1# 2# (C) Copyright 2000-2013 3# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4# 5# SPDX-License-Identifier: GPL-2.0+ 6# 7######################################################################### 8 9# Set shell to bash if possible, otherwise fall back to sh 10SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 11 else if [ -x /bin/bash ]; then echo /bin/bash; \ 12 else echo sh; fi; fi) 13 14export SHELL 15 16ifeq ($(CURDIR),$(SRCTREE)) 17dir := 18else 19dir := $(subst $(SRCTREE)/,,$(CURDIR)) 20endif 21 22ifneq ($(OBJTREE),$(SRCTREE)) 23# Create object files for SPL in a separate directory 24ifeq ($(CONFIG_SPL_BUILD),y) 25obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 26else 27obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) 28endif 29src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) 30 31$(shell mkdir -p $(obj)) 32else 33# Create object files for SPL in a separate directory 34ifeq ($(CONFIG_SPL_BUILD),y) 35obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 36 37$(shell mkdir -p $(obj)) 38else 39obj := 40endif 41src := 42endif 43 44# clean the slate ... 45PLATFORM_RELFLAGS = 46PLATFORM_CPPFLAGS = 47PLATFORM_LDFLAGS = 48 49######################################################################### 50 51HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \ 52 $(HOSTCPPFLAGS) 53HOSTSTRIP = strip 54 55# 56# Mac OS X / Darwin's C preprocessor is Apple specific. It 57# generates numerous errors and warnings. We want to bypass it 58# and use GNU C's cpp. To do this we pass the -traditional-cpp 59# option to the compiler. Note that the -traditional-cpp flag 60# DOES NOT have the same semantics as GNU C's flag, all it does 61# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 62# 63# Apple's linker is similar, thanks to the new 2 stage linking 64# multiple symbol definitions are treated as errors, hence the 65# -multiply_defined suppress option to turn off this error. 66# 67 68ifeq ($(HOSTOS),darwin) 69# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 70DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 71DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 72 73os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \ 74 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;) 75 76# Snow Leopards build environment has no longer restrictions as described above 77HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc") 78HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp") 79HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress") 80else 81HOSTCC = gcc 82endif 83 84ifeq ($(HOSTOS),cygwin) 85HOSTCFLAGS += -ansi 86endif 87 88# We build some files with extra pedantic flags to try to minimize things 89# that won't build on some weird host compiler -- though there are lots of 90# exceptions for files that aren't complaint. 91 92HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 93HOSTCFLAGS += -pedantic 94 95######################################################################### 96# 97# Option checker, gcc version (courtesy linux kernel) to ensure 98# only supported compiler options are used 99# 100CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk 101CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o 102 103-include $(CC_OPTIONS_CACHE_FILE) 104 105cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \ 106 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \ 107 > /dev/null 2>&1; then \ 108 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \ 109 echo "$(1)"; fi) 110 111ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y) 112cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2)) 113else 114cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\ 115 $(if $(call cc-option-sys,$1),$1,$2))) 116endif 117 118# cc-version 119# Usage gcc-ver := $(call cc-version) 120cc-version = $(shell $(SHELL) $(SRCTREE)/tools/gcc-version.sh $(CC)) 121binutils-version = $(shell $(SHELL) $(SRCTREE)/tools/binutils-version.sh $(AS)) 122dtc-version = $(shell $(SHELL) $(SRCTREE)/tools/dtc-version.sh $(DTC)) 123 124# 125# Include the make variables (CC, etc...) 126# 127AS = $(CROSS_COMPILE)as 128 129# Always use GNU ld 130LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \ 131 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;) 132 133CC = $(CROSS_COMPILE)gcc 134CPP = $(CC) -E 135AR = $(CROSS_COMPILE)ar 136NM = $(CROSS_COMPILE)nm 137LDR = $(CROSS_COMPILE)ldr 138STRIP = $(CROSS_COMPILE)strip 139OBJCOPY = $(CROSS_COMPILE)objcopy 140OBJDUMP = $(CROSS_COMPILE)objdump 141RANLIB = $(CROSS_COMPILE)RANLIB 142DTC = dtc 143CHECK = sparse 144 145######################################################################### 146 147# Load generated board configuration 148sinclude $(OBJTREE)/include/autoconf.mk 149sinclude $(OBJTREE)/include/config.mk 150 151# Some architecture config.mk files need to know what CPUDIR is set to, 152# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 153# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 154# CPU-specific code. 155CPUDIR=arch/$(ARCH)/cpu/$(CPU) 156ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 157CPUDIR=arch/$(ARCH)/cpu 158endif 159 160sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 161sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 162 163ifdef SOC 164sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 165endif 166ifdef VENDOR 167BOARDDIR = $(VENDOR)/$(BOARD) 168else 169BOARDDIR = $(BOARD) 170endif 171ifdef BOARD 172sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 173endif 174 175######################################################################### 176 177# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 178# who are porting old code to latest mainline but not updating $(AR). 179ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 180RELFLAGS= $(PLATFORM_RELFLAGS) 181DBGFLAGS= -g # -DDEBUG 182OPTFLAGS= -Os #-fomit-frame-pointer 183 184OBJCFLAGS += --gap-fill=0xff 185 186gccincdir := $(shell $(CC) -print-file-name=include) 187 188CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 189 -D__KERNEL__ 190 191# Enable garbage collection of un-used sections for SPL 192ifeq ($(CONFIG_SPL_BUILD),y) 193CPPFLAGS += -ffunction-sections -fdata-sections 194LDFLAGS_FINAL += --gc-sections 195endif 196 197# TODO(sjg@chromium.org): Is this correct on Mac OS? 198ifdef CONFIG_FIT_SIGNATURE 199HOSTLIBS += -lssl -lcrypto 200 201# This affects include/image.h, but including the board config file 202# is tricky, so manually define this options here. 203HOSTCFLAGS += -DCONFIG_FIT_SIGNATURE 204endif 205 206ifneq ($(CONFIG_SYS_TEXT_BASE),) 207CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 208endif 209 210ifneq ($(CONFIG_SPL_TEXT_BASE),) 211CPPFLAGS += -DCONFIG_SPL_TEXT_BASE=$(CONFIG_SPL_TEXT_BASE) 212endif 213 214ifneq ($(CONFIG_SPL_PAD_TO),) 215CPPFLAGS += -DCONFIG_SPL_PAD_TO=$(CONFIG_SPL_PAD_TO) 216endif 217 218ifneq ($(CONFIG_UBOOT_PAD_TO),) 219CPPFLAGS += -DCONFIG_UBOOT_PAD_TO=$(CONFIG_UBOOT_PAD_TO) 220endif 221 222ifeq ($(CONFIG_SPL_BUILD),y) 223CPPFLAGS += -DCONFIG_SPL_BUILD 224endif 225 226# Does this architecture support generic board init? 227ifeq ($(__HAVE_ARCH_GENERIC_BOARD),) 228ifneq ($(CONFIG_SYS_GENERIC_BOARD),) 229CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \ 230Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file) 231endif 232endif 233 234ifneq ($(RESET_VECTOR_ADDRESS),) 235CPPFLAGS += -DRESET_VECTOR_ADDRESS=$(RESET_VECTOR_ADDRESS) 236endif 237 238ifneq ($(OBJTREE),$(SRCTREE)) 239CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include 240endif 241 242CPPFLAGS += -I$(TOPDIR)/include 243CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 244 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 245 246CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 247 248ifdef BUILD_TAG 249CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"' 250endif 251 252CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 253CFLAGS += $(CFLAGS_SSP) 254# Some toolchains enable security related warning flags by default, 255# but they don't make much sense in the u-boot world, so disable them. 256CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 257 $(call cc-option,-Wno-format-security) 258CFLAGS += $(CFLAGS_WARN) 259 260# Report stack usage if supported 261CFLAGS_STACK := $(call cc-option,-fstack-usage) 262CFLAGS += $(CFLAGS_STACK) 263 264BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 265 266ifeq ($(findstring examples/,$(BCURDIR)),) 267ifeq ($(CONFIG_SPL_BUILD),) 268ifdef FTRACE 269CFLAGS += -finstrument-functions -DFTRACE 270endif 271endif 272endif 273 274# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 275# option to the assembler. 276AFLAGS_DEBUG := 277 278# turn jbsr into jsr for m68k 279ifeq ($(ARCH),m68k) 280ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 281AFLAGS_DEBUG := -Wa,-gstabs,-S 282endif 283endif 284 285AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 286 287LDFLAGS += $(PLATFORM_LDFLAGS) 288LDFLAGS_FINAL += -Bstatic 289 290LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 291ifneq ($(CONFIG_SYS_TEXT_BASE),) 292LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 293endif 294 295LDFLAGS_u-boot-spl += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 296ifneq ($(CONFIG_SPL_TEXT_BASE),) 297LDFLAGS_u-boot-spl += -Ttext $(CONFIG_SPL_TEXT_BASE) 298endif 299 300# Linus' kernel sanity checking tool 301CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 302 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) 303 304# Location of a usable BFD library, where we define "usable" as 305# "built for ${HOST}, supports ${TARGET}". Sensible values are 306# - When cross-compiling: the root of the cross-environment 307# - Linux/ppc (native): /usr 308# - NetBSD/ppc (native): you lose ... (must extract these from the 309# binutils build directory, plus the native and U-Boot include 310# files don't like each other) 311# 312# So far, this is used only by tools/gdb/Makefile. 313 314ifeq ($(HOSTOS),darwin) 315BFD_ROOT_DIR = /usr/local/tools 316else 317ifeq ($(HOSTARCH),$(ARCH)) 318# native 319BFD_ROOT_DIR = /usr 320else 321#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 322#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 323BFD_ROOT_DIR = /opt/powerpc 324endif 325endif 326 327######################################################################### 328 329export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 330 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 331export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 332 333######################################################################### 334 335# Allow boards to use custom optimize flags on a per dir/file basis 336ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 337ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 338EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 339ALL_CFLAGS += $(EXTRA_CPPFLAGS) 340 341# The _DEP version uses the $< file target (for dependency generation) 342# See rules.mk 343EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 344 $(CPPFLAGS_$(BCURDIR)) 345$(obj)%.s: %.S 346 $(CPP) $(ALL_AFLAGS) -o $@ $< 347$(obj)%.o: %.S 348 $(CC) $(ALL_AFLAGS) -o $@ $< -c 349$(obj)%.o: %.c 350ifneq ($(CHECKSRC),0) 351 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< 352endif 353 $(CC) $(ALL_CFLAGS) -o $@ $< -c 354$(obj)%.i: %.c 355 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 356$(obj)%.s: %.c 357 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 358 359######################################################################### 360 361# If the list of objects to link is empty, just create an empty built-in.o 362cmd_link_o_target = $(if $(strip $1),\ 363 $(LD) $(LDFLAGS) -r -o $@ $1,\ 364 rm -f $@; $(AR) rcs $@ ) 365 366######################################################################### 367