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 HOSTCC          = cc
  68 HOSTCFLAGS      += -traditional-cpp
  69 HOSTLDFLAGS     += -multiply_defined suppress
  70 else
  71 HOSTCC          = gcc
  72 endif
  73
  74 ifeq ($(HOSTOS),cygwin)
  75 HOSTCFLAGS      += -ansi
  76 endif
  77
  78 # We build some files with extra pedantic flags to try to minimize things
  79 # that won't build on some weird host compiler -- though there are lots of
  80 # exceptions for files that aren't complaint.
  81
  82 HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS))
  83 HOSTCFLAGS      += -pedantic
  84
  85 #########################################################################
  86 #
  87 # Option checker (courtesy linux kernel) to ensure
  88 # only supported compiler options are used
  89 #
  90 cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
  91                 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
  92
  93 #
  94 # Include the make variables (CC, etc...)
  95 #
  96 AS      = $(CROSS_COMPILE)as
  97 LD      = $(CROSS_COMPILE)ld
  98 CC      = $(CROSS_COMPILE)gcc
  99 CPP     = $(CC) -E
 100 AR      = $(CROSS_COMPILE)ar
 101 NM      = $(CROSS_COMPILE)nm
 102 LDR     = $(CROSS_COMPILE)ldr
 103 STRIP   = $(CROSS_COMPILE)strip
 104 OBJCOPY = $(CROSS_COMPILE)objcopy
 105 OBJDUMP = $(CROSS_COMPILE)objdump
 106 RANLIB  = $(CROSS_COMPILE)RANLIB
 107
 108 #########################################################################
 109
 110 # Load generated board configuration
 111 sinclude $(OBJTREE)/include/autoconf.mk
 112
 113 # Some architecture config.mk files need to know what CPUDIR is set to,
 114 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 115 CPUDIR=cpu/$(CPU)
 116
 117 sinclude $(TOPDIR)/arch/$(ARCH)/config.mk       # include architecture dependend rules
 118 sinclude $(TOPDIR)/$(CPUDIR)/config.mk          # include  CPU  specific rules
 119
 120 ifdef   SOC
 121 sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk   # include  SoC  specific rules
 122 endif
 123 ifdef   VENDOR
 124 BOARDDIR = $(VENDOR)/$(BOARD)
 125 else
 126 BOARDDIR = $(BOARD)
 127 endif
 128 ifdef   BOARD
 129 sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk  # include board specific rules
 130 endif
 131
 132 #########################################################################
 133
 134 ifneq (,$(findstring s,$(MAKEFLAGS)))
 135 ARFLAGS = cr
 136 else
 137 ARFLAGS = crv
 138 endif
 139 RELFLAGS= $(PLATFORM_RELFLAGS)
 140 DBGFLAGS= -g # -DDEBUG
 141 OPTFLAGS= -Os #-fomit-frame-pointer
 142 ifndef LDSCRIPT
 143 #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
 144 ifeq ($(CONFIG_NAND_U_BOOT),y)
 145 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
 146 else
 147 LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
 148 endif
 149 endif
 150 OBJCFLAGS += --gap-fill=0xff
 151
 152 gccincdir := $(shell $(CC) -print-file-name=include)
 153
 154 CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS)         \
 155         -D__KERNEL__
 156 ifneq ($(TEXT_BASE),)
 157 CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
 158 endif
 159
 160 ifneq ($(RESET_VECTOR_ADDRESS),)
 161 CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS)
 162 endif
 163
 164 ifneq ($(OBJTREE),$(SRCTREE))
 165 CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
 166 endif
 167
 168 CPPFLAGS += -I$(TOPDIR)/include
 169 CPPFLAGS += -fno-builtin -ffreestanding -nostdinc       \
 170         -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
 171
 172 ifdef BUILD_TAG
 173 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
 174         -DBUILD_TAG='"$(BUILD_TAG)"'
 175 else
 176 CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
 177 endif
 178
 179 CFLAGS += $(call cc-option,-fno-stack-protector)
 180
 181 # avoid trigraph warnings while parsing pci.h (produced by NIOS gcc-2.9)
 182 # this option have to be placed behind -Wall -- that's why it is here
 183 ifeq ($(ARCH),nios)
 184 ifeq ($(findstring 2.9,$(shell $(CC) --version)),2.9)
 185 CFLAGS := $(CPPFLAGS) -Wall -Wno-trigraphs
 186 endif
 187 endif
 188
 189 # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
 190 # option to the assembler.
 191 AFLAGS_DEBUG :=
 192
 193 # turn jbsr into jsr for m68k
 194 ifeq ($(ARCH),m68k)
 195 ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
 196 AFLAGS_DEBUG := -Wa,-gstabs,-S
 197 endif
 198 endif
 199
 200 AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
 201
 202 LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS)
 203 ifneq ($(TEXT_BASE),)
 204 LDFLAGS += -Ttext $(TEXT_BASE)
 205 endif
 206
 207 # Location of a usable BFD library, where we define "usable" as
 208 # "built for ${HOST}, supports ${TARGET}".  Sensible values are
 209 # - When cross-compiling: the root of the cross-environment
 210 # - Linux/ppc (native): /usr
 211 # - NetBSD/ppc (native): you lose ... (must extract these from the
 212 #   binutils build directory, plus the native and U-Boot include
 213 #   files don't like each other)
 214 #
 215 # So far, this is used only by tools/gdb/Makefile.
 216
 217 ifeq ($(HOSTOS),darwin)
 218 BFD_ROOT_DIR =          /usr/local/tools
 219 else
 220 ifeq ($(HOSTARCH),$(ARCH))
 221 # native
 222 BFD_ROOT_DIR =          /usr
 223 else
 224 #BFD_ROOT_DIR =         /LinuxPPC/CDK           # Linux/i386
 225 #BFD_ROOT_DIR =         /usr/pkg/cross          # NetBSD/i386
 226 BFD_ROOT_DIR =          /opt/powerpc
 227 endif
 228 endif
 229
 230 #########################################################################
 231
 232 export  HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \
 233         AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE
 234 export  TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
 235
 236 #########################################################################
 237
 238 # Allow boards to use custom optimize flags on a per dir/file basis
 239 BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%))
 240 $(obj)%.s:      %.S
 241         $(CPP) $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \
 242                 -o $@ $<
 243 $(obj)%.o:      %.S
 244         $(CC)  $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \
 245                 -o $@ $< -c
 246 $(obj)%.o:      %.c
 247         $(CC)  $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
 248                 -o $@ $< -c
 249 $(obj)%.i:      %.c
 250         $(CPP) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
 251                 -o $@ $< -c
 252 $(obj)%.s:      %.c
 253         $(CC)  $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \
 254                 -o $@ $< -c -S
 255
 256 #########################################################################