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# Set shell to bash if possible, otherwise fall back to sh 27SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 28 else if [ -x /bin/bash ]; then echo /bin/bash; \ 29 else echo sh; fi; fi) 30 31export SHELL 32 33ifeq ($(CURDIR),$(SRCTREE)) 34dir := 35else 36dir := $(subst $(SRCTREE)/,,$(CURDIR)) 37endif 38 39ifneq ($(OBJTREE),$(SRCTREE)) 40# Create object files for SPL in a separate directory 41ifeq ($(CONFIG_SPL_BUILD),y) 42obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 43else 44obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) 45endif 46src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) 47 48$(shell mkdir -p $(obj)) 49else 50# Create object files for SPL in a separate directory 51ifeq ($(CONFIG_SPL_BUILD),y) 52obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 53 54$(shell mkdir -p $(obj)) 55else 56obj := 57endif 58src := 59endif 60 61# clean the slate ... 62PLATFORM_RELFLAGS = 63PLATFORM_CPPFLAGS = 64PLATFORM_LDFLAGS = 65 66######################################################################### 67 68HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \ 69 $(HOSTCPPFLAGS) 70HOSTSTRIP = strip 71 72# 73# Mac OS X / Darwin's C preprocessor is Apple specific. It 74# generates numerous errors and warnings. We want to bypass it 75# and use GNU C's cpp. To do this we pass the -traditional-cpp 76# option to the compiler. Note that the -traditional-cpp flag 77# DOES NOT have the same semantics as GNU C's flag, all it does 78# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 79# 80# Apple's linker is similar, thanks to the new 2 stage linking 81# multiple symbol definitions are treated as errors, hence the 82# -multiply_defined suppress option to turn off this error. 83# 84 85ifeq ($(HOSTOS),darwin) 86# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 87DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 88DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 89 90os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \ 91 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;) 92 93# Snow Leopards build environment has no longer restrictions as described above 94HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc") 95HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp") 96HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress") 97else 98HOSTCC = gcc 99endif 100 101ifeq ($(HOSTOS),cygwin) 102HOSTCFLAGS += -ansi 103endif 104 105# We build some files with extra pedantic flags to try to minimize things 106# that won't build on some weird host compiler -- though there are lots of 107# exceptions for files that aren't complaint. 108 109HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 110HOSTCFLAGS += -pedantic 111 112######################################################################### 113# 114# Option checker, gcc version (courtesy linux kernel) to ensure 115# only supported compiler options are used 116# 117CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk 118CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o 119 120-include $(CC_OPTIONS_CACHE_FILE) 121 122cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \ 123 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \ 124 > /dev/null 2>&1; then \ 125 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \ 126 echo "$(1)"; fi) 127 128ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y) 129cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2)) 130else 131cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\ 132 $(if $(call cc-option-sys,$1),$1,$2))) 133endif 134 135# cc-version 136# Usage gcc-ver := $(call cc-version) 137cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC)) 138binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS)) 139 140# 141# Include the make variables (CC, etc...) 142# 143AS = $(CROSS_COMPILE)as 144 145# Always use GNU ld 146LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \ 147 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;) 148 149CC = $(CROSS_COMPILE)gcc 150CPP = $(CC) -E 151AR = $(CROSS_COMPILE)ar 152NM = $(CROSS_COMPILE)nm 153LDR = $(CROSS_COMPILE)ldr 154STRIP = $(CROSS_COMPILE)strip 155OBJCOPY = $(CROSS_COMPILE)objcopy 156OBJDUMP = $(CROSS_COMPILE)objdump 157RANLIB = $(CROSS_COMPILE)RANLIB 158DTC = dtc 159CHECK = sparse 160 161######################################################################### 162 163# Load generated board configuration 164sinclude $(OBJTREE)/include/autoconf.mk 165sinclude $(OBJTREE)/include/config.mk 166 167# Some architecture config.mk files need to know what CPUDIR is set to, 168# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 169# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 170# CPU-specific code. 171CPUDIR=arch/$(ARCH)/cpu/$(CPU) 172ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 173CPUDIR=arch/$(ARCH)/cpu 174endif 175 176sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 177sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 178 179ifdef SOC 180sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 181endif 182ifdef VENDOR 183BOARDDIR = $(VENDOR)/$(BOARD) 184else 185BOARDDIR = $(BOARD) 186endif 187ifdef BOARD 188sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 189endif 190 191######################################################################### 192 193# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 194# who are porting old code to latest mainline but not updating $(AR). 195ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 196RELFLAGS= $(PLATFORM_RELFLAGS) 197DBGFLAGS= -g # -DDEBUG 198OPTFLAGS= -Os #-fomit-frame-pointer 199 200OBJCFLAGS += --gap-fill=0xff 201 202gccincdir := $(shell $(CC) -print-file-name=include) 203 204CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 205 -D__KERNEL__ 206 207# Enable garbage collection of un-used sections for SPL 208ifeq ($(CONFIG_SPL_BUILD),y) 209CPPFLAGS += -ffunction-sections -fdata-sections 210LDFLAGS_FINAL += --gc-sections 211endif 212 213ifneq ($(CONFIG_SYS_TEXT_BASE),) 214CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 215endif 216 217ifneq ($(CONFIG_SPL_TEXT_BASE),) 218CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE) 219endif 220 221ifneq ($(CONFIG_SPL_PAD_TO),) 222CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO) 223endif 224 225ifneq ($(CONFIG_UBOOT_PAD_TO),) 226CPPFLAGS += -DCONFIG_UBOOT_PAD_TO=$(CONFIG_UBOOT_PAD_TO) 227endif 228 229ifeq ($(CONFIG_SPL_BUILD),y) 230CPPFLAGS += -DCONFIG_SPL_BUILD 231endif 232 233# Does this architecture support generic board init? 234ifeq ($(__HAVE_ARCH_GENERIC_BOARD),) 235ifneq ($(CONFIG_SYS_GENERIC_BOARD),) 236CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \ 237Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file) 238endif 239endif 240 241ifneq ($(RESET_VECTOR_ADDRESS),) 242CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 243endif 244 245ifneq ($(OBJTREE),$(SRCTREE)) 246CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 247endif 248 249CPPFLAGS += -I$(TOPDIR)/include 250CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 251 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 252 253CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 254 255ifdef BUILD_TAG 256CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"' 257endif 258 259CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 260CFLAGS += $(CFLAGS_SSP) 261# Some toolchains enable security related warning flags by default, 262# but they don't make much sense in the u-boot world, so disable them. 263CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 264 $(call cc-option,-Wno-format-security) 265CFLAGS += $(CFLAGS_WARN) 266 267# Report stack usage if supported 268CFLAGS_STACK := $(call cc-option,-fstack-usage) 269CFLAGS += $(CFLAGS_STACK) 270 271# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 272# option to the assembler. 273AFLAGS_DEBUG := 274 275# turn jbsr into jsr for m68k 276ifeq ($(ARCH),m68k) 277ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 278AFLAGS_DEBUG := -Wa,-gstabs,-S 279endif 280endif 281 282AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 283 284LDFLAGS += $(PLATFORM_LDFLAGS) 285LDFLAGS_FINAL += -Bstatic 286 287LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 288ifneq ($(CONFIG_SYS_TEXT_BASE),) 289LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 290endif 291 292LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 293ifneq ($(CONFIG_SPL_TEXT_BASE),) 294LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE) 295endif 296 297# Linus' kernel sanity checking tool 298CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 299 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) 300 301# Location of a usable BFD library, where we define "usable" as 302# "built for ${HOST}, supports ${TARGET}". Sensible values are 303# - When cross-compiling: the root of the cross-environment 304# - Linux/ppc (native): /usr 305# - NetBSD/ppc (native): you lose ... (must extract these from the 306# binutils build directory, plus the native and U-Boot include 307# files don't like each other) 308# 309# So far, this is used only by tools/gdb/Makefile. 310 311ifeq ($(HOSTOS),darwin) 312BFD_ROOT_DIR = /usr/local/tools 313else 314ifeq ($(HOSTARCH),$(ARCH)) 315# native 316BFD_ROOT_DIR = /usr 317else 318#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 319#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 320BFD_ROOT_DIR = /opt/powerpc 321endif 322endif 323 324######################################################################### 325 326export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 327 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 328export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 329 330######################################################################### 331 332# Allow boards to use custom optimize flags on a per dir/file basis 333BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 334ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 335ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 336EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 337ALL_CFLAGS += $(EXTRA_CPPFLAGS) 338 339# The _DEP version uses the $< file target (for dependency generation) 340# See rules.mk 341EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 342 $(CPPFLAGS_$(BCURDIR)) 343$(obj)%.s: %.S 344 $(CPP) $(ALL_AFLAGS) -o $@ $< 345$(obj)%.o: %.S 346 $(CC) $(ALL_AFLAGS) -o $@ $< -c 347$(obj)%.o: %.c 348ifneq ($(CHECKSRC),0) 349 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< 350endif 351 $(CC) $(ALL_CFLAGS) -o $@ $< -c 352$(obj)%.i: %.c 353 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 354$(obj)%.s: %.c 355 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 356 357######################################################################### 358 359# If the list of objects to link is empty, just create an empty built-in.o 360cmd_link_o_target = $(if $(strip $1),\ 361 $(LD) $(LDFLAGS) -r -o $@ $1,\ 362 rm -f $@; $(AR) rcs $@ ) 363 364######################################################################### 365