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
  26 ifneq ($(OBJTREE),$(SRCTREE))
  27 ifeq ($(CURDIR),$(SRCTREE))
  28 dir :=
  29 else
  30 dir := $(subst $(SRCTREE)/,,$(CURDIR))
  31 endif
  32
  33 obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  34 src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  35
  36 $(shell mkdir -p $(obj))
  37 else
  38 obj :=
  39 src :=
  40 endif
  41
  42 # clean the slate ...
  43 PLATFORM_RELFLAGS =
  44 PLATFORM_CPPFLAGS =
  45 PLATFORM_LDFLAGS =
  46
  47 #########################################################################
  48
  49 HOSTCFLAGS      = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
  50                   $(HOSTCPPFLAGS)
  51 HOSTSTRIP       = strip
  52
  53 #
  54 # Mac OS X / Darwin's C preprocessor is Apple specific.  It
  55 # generates numerous errors and warnings.  We want to bypass it
  56 # and use GNU C's cpp.  To do this we pass the -traditional-cpp
  57 # option to the compiler.  Note that the -traditional-cpp flag
  58 # DOES NOT have the same semantics as GNU C's flag, all it does
  59 # is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
  60 #
  61 # Apple's linker is similar, thanks to the new 2 stage linking
  62 # multiple symbol definitions are treated as errors, hence the
  63 # -multiply_defined suppress option to turn off this error.
  64 #
  65
  66 ifeq ($(HOSTOS),darwin)
  67 # get major and minor product version (e.g. '10' and '6' for Snow Leopard)
  68 DARWIN_MAJOR_VERSION    = $(shell sw_vers -productVersion | cut -f 1 -d '.')
  69 DARWIN_MINOR_VERSION    = $(shell sw_vers -productVersion | cut -f 2 -d '.')
  70
  71 os_x_before     = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
  72         $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)
  73
  74 # Snow Leopards build environment has no longer restrictions as described above
  75 HOSTCC           = $(call os_x_before, 10, 5, "cc", "gcc")
  76 HOSTCFLAGS      += $(call os_x_before, 10, 4, "-traditional-cpp")
  77 HOSTLDFLAGS     += $(call os_x_before, 10, 5, "-multiply_defined suppress")
  78 else
  79 HOSTCC          = gcc
  80 endif
  81
  82 ifeq ($(HOSTOS),cygwin)
  83 HOSTCFLAGS      += -ansi
  84 endif
  85
  86 # We build some files with extra pedantic flags to try to minimize things
  87 # that won't build on some weird host compiler -- though there are lots of
  88 # exceptions for files that aren't complaint.
  89
  90 HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
  91 HOSTCFLAGS      += -pedantic
  92
  93 #########################################################################
  94 #
  95 # Option checker (courtesy linux kernel) to ensure
  96 # only supported compiler options are used
  97 #
  98 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
  99                 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 100
 101 #
 102 # Include the make variables (CC, etc...)
 103 #
 104 AS      = $(CROSS_COMPILE)as
 105 LD      = $(CROSS_COMPILE)ld
 106 CC      = $(CROSS_COMPILE)gcc
 107 CPP     = $(CC) -E
 108 AR      = $(CROSS_COMPILE)ar
 109 NM      = $(CROSS_COMPILE)nm
 110 LDR     = $(CROSS_COMPILE)ldr
 111 STRIP   = $(CROSS_COMPILE)strip
 112 OBJCOPY = $(CROSS_COMPILE)objcopy
 113 OBJDUMP = $(CROSS_COMPILE)objdump
 114 RANLIB  = $(CROSS_COMPILE)RANLIB
 115
 116 #########################################################################
 117
 118 # Load generated board configuration
 119 sinclude $(OBJTREE)/include/autoconf.mk
 120 sinclude $(OBJTREE)/include/config.mk
 121
 122 # Some architecture config.mk files need to know what CPUDIR is set to,
 123 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 124 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains
 125 # CPU-specific code.
 126 CPUDIR=arch/$(ARCH)/cpu/$(CPU)
 127 ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR)))
 128 CPUDIR=arch/$(ARCH)/cpu
 129 endif
 130
 131 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk       # include architecture dependend rules
 132 sinclude $(TOPDIR)/$(CPUDIR)/config.mk          # include  CPU  specific rules
 133
 134 ifdef   SOC
 135 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk   # include  SoC  specific rules
 136 endif
 137 ifdef   VENDOR
 138 BOARDDIR = $(VENDOR)/$(BOARD)
 139 else
 140 BOARDDIR = $(BOARD)
 141 endif
 142 ifdef   BOARD
 143 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 144 endif
 145
 146 #########################################################################
 147
 148 ifneq (,$(findstring s,$(MAKEFLAGS)))
 149 ARFLAGS = cr
 150 else
 151 ARFLAGS = crv
 152 endif
 153 RELFLAGS= $(PLATFORM_RELFLAGS)
 154 DBGFLAGS= -g # -DDEBUG
 155 OPTFLAGS= -Os #-fomit-frame-pointer
 156
 157 # If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
 158 # that (or fail if absent).  Otherwise, search for a linker script in a
 159 # standard location.
 160
 161 ifndef LDSCRIPT
 162         #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
 163         ifdef CONFIG_SYS_LDSCRIPT
 164                 # need to strip off double quotes
 165                 LDSCRIPT := $(subst ",,$(CONFIG_SYS_LDSCRIPT))
 166         endif
 167 endif
 168
 169 ifndef LDSCRIPT
 170         ifeq ($(CONFIG_NAND_U_BOOT),y)
 171                 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
 172                 ifeq ($(wildcard $(LDSCRIPT)),)
 173                         LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
 174                 endif
 175         endif
 176         ifeq ($(wildcard $(LDSCRIPT)),)
 177                 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
 178         endif
 179         ifeq ($(wildcard $(LDSCRIPT)),)
 180                 LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot.lds
 181         endif
 182         ifeq ($(wildcard $(LDSCRIPT)),)
 183 $(error could not find linker script)
 184         endif
 185 endif
 186
 187 OBJCFLAGS += --gap-fill=0xff
 188
 189 gccincdir := $(shell $(CC) -print-file-name=include)
 190
 191 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 192         -D__KERNEL__
 193 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 194 CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 195 endif
 196
 197 ifneq ($(RESET_VECTOR_ADDRESS),)
 198 CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
 199 endif
 200
 201 ifneq ($(OBJTREE),$(SRCTREE))
 202 CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 203 endif
 204
 205 CPPFLAGS += -I$(TOPDIR)/include
 206 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 207         -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 208
 209 ifdef BUILD_TAG
 210 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
 211         -DBUILD_TAG='"$(BUILD_TAG)"'
 212 else
 213 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 214 endif
 215
 216 CFLAGS += $(call cc-option,-fno-stack-protector)
 217
 218 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 219 # option to the assembler.
 220 AFLAGS_DEBUG :=
 221
 222 # turn jbsr into jsr for m68k
 223 ifeq ($(ARCH),m68k)
 224 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 225 AFLAGS_DEBUG := -Wa,-gstabs,-S
 226 endif
 227 endif
 228
 229 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 230
 231 LDFLAGS += $(PLATFORM_LDFLAGS)
 232 LDFLAGS_FINAL += -Bstatic
 233
 234 LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL)
 235 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 236 LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
 237 endif
 238
 239 # Location of a usable BFD library, where we define "usable" as
 240 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 241 # - When cross-compiling: the root of the cross-environment
 242 # - Linux/ppc (native): /usr
 243 # - NetBSD/ppc (native): you lose ... (must extract these from the
 244 #   binutils build directory, plus the native and U-Boot include
 245 #   files don't like each other)
 246 #
 247 # So far, this is used only by tools/gdb/Makefile.
 248
 249 ifeq ($(HOSTOS),darwin)
 250 BFD_ROOT_DIR =          /usr/local/tools
 251 else
 252 ifeq ($(HOSTARCH),$(ARCH))
 253 # native
 254 BFD_ROOT_DIR =          /usr
 255 else
 256 #BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 257 #BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 258 BFD_ROOT_DIR =          /opt/powerpc
 259 endif
 260 endif
 261
 262 #########################################################################
 263
 264 export  HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
 265         AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 266 export  CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 267
 268 #########################################################################
 269
 270 # Allow boards to use custom optimize flags on a per dir/file basis
 271 BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 272 ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR))
 273 ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR))
 274 $(obj)%.s:      %.S
 275         $(CPP) $(ALL_AFLAGS) -o $@ $<
 276 $(obj)%.o:      %.S
 277         $(CC)  $(ALL_AFLAGS) -o $@ $< -c
 278 $(obj)%.o:      %.c
 279         $(CC)  $(ALL_CFLAGS) -o $@ $< -c
 280 $(obj)%.i:      %.c
 281         $(CPP) $(ALL_CFLAGS) -o $@ $< -c
 282 $(obj)%.s:      %.c
 283         $(CC)  $(ALL_CFLAGS) -o $@ $< -c -S
 284
 285 #########################################################################
 286
 287 # If the list of objects to link is empty, just create an empty built-in.o
 288 cmd_link_o_target = $(if $(strip $1),\
 289                       $(LD) $(LDFLAGS) -r -o $@ $1,\
 290                       rm -f $@; $(AR) rcs $@ )
 291
 292 #########################################################################