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 26ifneq ($(OBJTREE),$(SRCTREE)) 27ifeq ($(CURDIR),$(SRCTREE)) 28dir := 29else 30dir := $(subst $(SRCTREE)/,,$(CURDIR)) 31endif 32 33obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) 34src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) 35 36$(shell mkdir -p $(obj)) 37else 38obj := 39src := 40endif 41 42# clean the slate ... 43PLATFORM_RELFLAGS = 44PLATFORM_CPPFLAGS = 45PLATFORM_LDFLAGS = 46 47######################################################################### 48 49HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \ 50 $(HOSTCPPFLAGS) 51HOSTSTRIP = strip 52 53# 54# Mac OS X / Darwin's C preprocessor is Apple specific. It 55# generates numerous errors and warnings. We want to bypass it 56# and use GNU C's cpp. To do this we pass the -traditional-cpp 57# option to the compiler. Note that the -traditional-cpp flag 58# DOES NOT have the same semantics as GNU C's flag, all it does 59# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 60# 61# Apple's linker is similar, thanks to the new 2 stage linking 62# multiple symbol definitions are treated as errors, hence the 63# -multiply_defined suppress option to turn off this error. 64# 65 66ifeq ($(HOSTOS),darwin) 67HOSTCC = cc 68HOSTCFLAGS += -traditional-cpp 69HOSTLDFLAGS += -multiply_defined suppress 70else 71HOSTCC = gcc 72endif 73 74ifeq ($(HOSTOS),cygwin) 75HOSTCFLAGS += -ansi 76endif 77 78# We build some files with extra pedantic flags to try to minimize things 79# that won't build on some weird host compiler -- though there are lots of 80# exceptions for files that aren't complaint. 81 82HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 83HOSTCFLAGS += -pedantic 84 85######################################################################### 86# 87# Option checker (courtesy linux kernel) to ensure 88# only supported compiler options are used 89# 90cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ 91 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) 92 93# 94# Include the make variables (CC, etc...) 95# 96AS = $(CROSS_COMPILE)as 97LD = $(CROSS_COMPILE)ld 98CC = $(CROSS_COMPILE)gcc 99CPP = $(CC) -E 100AR = $(CROSS_COMPILE)ar 101NM = $(CROSS_COMPILE)nm 102LDR = $(CROSS_COMPILE)ldr 103STRIP = $(CROSS_COMPILE)strip 104OBJCOPY = $(CROSS_COMPILE)objcopy 105OBJDUMP = $(CROSS_COMPILE)objdump 106RANLIB = $(CROSS_COMPILE)RANLIB 107 108######################################################################### 109 110# Load generated board configuration 111sinclude $(OBJTREE)/include/autoconf.mk 112 113# Some architecture config.mk files need to know what CPUDIR is set to, 114# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 115# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 116# CPU-specific code. 117CPUDIR=arch/$(ARCH)/cpu/$(CPU) 118ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 119CPUDIR=arch/$(ARCH)/cpu 120endif 121 122sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 123sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 124 125ifdef SOC 126sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 127endif 128ifdef VENDOR 129BOARDDIR = $(VENDOR)/$(BOARD) 130else 131BOARDDIR = $(BOARD) 132endif 133ifdef BOARD 134sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 135endif 136 137######################################################################### 138 139ifneq (,$(findstring s,$(MAKEFLAGS))) 140ARFLAGS = cr 141else 142ARFLAGS = crv 143endif 144RELFLAGS= $(PLATFORM_RELFLAGS) 145DBGFLAGS= -g # -DDEBUG 146OPTFLAGS= -Os #-fomit-frame-pointer 147ifndef LDSCRIPT 148#LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug 149ifeq ($(CONFIG_NAND_U_BOOT),y) 150LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds 151else 152LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds 153endif 154endif 155OBJCFLAGS += --gap-fill=0xff 156 157gccincdir := $(shell $(CC) -print-file-name=include) 158 159CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 160 -D__KERNEL__ 161ifneq ($(TEXT_BASE),) 162CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) 163endif 164 165ifneq ($(RESET_VECTOR_ADDRESS),) 166CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 167endif 168 169ifneq ($(OBJTREE),$(SRCTREE)) 170CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 171endif 172 173CPPFLAGS += -I$(TOPDIR)/include 174CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 175 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 176 177ifdef BUILD_TAG 178CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 179 -DBUILD_TAG='"$(BUILD_TAG)"' 180else 181CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 182endif 183 184CFLAGS += $(call cc-option,-fno-stack-protector) 185 186# avoid trigraph warnings while parsing pci.h (produced by NIOS gcc-2.9) 187# this option have to be placed behind -Wall -- that's why it is here 188ifeq ($(ARCH),nios) 189ifeq ($(findstring 2.9,$(shell $(CC) --version)),2.9) 190CFLAGS := $(CPPFLAGS) -Wall -Wno-trigraphs 191endif 192endif 193 194# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 195# option to the assembler. 196AFLAGS_DEBUG := 197 198# turn jbsr into jsr for m68k 199ifeq ($(ARCH),m68k) 200ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 201AFLAGS_DEBUG := -Wa,-gstabs,-S 202endif 203endif 204 205AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 206 207LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS) 208ifneq ($(TEXT_BASE),) 209LDFLAGS += -Ttext $(TEXT_BASE) 210endif 211 212# Location of a usable BFD library, where we define "usable" as 213# "built for ${HOST}, supports ${TARGET}". Sensible values are 214# - When cross-compiling: the root of the cross-environment 215# - Linux/ppc (native): /usr 216# - NetBSD/ppc (native): you lose ... (must extract these from the 217# binutils build directory, plus the native and U-Boot include 218# files don't like each other) 219# 220# So far, this is used only by tools/gdb/Makefile. 221 222ifeq ($(HOSTOS),darwin) 223BFD_ROOT_DIR = /usr/local/tools 224else 225ifeq ($(HOSTARCH),$(ARCH)) 226# native 227BFD_ROOT_DIR = /usr 228else 229#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 230#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 231BFD_ROOT_DIR = /opt/powerpc 232endif 233endif 234 235######################################################################### 236 237export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 238 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 239export TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 240 241######################################################################### 242 243# Allow boards to use custom optimize flags on a per dir/file basis 244BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 245$(obj)%.s: %.S 246 $(CPP) $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \ 247 -o $@ $< 248$(obj)%.o: %.S 249 $(CC) $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \ 250 -o $@ $< -c 251$(obj)%.o: %.c 252 $(CC) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \ 253 -o $@ $< -c 254$(obj)%.i: %.c 255 $(CPP) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \ 256 -o $@ $< -c 257$(obj)%.s: %.c 258 $(CC) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \ 259 -o $@ $< -c -S 260 261######################################################################### 262