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 := $(OBJTREE)/include/generated/cc_options.mk 111 112$(if $(wildcard $(CC_OPTIONS_CACHE_FILE)),,\ 113 $(shell mkdir -p $(dir $(CC_OPTIONS_CACHE_FILE)))) 114 115-include $(CC_OPTIONS_CACHE_FILE) 116 117cc-option-sys = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ 118 > /dev/null 2>&1; then \ 119 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \ 120 echo "$(1)"; fi) 121 122ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y) 123cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2)) 124else 125cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\ 126 $(if $(call cc-option-sys,$1),$1,$2))) 127endif 128 129# 130# Include the make variables (CC, etc...) 131# 132AS = $(CROSS_COMPILE)as 133LD = $(CROSS_COMPILE)ld 134CC = $(CROSS_COMPILE)gcc 135CPP = $(CC) -E 136AR = $(CROSS_COMPILE)ar 137NM = $(CROSS_COMPILE)nm 138LDR = $(CROSS_COMPILE)ldr 139STRIP = $(CROSS_COMPILE)strip 140OBJCOPY = $(CROSS_COMPILE)objcopy 141OBJDUMP = $(CROSS_COMPILE)objdump 142RANLIB = $(CROSS_COMPILE)RANLIB 143DTC = dtc 144 145######################################################################### 146 147# Load generated board configuration 148sinclude $(OBJTREE)/include/autoconf.mk 149sinclude $(OBJTREE)/include/config.mk 150 151# Some architecture config.mk files need to know what CPUDIR is set to, 152# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 153# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 154# CPU-specific code. 155CPUDIR=arch/$(ARCH)/cpu/$(CPU) 156ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 157CPUDIR=arch/$(ARCH)/cpu 158endif 159 160sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 161sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 162 163ifdef SOC 164sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 165endif 166ifdef VENDOR 167BOARDDIR = $(VENDOR)/$(BOARD) 168else 169BOARDDIR = $(BOARD) 170endif 171ifdef BOARD 172sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 173endif 174 175######################################################################### 176 177# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 178# who are porting old code to latest mainline but not updating $(AR). 179ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 180RELFLAGS= $(PLATFORM_RELFLAGS) 181DBGFLAGS= -g # -DDEBUG 182OPTFLAGS= -Os #-fomit-frame-pointer 183 184OBJCFLAGS += --gap-fill=0xff 185 186gccincdir := $(shell $(CC) -print-file-name=include) 187 188CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 189 -D__KERNEL__ 190 191# Enable garbage collection of un-used sections for SPL 192ifeq ($(CONFIG_SPL_BUILD),y) 193CPPFLAGS += -ffunction-sections -fdata-sections 194LDFLAGS_FINAL += --gc-sections 195endif 196 197ifneq ($(CONFIG_SYS_TEXT_BASE),) 198CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 199endif 200 201ifneq ($(CONFIG_SPL_TEXT_BASE),) 202CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE) 203endif 204 205ifeq ($(CONFIG_SPL_BUILD),y) 206CPPFLAGS += -DCONFIG_SPL_BUILD 207endif 208 209ifneq ($(RESET_VECTOR_ADDRESS),) 210CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 211endif 212 213ifneq ($(OBJTREE),$(SRCTREE)) 214CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 215endif 216 217CPPFLAGS += -I$(TOPDIR)/include 218CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 219 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 220 221ifdef BUILD_TAG 222CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 223 -DBUILD_TAG='"$(BUILD_TAG)"' 224else 225CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 226endif 227 228CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 229CFLAGS += $(CFLAGS_SSP) 230# Some toolchains enable security related warning flags by default, 231# but they don't make much sense in the u-boot world, so disable them. 232CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 233 $(call cc-option,-Wno-format-security) 234CFLAGS += $(CFLAGS_WARN) 235 236# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 237# option to the assembler. 238AFLAGS_DEBUG := 239 240# turn jbsr into jsr for m68k 241ifeq ($(ARCH),m68k) 242ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 243AFLAGS_DEBUG := -Wa,-gstabs,-S 244endif 245endif 246 247AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 248 249LDFLAGS += $(PLATFORM_LDFLAGS) 250LDFLAGS_FINAL += -Bstatic 251 252LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 253ifneq ($(CONFIG_SYS_TEXT_BASE),) 254LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 255endif 256 257LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 258ifneq ($(CONFIG_SPL_TEXT_BASE),) 259LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE) 260endif 261 262# Location of a usable BFD library, where we define "usable" as 263# "built for ${HOST}, supports ${TARGET}". Sensible values are 264# - When cross-compiling: the root of the cross-environment 265# - Linux/ppc (native): /usr 266# - NetBSD/ppc (native): you lose ... (must extract these from the 267# binutils build directory, plus the native and U-Boot include 268# files don't like each other) 269# 270# So far, this is used only by tools/gdb/Makefile. 271 272ifeq ($(HOSTOS),darwin) 273BFD_ROOT_DIR = /usr/local/tools 274else 275ifeq ($(HOSTARCH),$(ARCH)) 276# native 277BFD_ROOT_DIR = /usr 278else 279#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 280#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 281BFD_ROOT_DIR = /opt/powerpc 282endif 283endif 284 285######################################################################### 286 287export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 288 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 289export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 290 291######################################################################### 292 293# Allow boards to use custom optimize flags on a per dir/file basis 294BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 295ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 296ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 297EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 298ALL_CFLAGS += $(EXTRA_CPPFLAGS) 299 300# The _DEP version uses the $< file target (for dependency generation) 301# See rules.mk 302EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 303 $(CPPFLAGS_$(BCURDIR)) 304$(obj)%.s: %.S 305 $(CPP) $(ALL_AFLAGS) -o $@ $< 306$(obj)%.o: %.S 307 $(CC) $(ALL_AFLAGS) -o $@ $< -c 308$(obj)%.o: %.c 309 $(CC) $(ALL_CFLAGS) -o $@ $< -c 310$(obj)%.i: %.c 311 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 312$(obj)%.s: %.c 313 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 314 315######################################################################### 316 317# If the list of objects to link is empty, just create an empty built-in.o 318cmd_link_o_target = $(if $(strip $1),\ 319 $(LD) $(LDFLAGS) -r -o $@ $1,\ 320 rm -f $@; $(AR) rcs $@ ) 321 322######################################################################### 323