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