Bstatic
 305
 306 LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 307 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 308 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 309 endif
 310
 311 LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
 312 ifneq ($(CONFIG_SPL_TEXT_BASE),)
 313 LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE)
 314 endif
 315
 316 # Linus' kernel sanity checking tool
 317 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
 318                   -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)
 319
 320 # Location of a usable BFD library, where we define "usable" as
 321 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 322 # - When cross-compiling: the root of the cross-environment
 323 # - Linux/ppc (native): /usr
 324 # - NetBSD/ppc (native): you lose ... (must extract these from the
 325 #   binutils build directory, plus the native and U-Boot include
 326 #   files don't like each other)
 327 #
 328 # So far, this is used only by tools/gdb/Makefile.
 329
 330 ifeq ($(HOSTOS),darwin)
 331 BFD_ROOT_DIR =          /usr/local/tools
 332 else
 333 ifeq ($(HOSTARCH),$(ARCH))
 334 # native
 335 BFD_ROOT_DIR =          /usr
 336 else
 337 #BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 338 #BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 339 BFD_ROOT_DIR =          /opt/powerpc
 340 endif
 341 endif
 342
 343 #########################################################################
 344
 345 export  HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
 346         AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 347 export  CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 348
 349 #########################################################################
 350
 351 # Allow boards to use custom optimize flags on a per dir/file basis
 352 ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
 353 ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
 354 EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
 355 ALL_CFLAGS += $(EXTRA_CPPFLAGS)
 356
 357 # The _DEP version uses the $< file target (for dependency generation)
 358 # See rules.mk
 359 EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
 360                 $(CPPFLAGS_$(BCURDIR))
 361 $(obj)%.s:      %.S
 362         $(CPP) $(ALL_AFLAGS) -o $@ $<
 363 $(obj)%.o:      %.S
 364         $(CC)  $(ALL_AFLAGS) -o $@ $< -c
 365 $(obj)%.o:      %.c
 366 ifneq ($(CHECKSRC),0)
 367         $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $<
 368 endif
 369         $(CC)  $(ALL_CFLAGS) -o $@ $< -c
 370 $(obj)%.i:      %.c
 371         $(CPP) $(ALL_CFLAGS) -o $@ $< -c
 372 $(obj)%.s:      %.c
 373         $(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
 374
 375 #########################################################################
 376
 377 # If the list of objects to link is empty, just create an empty built-in.o
 378 cmd_link_o_target = $(if $(strip $1),\
 379                       $(LD) $(LDFLAGS) -r -o $@ $1,\
 380                       rm -f $@; $(AR) rcs $@ )
 381
 382 #########################################################################