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, gcc version (courtesy linux kernel) to ensure 108# only supported compiler options are used 109# 110CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk 111CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o 112 113-include $(CC_OPTIONS_CACHE_FILE) 114 115cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \ 116 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \ 117 > /dev/null 2>&1; then \ 118 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \ 119 echo "$(1)"; fi) 120 121ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y) 122cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2)) 123else 124cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\ 125 $(if $(call cc-option-sys,$1),$1,$2))) 126endif 127 128# cc-version 129# Usage gcc-ver := $(call cc-version) 130cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC)) 131binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS)) 132 133# 134# Include the make variables (CC, etc...) 135# 136AS = $(CROSS_COMPILE)as 137 138# Always use GNU ld 139LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \ 140 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;) 141 142CC = $(CROSS_COMPILE)gcc 143CPP = $(CC) -E 144AR = $(CROSS_COMPILE)ar 145NM = $(CROSS_COMPILE)nm 146LDR = $(CROSS_COMPILE)ldr 147STRIP = $(CROSS_COMPILE)strip 148OBJCOPY = $(CROSS_COMPILE)objcopy 149OBJDUMP = $(CROSS_COMPILE)objdump 150RANLIB = $(CROSS_COMPILE)RANLIB 151DTC = dtc 152 153######################################################################### 154 155# Load generated board configuration 156sinclude $(OBJTREE)/include/autoconf.mk 157sinclude $(OBJTREE)/include/config.mk 158 159# Some architecture config.mk files need to know what CPUDIR is set to, 160# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 161# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 162# CPU-specific code. 163CPUDIR=arch/$(ARCH)/cpu/$(CPU) 164ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 165CPUDIR=arch/$(ARCH)/cpu 166endif 167 168sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 169sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 170 171ifdef SOC 172sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 173endif 174ifdef VENDOR 175BOARDDIR = $(VENDOR)/$(BOARD) 176else 177BOARDDIR = $(BOARD) 178endif 179ifdef BOARD 180sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 181endif 182 183######################################################################### 184 185# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 186# who are porting old code to latest mainline but not updating $(AR). 187ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 188RELFLAGS= $(PLATFORM_RELFLAGS) 189DBGFLAGS= -g # -DDEBUG 190OPTFLAGS= -Os #-fomit-frame-pointer 191 192OBJCFLAGS += --gap-fill=0xff 193 194gccincdir := $(shell $(CC) -print-file-name=include) 195 196CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 197 -D__KERNEL__ 198 199# Enable garbage collection of un-used sections for SPL 200ifeq ($(CONFIG_SPL_BUILD),y) 201CPPFLAGS += -ffunction-sections -fdata-sections 202LDFLAGS_FINAL += --gc-sections 203endif 204 205ifneq ($(CONFIG_SYS_TEXT_BASE),) 206CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 207endif 208 209ifneq ($(CONFIG_SPL_TEXT_BASE),) 210CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE) 211endif 212 213ifneq ($(CONFIG_SPL_PAD_TO),) 214CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO) 215endif 216 217ifeq ($(CONFIG_SPL_BUILD),y) 218CPPFLAGS += -DCONFIG_SPL_BUILD 219endif 220 221ifneq ($(RESET_VECTOR_ADDRESS),) 222CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 223endif 224 225ifneq ($(OBJTREE),$(SRCTREE)) 226CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 227endif 228 229CPPFLAGS += -I$(TOPDIR)/include 230CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 231 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 232 233ifdef BUILD_TAG 234CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 235 -DBUILD_TAG='"$(BUILD_TAG)"' 236else 237CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 238endif 239 240CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 241CFLAGS += $(CFLAGS_SSP) 242# Some toolchains enable security related warning flags by default, 243# but they don't make much sense in the u-boot world, so disable them. 244CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 245 $(call cc-option,-Wno-format-security) 246CFLAGS += $(CFLAGS_WARN) 247 248# Report stack usage if supported 249CFLAGS_STACK := $(call cc-option,-fstack-usage) 250CFLAGS += $(CFLAGS_STACK) 251 252# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 253# option to the assembler. 254AFLAGS_DEBUG := 255 256# turn jbsr into jsr for m68k 257ifeq ($(ARCH),m68k) 258ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 259AFLAGS_DEBUG := -Wa,-gstabs,-S 260endif 261endif 262 263AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 264 265LDFLAGS += $(PLATFORM_LDFLAGS) 266LDFLAGS_FINAL += -Bstatic 267 268LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 269ifneq ($(CONFIG_SYS_TEXT_BASE),) 270LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 271endif 272 273LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 274ifneq ($(CONFIG_SPL_TEXT_BASE),) 275LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE) 276endif 277 278# Location of a usable BFD library, where we define "usable" as 279# "built for ${HOST}, supports ${TARGET}". Sensible values are 280# - When cross-compiling: the root of the cross-environment 281# - Linux/ppc (native): /usr 282# - NetBSD/ppc (native): you lose ... (must extract these from the 283# binutils build directory, plus the native and U-Boot include 284# files don't like each other) 285# 286# So far, this is used only by tools/gdb/Makefile. 287 288ifeq ($(HOSTOS),darwin) 289BFD_ROOT_DIR = /usr/local/tools 290else 291ifeq ($(HOSTARCH),$(ARCH)) 292# native 293BFD_ROOT_DIR = /usr 294else 295#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 296#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 297BFD_ROOT_DIR = /opt/powerpc 298endif 299endif 300 301######################################################################### 302 303export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 304 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 305export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 306 307######################################################################### 308 309# Allow boards to use custom optimize flags on a per dir/file basis 310BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 311ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 312ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 313EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 314ALL_CFLAGS += $(EXTRA_CPPFLAGS) 315 316# The _DEP version uses the $< file target (for dependency generation) 317# See rules.mk 318EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 319 $(CPPFLAGS_$(BCURDIR)) 320$(obj)%.s: %.S 321 $(CPP) $(ALL_AFLAGS) -o $@ $< 322$(obj)%.o: %.S 323 $(CC) $(ALL_AFLAGS) -o $@ $< -c 324$(obj)%.o: %.c 325 $(CC) $(ALL_CFLAGS) -o $@ $< -c 326$(obj)%.i: %.c 327 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 328$(obj)%.s: %.c 329 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 330 331######################################################################### 332 333# If the list of objects to link is empty, just create an empty built-in.o 334cmd_link_o_target = $(if $(strip $1),\ 335 $(LD) $(LDFLAGS) -r -o $@ $1,\ 336 rm -f $@; $(AR) rcs $@ ) 337 338######################################################################### 339