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) 67# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 68DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 69DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 70 71before-snow-leopard = $(shell if [ $(DARWIN_MAJOR_VERSION) -le 10 -a \ 72 $(DARWIN_MINOR_VERSION) -le 5 ] ; then echo "$(1)"; else echo "$(2)"; fi ;) 73 74# Snow Leopards build environment has no longer restrictions as described above 75HOSTCC = $(call before-snow-leopard, "cc", "gcc") 76HOSTCFLAGS += $(call before-snow-leopard, "-traditional-cpp") 77HOSTLDFLAGS += $(call before-snow-leopard, "-multiply_defined suppress") 78else 79HOSTCC = gcc 80endif 81 82ifeq ($(HOSTOS),cygwin) 83HOSTCFLAGS += -ansi 84endif 85 86# We build some files with extra pedantic flags to try to minimize things 87# that won't build on some weird host compiler -- though there are lots of 88# exceptions for files that aren't complaint. 89 90HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 91HOSTCFLAGS += -pedantic 92 93######################################################################### 94# 95# Option checker (courtesy linux kernel) to ensure 96# only supported compiler options are used 97# 98cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ 99 > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) 100 101# 102# Include the make variables (CC, etc...) 103# 104AS = $(CROSS_COMPILE)as 105LD = $(CROSS_COMPILE)ld 106CC = $(CROSS_COMPILE)gcc 107CPP = $(CC) -E 108AR = $(CROSS_COMPILE)ar 109NM = $(CROSS_COMPILE)nm 110LDR = $(CROSS_COMPILE)ldr 111STRIP = $(CROSS_COMPILE)strip 112OBJCOPY = $(CROSS_COMPILE)objcopy 113OBJDUMP = $(CROSS_COMPILE)objdump 114RANLIB = $(CROSS_COMPILE)RANLIB 115 116######################################################################### 117 118# Load generated board configuration 119sinclude $(OBJTREE)/include/autoconf.mk 120 121# Some architecture config.mk files need to know what CPUDIR is set to, 122# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 123# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 124# CPU-specific code. 125CPUDIR=arch/$(ARCH)/cpu/$(CPU) 126ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 127CPUDIR=arch/$(ARCH)/cpu 128endif 129 130sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 131sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 132 133ifdef SOC 134sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 135endif 136ifdef VENDOR 137BOARDDIR = $(VENDOR)/$(BOARD) 138else 139BOARDDIR = $(BOARD) 140endif 141ifdef BOARD 142sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 143endif 144 145######################################################################### 146 147ifneq (,$(findstring s,$(MAKEFLAGS))) 148ARFLAGS = cr 149else 150ARFLAGS = crv 151endif 152RELFLAGS= $(PLATFORM_RELFLAGS) 153DBGFLAGS= -g # -DDEBUG 154OPTFLAGS= -Os #-fomit-frame-pointer 155ifndef LDSCRIPT 156#LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug 157ifeq ($(CONFIG_NAND_U_BOOT),y) 158LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds 159else 160LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds 161endif 162endif 163OBJCFLAGS += --gap-fill=0xff 164 165gccincdir := $(shell $(CC) -print-file-name=include) 166 167CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 168 -D__KERNEL__ 169ifneq ($(TEXT_BASE),) 170CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE) 171endif 172 173ifneq ($(RESET_VECTOR_ADDRESS),) 174CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 175endif 176 177ifneq ($(OBJTREE),$(SRCTREE)) 178CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 179endif 180 181CPPFLAGS += -I$(TOPDIR)/include 182CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 183 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 184 185ifdef BUILD_TAG 186CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \ 187 -DBUILD_TAG='"$(BUILD_TAG)"' 188else 189CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 190endif 191 192CFLAGS += $(call cc-option,-fno-stack-protector) 193 194# avoid trigraph warnings while parsing pci.h (produced by NIOS gcc-2.9) 195# this option have to be placed behind -Wall -- that's why it is here 196ifeq ($(ARCH),nios) 197ifeq ($(findstring 2.9,$(shell $(CC) --version)),2.9) 198CFLAGS := $(CPPFLAGS) -Wall -Wno-trigraphs 199endif 200endif 201 202# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 203# option to the assembler. 204AFLAGS_DEBUG := 205 206# turn jbsr into jsr for m68k 207ifeq ($(ARCH),m68k) 208ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 209AFLAGS_DEBUG := -Wa,-gstabs,-S 210endif 211endif 212 213AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 214 215LDFLAGS += -Bstatic -T $(obj)u-boot.lds $(PLATFORM_LDFLAGS) 216ifneq ($(TEXT_BASE),) 217LDFLAGS += -Ttext $(TEXT_BASE) 218endif 219 220# Location of a usable BFD library, where we define "usable" as 221# "built for ${HOST}, supports ${TARGET}". Sensible values are 222# - When cross-compiling: the root of the cross-environment 223# - Linux/ppc (native): /usr 224# - NetBSD/ppc (native): you lose ... (must extract these from the 225# binutils build directory, plus the native and U-Boot include 226# files don't like each other) 227# 228# So far, this is used only by tools/gdb/Makefile. 229 230ifeq ($(HOSTOS),darwin) 231BFD_ROOT_DIR = /usr/local/tools 232else 233ifeq ($(HOSTARCH),$(ARCH)) 234# native 235BFD_ROOT_DIR = /usr 236else 237#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 238#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 239BFD_ROOT_DIR = /opt/powerpc 240endif 241endif 242 243######################################################################### 244 245export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 246 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 247export TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 248 249######################################################################### 250 251# Allow boards to use custom optimize flags on a per dir/file basis 252BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 253$(obj)%.s: %.S 254 $(CPP) $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \ 255 -o $@ $< 256$(obj)%.o: %.S 257 $(CC) $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) \ 258 -o $@ $< -c 259$(obj)%.o: %.c 260 $(CC) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \ 261 -o $@ $< -c 262$(obj)%.i: %.c 263 $(CPP) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \ 264 -o $@ $< -c 265$(obj)%.s: %.c 266 $(CC) $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) \ 267 -o $@ $< -c -S 268 269######################################################################### 270