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