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 26include $(TOPDIR)/helper.mk 27 28ifeq ($(CURDIR),$(SRCTREE)) 29dir := 30else 31dir := $(subst $(SRCTREE)/,,$(CURDIR)) 32endif 33 34ifneq ($(OBJTREE),$(SRCTREE)) 35# Create object files for SPL in a separate directory 36ifeq ($(CONFIG_SPL_BUILD),y) 37obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 38else 39obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) 40endif 41src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) 42 43$(shell mkdir -p $(obj)) 44else 45# Create object files for SPL in a separate directory 46ifeq ($(CONFIG_SPL_BUILD),y) 47obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 48 49$(shell mkdir -p $(obj)) 50else 51obj := 52endif 53src := 54endif 55 56# clean the slate ... 57PLATFORM_RELFLAGS = 58PLATFORM_CPPFLAGS = 59PLATFORM_LDFLAGS = 60 61######################################################################### 62 63HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \ 64 $(HOSTCPPFLAGS) 65HOSTSTRIP = strip 66 67# 68# Mac OS X / Darwin's C preprocessor is Apple specific. It 69# generates numerous errors and warnings. We want to bypass it 70# and use GNU C's cpp. To do this we pass the -traditional-cpp 71# option to the compiler. Note that the -traditional-cpp flag 72# DOES NOT have the same semantics as GNU C's flag, all it does 73# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 74# 75# Apple's linker is similar, thanks to the new 2 stage linking 76# multiple symbol definitions are treated as errors, hence the 77# -multiply_defined suppress option to turn off this error. 78# 79 80ifeq ($(HOSTOS),darwin) 81# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 82DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 83DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 84 85os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \ 86 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;) 87 88# Snow Leopards build environment has no longer restrictions as described above 89HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc") 90HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp") 91HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress") 92else 93HOSTCC = gcc 94endif 95 96ifeq ($(HOSTOS),cygwin) 97HOSTCFLAGS += -ansi 98endif 99 100# We build some files with extra pedantic flags to try to minimize things 101# that won't build on some weird host compiler -- though there are lots of 102# exceptions for files that aren't complaint. 103 104HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 105HOSTCFLAGS += -pedantic 106 107######################################################################### 108# 109# Option checker, gcc version (courtesy linux kernel) to ensure 110# only supported compiler options are used 111# 112CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk 113CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o 114 115-include $(CC_OPTIONS_CACHE_FILE) 116 117cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \ 118 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \ 119 > /dev/null 2>&1; then \ 120 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \ 121 echo "$(1)"; fi) 122 123ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y) 124cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2)) 125else 126cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\ 127 $(if $(call cc-option-sys,$1),$1,$2))) 128endif 129 130# cc-version 131# Usage gcc-ver := $(call cc-version) 132cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC)) 133binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS)) 134 135# 136# Include the make variables (CC, etc...) 137# 138AS = $(CROSS_COMPILE)as 139 140# Always use GNU ld 141LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \ 142 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;) 143 144CC = $(CROSS_COMPILE)gcc 145CPP = $(CC) -E 146AR = $(CROSS_COMPILE)ar 147NM = $(CROSS_COMPILE)nm 148LDR = $(CROSS_COMPILE)ldr 149STRIP = $(CROSS_COMPILE)strip 150OBJCOPY = $(CROSS_COMPILE)objcopy 151OBJDUMP = $(CROSS_COMPILE)objdump 152RANLIB = $(CROSS_COMPILE)RANLIB 153DTC = dtc 154CHECK = sparse 155 156######################################################################### 157 158# Load generated board configuration 159sinclude $(OBJTREE)/include/autoconf.mk 160sinclude $(OBJTREE)/include/config.mk 161 162# Some architecture config.mk files need to know what CPUDIR is set to, 163# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 164# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 165# CPU-specific code. 166CPUDIR=arch/$(ARCH)/cpu/$(CPU) 167ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 168CPUDIR=arch/$(ARCH)/cpu 169endif 170 171sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 172sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 173 174ifdef SOC 175sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 176endif 177ifdef VENDOR 178BOARDDIR = $(VENDOR)/$(BOARD) 179else 180BOARDDIR = $(BOARD) 181endif 182ifdef BOARD 183sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 184endif 185 186######################################################################### 187 188# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 189# who are porting old code to latest mainline but not updating $(AR). 190ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 191RELFLAGS= $(PLATFORM_RELFLAGS) 192DBGFLAGS= -g # -DDEBUG 193OPTFLAGS= -Os #-fomit-frame-pointer 194 195OBJCFLAGS += --gap-fill=0xff 196 197gccincdir := $(shell $(CC) -print-file-name=include) 198 199CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 200 -D__KERNEL__ 201 202# Enable garbage collection of un-used sections for SPL 203ifeq ($(CONFIG_SPL_BUILD),y) 204CPPFLAGS += -ffunction-sections -fdata-sections 205LDFLAGS_FINAL += --gc-sections 206endif 207 208ifneq ($(CONFIG_SYS_TEXT_BASE),) 209CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 210endif 211 212ifneq ($(CONFIG_SPL_TEXT_BASE),) 213CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE) 214endif 215 216ifneq ($(CONFIG_SPL_PAD_TO),) 217CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO) 218endif 219 220ifeq ($(CONFIG_SPL_BUILD),y) 221CPPFLAGS += -DCONFIG_SPL_BUILD 222endif 223 224ifneq ($(RESET_VECTOR_ADDRESS),) 225CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 226endif 227 228ifneq ($(OBJTREE),$(SRCTREE)) 229CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 230endif 231 232CPPFLAGS += -I$(TOPDIR)/include 233CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 234 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 235 236ifdef BUILD_TAG 237CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 238 -DBUILD_TAG='"$(BUILD_TAG)"' 239else 240CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 241endif 242 243CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 244CFLAGS += $(CFLAGS_SSP) 245# Some toolchains enable security related warning flags by default, 246# but they don't make much sense in the u-boot world, so disable them. 247CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 248 $(call cc-option,-Wno-format-security) 249CFLAGS += $(CFLAGS_WARN) 250 251# Report stack usage if supported 252CFLAGS_STACK := $(call cc-option,-fstack-usage) 253CFLAGS += $(CFLAGS_STACK) 254 255# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 256# option to the assembler. 257AFLAGS_DEBUG := 258 259# turn jbsr into jsr for m68k 260ifeq ($(ARCH),m68k) 261ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 262AFLAGS_DEBUG := -Wa,-gstabs,-S 263endif 264endif 265 266AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 267 268LDFLAGS += $(PLATFORM_LDFLAGS) 269LDFLAGS_FINAL += -Bstatic 270 271LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 272ifneq ($(CONFIG_SYS_TEXT_BASE),) 273LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 274endif 275 276LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 277ifneq ($(CONFIG_SPL_TEXT_BASE),) 278LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE) 279endif 280 281# Linus' kernel sanity checking tool 282CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 283 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) 284 285# Location of a usable BFD library, where we define "usable" as 286# "built for ${HOST}, supports ${TARGET}". Sensible values are 287# - When cross-compiling: the root of the cross-environment 288# - Linux/ppc (native): /usr 289# - NetBSD/ppc (native): you lose ... (must extract these from the 290# binutils build directory, plus the native and U-Boot include 291# files don't like each other) 292# 293# So far, this is used only by tools/gdb/Makefile. 294 295ifeq ($(HOSTOS),darwin) 296BFD_ROOT_DIR = /usr/local/tools 297else 298ifeq ($(HOSTARCH),$(ARCH)) 299# native 300BFD_ROOT_DIR = /usr 301else 302#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 303#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 304BFD_ROOT_DIR = /opt/powerpc 305endif 306endif 307 308######################################################################### 309 310export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 311 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 312export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 313 314######################################################################### 315 316# Allow boards to use custom optimize flags on a per dir/file basis 317BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 318ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 319ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 320EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 321ALL_CFLAGS += $(EXTRA_CPPFLAGS) 322 323# The _DEP version uses the $< file target (for dependency generation) 324# See rules.mk 325EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 326 $(CPPFLAGS_$(BCURDIR)) 327$(obj)%.s: %.S 328 $(CPP) $(ALL_AFLAGS) -o $@ $< 329$(obj)%.o: %.S 330 $(CC) $(ALL_AFLAGS) -o $@ $< -c 331$(obj)%.o: %.c 332ifneq ($(CHECKSRC),0) 333 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< 334endif 335 $(CC) $(ALL_CFLAGS) -o $@ $< -c 336$(obj)%.i: %.c 337 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 338$(obj)%.s: %.c 339 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 340 341######################################################################### 342 343# If the list of objects to link is empty, just create an empty built-in.o 344cmd_link_o_target = $(if $(strip $1),\ 345 $(LD) $(LDFLAGS) -r -o $@ $1,\ 346 rm -f $@; $(AR) rcs $@ ) 347 348######################################################################### 349