LXR uboot/config.mk

   1#
   2# (C) Copyright 2000-2006
   3# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4#
   5# See file CREDITS for list of people who contributed to this
   6# project.
   7#
   8# This program is free software; you can redistribute it and/or
   9# modify it under the terms of the GNU General Public License as
  10# published by the Free Software Foundation; either version 2 of
  11# the License, or (at your option) any later version.
  12#
  13# This program is distributed in the hope that it will be useful,
  14# but WITHOUT ANY WARRANTY; without even the implied warranty of
  15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16# GNU General Public License for more details.
  17#
  18# You should have received a copy of the GNU General Public License
  19# along with this program; if not, write to the Free Software
  20# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21# MA 02111-1307 USA
  22#
  23
  24#########################################################################
  25
  26ifeq ($(CURDIR),$(SRCTREE))
  27dir :=
  28else
  29dir := $(subst $(SRCTREE)/,,$(CURDIR))
  30endif
  31
  32ifneq ($(OBJTREE),$(SRCTREE))
  33# Create object files for SPL in a separate directory
  34ifeq ($(CONFIG_SPL_BUILD),y)
  35obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
  36else
  37obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  38endif
  39src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  40
  41$(shell mkdir -p $(obj))
  42else
  43# Create object files for SPL in a separate directory
  44ifeq ($(CONFIG_SPL_BUILD),y)
  45obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/)
  46
  47$(shell mkdir -p $(obj))
  48else
  49obj :=
  50endif
  51src :=
  52endif
  53
  54# clean the slate ...
  55PLATFORM_RELFLAGS =
  56PLATFORM_CPPFLAGS =
  57PLATFORM_LDFLAGS =
  58
  59#########################################################################
  60
  61HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
  62                  $(HOSTCPPFLAGS)
  63HOSTSTRIP       = strip
  64
  65#
  66# Mac OS X / Darwin's C preprocessor is Apple specific.  It
  67# generates numerous errors and warnings.  We want to bypass it
  68# and use GNU C's cpp.  To do this we pass the -traditional-cpp
  69# option to the compiler.  Note that the -traditional-cpp flag
  70# DOES NOT have the same semantics as GNU C's flag, all it does
  71# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
  72#
  73# Apple's linker is similar, thanks to the new 2 stage linking
  74# multiple symbol definitions are treated as errors, hence the
  75# -multiply_defined suppress option to turn off this error.
  76#
  77
  78ifeq ($(HOSTOS),darwin)
  79# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
  80DARWIN_MAJOR_VERSION    = $(shell sw_vers -productVersion | cut -f 1 -d '.')
  81DARWIN_MINOR_VERSION    = $(shell sw_vers -productVersion | cut -f 2 -d '.')
  82
  83os_x_before     = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
  84        $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
  85
  86# Snow Leopards build environment has no longer restrictions as described above
  87HOSTCC           = $(call os_x_before, 10, 5, "cc", "gcc")
  88HOSTCFLAGS      += $(call os_x_before, 10, 4, "-traditional-cpp")
  89HOSTLDFLAGS     += $(call os_x_before, 10, 5, "-multiply_defined suppress")
  90else
  91HOSTCC          = gcc
  92endif
  93
  94ifeq ($(HOSTOS),cygwin)
  95HOSTCFLAGS      += -ansi
  96endif
  97
  98# We build some files with extra pedantic flags to try to minimize things
  99# that won't build on some weird host compiler -- though there are lots of
 100# exceptions for files that aren't complaint.
 101
 102HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
 103HOSTCFLAGS      += -pedantic
 104
 105#########################################################################
 106#
 107# Option checker (courtesy linux kernel) to ensure
 108# only supported compiler options are used
 109#
 110CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk
 111CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o
 112
 113-include $(CC_OPTIONS_CACHE_FILE)
 114
 115cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \
 116                if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \
 117                > /dev/null 2>&1; then \
 118                echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \
 119                echo "$(1)"; fi)
 120
 121ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y)
 122cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2))
 123else
 124cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\
 125                $(if $(call cc-option-sys,$1),$1,$2)))
 126endif
 127
 128#
 129# Include the make variables (CC, etc...)
 130#
 131AS      = $(CROSS_COMPILE)as
 132LD      = $(CROSS_COMPILE)ld
 133CC      = $(CROSS_COMPILE)gcc
 134CPP     = $(CC) -E
 135AR      = $(CROSS_COMPILE)ar
 136NM      = $(CROSS_COMPILE)nm
 137LDR     = $(CROSS_COMPILE)ldr
 138STRIP   = $(CROSS_COMPILE)strip
 139OBJCOPY = $(CROSS_COMPILE)objcopy
 140OBJDUMP = $(CROSS_COMPILE)objdump
 141RANLIB  = $(CROSS_COMPILE)RANLIB
 142DTC     = dtc
 143
 144#########################################################################
 145
 146# Load generated board configuration
 147sinclude $(OBJTREE)/include/autoconf.mk
 148sinclude $(OBJTREE)/include/config.mk
 149
 150# Some architecture config.mk files need to know what CPUDIR is set to,
 151# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 152# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
 153# CPU-specific code.
 154CPUDIR=arch/$(ARCH)/cpu/$(CPU)
 155ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
 156CPUDIR=arch/$(ARCH)/cpu
 157endif
 158
 159sinclude $(TOPDIR)/arch/$(ARCH)/config.mk       # include architecture dependend rules
 160sinclude $(TOPDIR)/$(CPUDIR)/config.mk          # include  CPU  specific rules
 161
 162ifdef   SOC
 163sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk   # include  SoC  specific rules
 164endif
 165ifdef   VENDOR
 166BOARDDIR = $(VENDOR)/$(BOARD)
 167else
 168BOARDDIR = $(BOARD)
 169endif
 170ifdef   BOARD
 171sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 172endif
 173
 174#########################################################################
 175
 176# We don't actually use $(ARFLAGS) anywhere anymore, so catch people
 177# who are porting old code to latest mainline but not updating $(AR).
 178ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
 179RELFLAGS= $(PLATFORM_RELFLAGS)
 180DBGFLAGS= -g # -DDEBUG
 181OPTFLAGS= -Os #-fomit-frame-pointer
 182
 183OBJCFLAGS += --gap-fill=0xff
 184
 185gccincdir := $(shell $(CC) -print-file-name=include)
 186
 187CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 188        -D__KERNEL__
 189
 190# Enable garbage collection of un-used sections for SPL
 191ifeq ($(CONFIG_SPL_BUILD),y)
 192CPPFLAGS += -ffunction-sections -fdata-sections
 193LDFLAGS_FINAL += --gc-sections
 194endif
 195
 196ifneq ($(CONFIG_SYS_TEXT_BASE),)
 197CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 198endif
 199
 200ifneq ($(CONFIG_SPL_TEXT_BASE),)
 201CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE)
 202endif
 203
 204ifeq ($(CONFIG_SPL_BUILD),y)
 205CPPFLAGS += -DCONFIG_SPL_BUILD
 206endif
 207
 208ifneq ($(RESET_VECTOR_ADDRESS),)
 209CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
 210endif
 211
 212ifneq ($(OBJTREE),$(SRCTREE))
 213CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 214endif
 215
 216CPPFLAGS += -I$(TOPDIR)/include
 217CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 218        -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 219
 220ifdef BUILD_TAG
 221CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
 222        -DBUILD_TAG='"$(BUILD_TAG)"'
 223else
 224CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 225endif
 226
 227CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
 228CFLAGS += $(CFLAGS_SSP)
 229# Some toolchains enable security related warning flags by default,
 230# but they don't make much sense in the u-boot world, so disable them.
 231CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
 232               $(call cc-option,-Wno-format-security)
 233CFLAGS += $(CFLAGS_WARN)
 234
 235# Report stack usage if supported
 236CFLAGS_STACK := $(call cc-option,-fstack-usage)
 237CFLAGS += $(CFLAGS_STACK)
 238
 239# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 240# option to the assembler.
 241AFLAGS_DEBUG :=
 242
 243# turn jbsr into jsr for m68k
 244ifeq ($(ARCH),m68k)
 245ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 246AFLAGS_DEBUG := -Wa,-gstabs,-S
 247endif
 248endif
 249
 250AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 251
 252LDFLAGS += $(PLATFORM_LDFLAGS)
 253LDFLAGS_FINAL += -Bstatic
 254
 255LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 256ifneq ($(CONFIG_SYS_TEXT_BASE),)
 257LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 258endif
 259
 260LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
 261ifneq ($(CONFIG_SPL_TEXT_BASE),)
 262LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
 263endif
 264
 265# Location of a usable BFD library, where we define "usable" as
 266# "built for ${HOST}, supports ${TARGET}".  Sensible values are
 267# - When cross-compiling: the root of the cross-environment
 268# - Linux/ppc (native): /usr
 269# - NetBSD/ppc (native): you lose ... (must extract these from the
 270#   binutils build directory, plus the native and U-Boot include
 271#   files don't like each other)
 272#
 273# So far, this is used only by tools/gdb/Makefile.
 274
 275ifeq ($(HOSTOS),darwin)
 276BFD_ROOT_DIR =          /usr/local/tools
 277else
 278ifeq ($(HOSTARCH),$(ARCH))
 279# native
 280BFD_ROOT_DIR =          /usr
 281else
 282#BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 283#BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 284BFD_ROOT_DIR =          /opt/powerpc
 285endif
 286endif
 287
 288#########################################################################
 289
 290export  HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
 291        AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 292export  CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 293
 294#########################################################################
 295
 296# Allow boards to use custom optimize flags on a per dir/file basis
 297BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 298ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
 299ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
 300EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
 301ALL_CFLAGS += $(EXTRA_CPPFLAGS)
 302
 303# The _DEP version uses the $< file target (for dependency generation)
 304# See rules.mk
 305EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
 306                $(CPPFLAGS_$(BCURDIR))
 307$(obj)%.s:      %.S
 308        $(CPP) $(ALL_AFLAGS) -o $@ $<
 309$(obj)%.o:      %.S
 310        $(CC)  $(ALL_AFLAGS) -o $@ $< -c
 311$(obj)%.o:      %.c
 312        $(CC)  $(ALL_CFLAGS) -o $@ $< -c
 313$(obj)%.i:      %.c
 314        $(CPP) $(ALL_CFLAGS) -o $@ $< -c
 315$(obj)%.s:      %.c
 316        $(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
 317
 318#########################################################################
 319
 320# If the list of objects to link is empty, just create an empty built-in.o
 321cmd_link_o_target = $(if $(strip $1),\
 322                      $(LD) $(LDFLAGS) -r -o $@ $1,\
 323                      rm -f $@; $(AR) rcs $@ )
 324
 325#########################################################################
 326