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 152CHECK = sparse 153 154######################################################################### 155 156# Load generated board configuration 157sinclude $(OBJTREE)/include/autoconf.mk 158sinclude $(OBJTREE)/include/config.mk 159 160# Some architecture config.mk files need to know what CPUDIR is set to, 161# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 162# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 163# CPU-specific code. 164CPUDIR=arch/$(ARCH)/cpu/$(CPU) 165ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 166CPUDIR=arch/$(ARCH)/cpu 167endif 168 169sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 170sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 171 172ifdef SOC 173sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 174endif 175ifdef VENDOR 176BOARDDIR = $(VENDOR)/$(BOARD) 177else 178BOARDDIR = $(BOARD) 179endif 180ifdef BOARD 181sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 182endif 183 184######################################################################### 185 186# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 187# who are porting old code to latest mainline but not updating $(AR). 188ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 189RELFLAGS= $(PLATFORM_RELFLAGS) 190DBGFLAGS= -g # -DDEBUG 191OPTFLAGS= -Os #-fomit-frame-pointer 192 193OBJCFLAGS += --gap-fill=0xff 194 195gccincdir := $(shell $(CC) -print-file-name=include) 196 197CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 198 -D__KERNEL__ 199 200# Enable garbage collection of un-used sections for SPL 201ifeq ($(CONFIG_SPL_BUILD),y) 202CPPFLAGS += -ffunction-sections -fdata-sections 203LDFLAGS_FINAL += --gc-sections 204endif 205 206ifneq ($(CONFIG_SYS_TEXT_BASE),) 207CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 208endif 209 210ifneq ($(CONFIG_SPL_TEXT_BASE),) 211CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE) 212endif 213 214ifneq ($(CONFIG_SPL_PAD_TO),) 215CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO) 216endif 217 218ifeq ($(CONFIG_SPL_BUILD),y) 219CPPFLAGS += -DCONFIG_SPL_BUILD 220endif 221 222ifneq ($(RESET_VECTOR_ADDRESS),) 223CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 224endif 225 226ifneq ($(OBJTREE),$(SRCTREE)) 227CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 228endif 229 230CPPFLAGS += -I$(TOPDIR)/include 231CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 232 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 233 234ifdef BUILD_TAG 235CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 236 -DBUILD_TAG='"$(BUILD_TAG)"' 237else 238CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 239endif 240 241CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 242CFLAGS += $(CFLAGS_SSP) 243# Some toolchains enable security related warning flags by default, 244# but they don't make much sense in the u-boot world, so disable them. 245CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 246 $(call cc-option,-Wno-format-security) 247CFLAGS += $(CFLAGS_WARN) 248 249# Report stack usage if supported 250CFLAGS_STACK := $(call cc-option,-fstack-usage) 251CFLAGS += $(CFLAGS_STACK) 252 253# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 254# option to the assembler. 255AFLAGS_DEBUG := 256 257# turn jbsr into jsr for m68k 258ifeq ($(ARCH),m68k) 259ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 260AFLAGS_DEBUG := -Wa,-gstabs,-S 261endif 262endif 263 264AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 265 266LDFLAGS += $(PLATFORM_LDFLAGS) 267LDFLAGS_FINAL += -Bstatic 268 269LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 270ifneq ($(CONFIG_SYS_TEXT_BASE),) 271LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 272endif 273 274LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 275ifneq ($(CONFIG_SPL_TEXT_BASE),) 276LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE) 277endif 278 279# Linus' kernel sanity checking tool 280CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 281 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) 282 283# Location of a usable BFD library, where we define "usable" as 284# "built for ${HOST}, supports ${TARGET}". Sensible values are 285# - When cross-compiling: the root of the cross-environment 286# - Linux/ppc (native): /usr 287# - NetBSD/ppc (native): you lose ... (must extract these from the 288# binutils build directory, plus the native and U-Boot include 289# files don't like each other) 290# 291# So far, this is used only by tools/gdb/Makefile. 292 293ifeq ($(HOSTOS),darwin) 294BFD_ROOT_DIR = /usr/local/tools 295else 296ifeq ($(HOSTARCH),$(ARCH)) 297# native 298BFD_ROOT_DIR = /usr 299else 300#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 301#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 302BFD_ROOT_DIR = /opt/powerpc 303endif 304endif 305 306######################################################################### 307 308export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 309 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 310export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 311 312######################################################################### 313 314# Allow boards to use custom optimize flags on a per dir/file basis 315BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 316ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 317ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 318EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 319ALL_CFLAGS += $(EXTRA_CPPFLAGS) 320 321# The _DEP version uses the $< file target (for dependency generation) 322# See rules.mk 323EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 324 $(CPPFLAGS_$(BCURDIR)) 325$(obj)%.s: %.S 326 $(CPP) $(ALL_AFLAGS) -o $@ $< 327$(obj)%.o: %.S 328 $(CC) $(ALL_AFLAGS) -o $@ $< -c 329$(obj)%.o: %.c 330ifneq ($(CHECKSRC),0) 331 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< 332endif 333 $(CC) $(ALL_CFLAGS) -o $@ $< -c 334$(obj)%.i: %.c 335 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 336$(obj)%.s: %.c 337 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 338 339######################################################################### 340 341# If the list of objects to link is empty, just create an empty built-in.o 342cmd_link_o_target = $(if $(strip $1),\ 343 $(LD) $(LDFLAGS) -r -o $@ $1,\ 344 rm -f $@; $(AR) rcs $@ ) 345 346######################################################################### 347