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, gcc version (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# cc-version
 129# Usage gcc-ver := $(call cc-version)
 130cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC))
 131binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS))
 132
 133#
 134# Include the make variables (CC, etc...)
 135#
 136AS      = $(CROSS_COMPILE)as
 137
 138# Always use GNU ld
 139LD      = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \
 140                then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;)
 141
 142CC      = $(CROSS_COMPILE)gcc
 143CPP     = $(CC) -E
 144AR      = $(CROSS_COMPILE)ar
 145NM      = $(CROSS_COMPILE)nm
 146LDR     = $(CROSS_COMPILE)ldr
 147STRIP   = $(CROSS_COMPILE)strip
 148OBJCOPY = $(CROSS_COMPILE)objcopy
 149OBJDUMP = $(CROSS_COMPILE)objdump
 150RANLIB  = $(CROSS_COMPILE)RANLIB
 151DTC     = dtc
 152
 153#########################################################################
 154
 155# Load generated board configuration
 156sinclude $(OBJTREE)/include/autoconf.mk
 157sinclude $(OBJTREE)/include/config.mk
 158
 159# Some architecture config.mk files need to know what CPUDIR is set to,
 160# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 161# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
 162# CPU-specific code.
 163CPUDIR=arch/$(ARCH)/cpu/$(CPU)
 164ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
 165CPUDIR=arch/$(ARCH)/cpu
 166endif
 167
 168sinclude $(TOPDIR)/arch/$(ARCH)/config.mk       # include architecture dependend rules
 169sinclude $(TOPDIR)/$(CPUDIR)/config.mk          # include  CPU  specific rules
 170
 171ifdef   SOC
 172sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk   # include  SoC  specific rules
 173endif
 174ifdef   VENDOR
 175BOARDDIR = $(VENDOR)/$(BOARD)
 176else
 177BOARDDIR = $(BOARD)
 178endif
 179ifdef   BOARD
 180sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 181endif
 182
 183#########################################################################
 184
 185# We don't actually use $(ARFLAGS) anywhere anymore, so catch people
 186# who are porting old code to latest mainline but not updating $(AR).
 187ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR)
 188RELFLAGS= $(PLATFORM_RELFLAGS)
 189DBGFLAGS= -g # -DDEBUG
 190OPTFLAGS= -Os #-fomit-frame-pointer
 191
 192OBJCFLAGS += --gap-fill=0xff
 193
 194gccincdir := $(shell $(CC) -print-file-name=include)
 195
 196CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 197        -D__KERNEL__
 198
 199# Enable garbage collection of un-used sections for SPL
 200ifeq ($(CONFIG_SPL_BUILD),y)
 201CPPFLAGS += -ffunction-sections -fdata-sections
 202LDFLAGS_FINAL += --gc-sections
 203endif
 204
 205ifneq ($(CONFIG_SYS_TEXT_BASE),)
 206CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 207endif
 208
 209ifneq ($(CONFIG_SPL_TEXT_BASE),)
 210CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE)
 211endif
 212
 213ifneq ($(CONFIG_SPL_PAD_TO),)
 214CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO)
 215endif
 216
 217ifeq ($(CONFIG_SPL_BUILD),y)
 218CPPFLAGS += -DCONFIG_SPL_BUILD
 219endif
 220
 221ifneq ($(RESET_VECTOR_ADDRESS),)
 222CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
 223endif
 224
 225ifneq ($(OBJTREE),$(SRCTREE))
 226CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 227endif
 228
 229CPPFLAGS += -I$(TOPDIR)/include
 230CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 231        -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 232
 233ifdef BUILD_TAG
 234CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
 235        -DBUILD_TAG='"$(BUILD_TAG)"'
 236else
 237CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 238endif
 239
 240CFLAGS_SSP := $(call cc-option,-fno-stack-protector)
 241CFLAGS += $(CFLAGS_SSP)
 242# Some toolchains enable security related warning flags by default,
 243# but they don't make much sense in the u-boot world, so disable them.
 244CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \
 245               $(call cc-option,-Wno-format-security)
 246CFLAGS += $(CFLAGS_WARN)
 247
 248# Report stack usage if supported
 249CFLAGS_STACK := $(call cc-option,-fstack-usage)
 250CFLAGS += $(CFLAGS_STACK)
 251
 252# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 253# option to the assembler.
 254AFLAGS_DEBUG :=
 255
 256# turn jbsr into jsr for m68k
 257ifeq ($(ARCH),m68k)
 258ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 259AFLAGS_DEBUG := -Wa,-gstabs,-S
 260endif
 261endif
 262
 263AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 264
 265LDFLAGS += $(PLATFORM_LDFLAGS)
 266LDFLAGS_FINAL += -Bstatic
 267
 268LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 269ifneq ($(CONFIG_SYS_TEXT_BASE),)
 270LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 271endif
 272
 273LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL)
 274ifneq ($(CONFIG_SPL_TEXT_BASE),)
 275LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE)
 276endif
 277
 278# Location of a usable BFD library, where we define "usable" as
 279# "built for ${HOST}, supports ${TARGET}".  Sensible values are
 280# - When cross-compiling: the root of the cross-environment
 281# - Linux/ppc (native): /usr
 282# - NetBSD/ppc (native): you lose ... (must extract these from the
 283#   binutils build directory, plus the native and U-Boot include
 284#   files don't like each other)
 285#
 286# So far, this is used only by tools/gdb/Makefile.
 287
 288ifeq ($(HOSTOS),darwin)
 289BFD_ROOT_DIR =          /usr/local/tools
 290else
 291ifeq ($(HOSTARCH),$(ARCH))
 292# native
 293BFD_ROOT_DIR =          /usr
 294else
 295#BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 296#BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 297BFD_ROOT_DIR =          /opt/powerpc
 298endif
 299endif
 300
 301#########################################################################
 302
 303export  HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
 304        AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 305export  CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 306
 307#########################################################################
 308
 309# Allow boards to use custom optimize flags on a per dir/file basis
 310BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 311ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
 312ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
 313EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR))
 314ALL_CFLAGS += $(EXTRA_CPPFLAGS)
 315
 316# The _DEP version uses the $< file target (for dependency generation)
 317# See rules.mk
 318EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \
 319                $(CPPFLAGS_$(BCURDIR))
 320$(obj)%.s:      %.S
 321        $(CPP) $(ALL_AFLAGS) -o $@ $<
 322$(obj)%.o:      %.S
 323        $(CC)  $(ALL_AFLAGS) -o $@ $< -c
 324$(obj)%.o:      %.c
 325        $(CC)  $(ALL_CFLAGS) -o $@ $< -c
 326$(obj)%.i:      %.c
 327        $(CPP) $(ALL_CFLAGS) -o $@ $< -c
 328$(obj)%.s:      %.c
 329        $(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
 330
 331#########################################################################
 332
 333# If the list of objects to link is empty, just create an empty built-in.o
 334cmd_link_o_target = $(if $(strip $1),\
 335                      $(LD) $(LDFLAGS) -r -o $@ $1,\
 336                      rm -f $@; $(AR) rcs $@ )
 337
 338#########################################################################
 339