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 26ifneq ($(OBJTREE),$(SRCTREE)) 27ifeq ($(CURDIR),$(SRCTREE)) 28dir := 29else 30dir := $(subst $(SRCTREE)/,,$(CURDIR)) 31endif 32 33obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) 34src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) 35 36$(shell mkdir -p $(obj)) 37else 38obj := 39src := 40endif 41 42# clean the slate ... 43PLATFORM_RELFLAGS = 44PLATFORM_CPPFLAGS = 45PLATFORM_LDFLAGS = 46 47######################################################################### 48 49HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \ 50 $(HOSTCPPFLAGS) 51HOSTSTRIP = strip 52 53# 54# Mac OS X / Darwin's C preprocessor is Apple specific. It 55# generates numerous errors and warnings. We want to bypass it 56# and use GNU C's cpp. To do this we pass the -traditional-cpp 57# option to the compiler. Note that the -traditional-cpp flag 58# DOES NOT have the same semantics as GNU C's flag, all it does 59# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 60# 61# Apple's linker is similar, thanks to the new 2 stage linking 62# multiple symbol definitions are treated as errors, hence the 63# -multiply_defined suppress option to turn off this error. 64# 65 66ifeq ($(HOSTOS),darwin) 67# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 68DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 69DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 70 71os_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 75HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc") 76HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp") 77HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress") 78else 79HOSTCC = gcc 80endif 81 82ifeq ($(HOSTOS),cygwin) 83HOSTCFLAGS += -ansi 84endif 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 90HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 91HOSTCFLAGS += -pedantic 92 93######################################################################### 94# 95# Option checker (courtesy linux kernel) to ensure 96# only supported compiler options are used 97# 98cc-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# 104AS = $(CROSS_COMPILE)as 105LD = $(CROSS_COMPILE)ld 106CC = $(CROSS_COMPILE)gcc 107CPP = $(CC) -E 108AR = $(CROSS_COMPILE)ar 109NM = $(CROSS_COMPILE)nm 110LDR = $(CROSS_COMPILE)ldr 111STRIP = $(CROSS_COMPILE)strip 112OBJCOPY = $(CROSS_COMPILE)objcopy 113OBJDUMP = $(CROSS_COMPILE)objdump 114RANLIB = $(CROSS_COMPILE)RANLIB 115 116######################################################################### 117 118# Load generated board configuration 119sinclude $(OBJTREE)/include/autoconf.mk 120sinclude $(OBJTREE)/include/config.mk 121 122# Some architecture config.mk files need to know what CPUDIR is set to, 123# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 124# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 125# CPU-specific code. 126CPUDIR=arch/$(ARCH)/cpu/$(CPU) 127ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 128CPUDIR=arch/$(ARCH)/cpu 129endif 130 131sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 132sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 133 134ifdef SOC 135sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 136endif 137ifdef VENDOR 138BOARDDIR = $(VENDOR)/$(BOARD) 139else 140BOARDDIR = $(BOARD) 141endif 142ifdef BOARD 143sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 144endif 145 146######################################################################### 147 148ifneq (,$(findstring s,$(MAKEFLAGS))) 149ARFLAGS = cr 150else 151ARFLAGS = crv 152endif 153RELFLAGS= $(PLATFORM_RELFLAGS) 154DBGFLAGS= -g # -DDEBUG 155OPTFLAGS= -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 161ifndef 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 167endif 168 169ifndef 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 185endif 186 187OBJCFLAGS += --gap-fill=0xff 188 189gccincdir := $(shell $(CC) -print-file-name=include) 190 191CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 192 -D__KERNEL__ 193ifneq ($(CONFIG_SYS_TEXT_BASE),) 194CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 195endif 196 197ifneq ($(RESET_VECTOR_ADDRESS),) 198CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 199endif 200 201ifneq ($(OBJTREE),$(SRCTREE)) 202CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 203endif 204 205CPPFLAGS += -I$(TOPDIR)/include 206CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 207 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 208 209ifdef BUILD_TAG 210CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 211 -DBUILD_TAG='"$(BUILD_TAG)"' 212else 213CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 214endif 215 216CFLAGS += $(call cc-option,-fno-stack-protector) 217 218# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 219# option to the assembler. 220AFLAGS_DEBUG := 221 222# turn jbsr into jsr for m68k 223ifeq ($(ARCH),m68k) 224ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 225AFLAGS_DEBUG := -Wa,-gstabs,-S 226endif 227endif 228 229AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 230 231LDFLAGS += $(PLATFORM_LDFLAGS) 232LDFLAGS_FINAL += -Bstatic 233 234LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 235ifneq ($(CONFIG_SYS_TEXT_BASE),) 236LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 237endif 238 239# Location of a usable BFD library, where we define "usable" as 240# "built for ${HOST}, supports ${TARGET}". Sensible values are 241# - When cross-compiling: the root of the cross-environment 242# - Linux/ppc (native): /usr 243# - NetBSD/ppc (native): you lose ... (must extract these from the 244# binutils build directory, plus the native and U-Boot include 245# files don't like each other) 246# 247# So far, this is used only by tools/gdb/Makefile. 248 249ifeq ($(HOSTOS),darwin) 250BFD_ROOT_DIR = /usr/local/tools 251else 252ifeq ($(HOSTARCH),$(ARCH)) 253# native 254BFD_ROOT_DIR = /usr 255else 256#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 257#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 258BFD_ROOT_DIR = /opt/powerpc 259endif 260endif 261 262######################################################################### 263 264export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 265 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 266export 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 271BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 272ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 273ALL_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 288cmd_link_o_target = $(if $(strip $1),\ 289 $(LD) $(LDFLAGS) -r -o $@ $1,\ 290 rm -f $@; $(AR) rcs $@ ) 291 292######################################################################### 293