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