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 ($(CONFIG_SPL_BUILD),y) 25ifeq ($(CONFIG_TPL_BUILD),y) 26obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/) 27else 28obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 29endif 30else 31obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/) 32endif 33src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/) 34 35$(shell mkdir -p $(obj)) 36else 37# Create object files for SPL in a separate directory 38ifeq ($(CONFIG_SPL_BUILD),y) 39ifeq ($(CONFIG_TPL_BUILD),y) 40obj := $(if $(dir),$(TPLTREE)/$(dir)/,$(TPLTREE)/) 41else 42obj := $(if $(dir),$(SPLTREE)/$(dir)/,$(SPLTREE)/) 43 44endif 45$(shell mkdir -p $(obj)) 46else 47obj := 48endif 49src := 50endif 51 52# clean the slate ... 53PLATFORM_RELFLAGS = 54PLATFORM_CPPFLAGS = 55PLATFORM_LDFLAGS = 56 57######################################################################### 58 59HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \ 60 $(HOSTCPPFLAGS) 61HOSTSTRIP = strip 62 63# 64# Mac OS X / Darwin's C preprocessor is Apple specific. It 65# generates numerous errors and warnings. We want to bypass it 66# and use GNU C's cpp. To do this we pass the -traditional-cpp 67# option to the compiler. Note that the -traditional-cpp flag 68# DOES NOT have the same semantics as GNU C's flag, all it does 69# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 70# 71# Apple's linker is similar, thanks to the new 2 stage linking 72# multiple symbol definitions are treated as errors, hence the 73# -multiply_defined suppress option to turn off this error. 74# 75 76ifeq ($(HOSTOS),darwin) 77# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 78DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 79DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 80 81os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \ 82 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;) 83 84# Snow Leopards build environment has no longer restrictions as described above 85HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc") 86HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp") 87HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress") 88else 89HOSTCC = gcc 90endif 91 92ifeq ($(HOSTOS),cygwin) 93HOSTCFLAGS += -ansi 94endif 95 96# We build some files with extra pedantic flags to try to minimize things 97# that won't build on some weird host compiler -- though there are lots of 98# exceptions for files that aren't complaint. 99 100HOSTCFLAGS_NOPED = $(filter-out -pedantic,$(HOSTCFLAGS)) 101HOSTCFLAGS += -pedantic 102 103######################################################################### 104# 105# Option checker, gcc version (courtesy linux kernel) to ensure 106# only supported compiler options are used 107# 108CC_OPTIONS_CACHE_FILE := $(OBJTREE)/include/generated/cc_options.mk 109CC_TEST_OFILE := $(OBJTREE)/include/generated/cc_test_file.o 110 111-include $(CC_OPTIONS_CACHE_FILE) 112 113cc-option-sys = $(shell mkdir -p $(dir $(CC_TEST_OFILE)); \ 114 if $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o $(CC_TEST_OFILE) \ 115 > /dev/null 2>&1; then \ 116 echo 'CC_OPTIONS += $(strip $1)' >> $(CC_OPTIONS_CACHE_FILE); \ 117 echo "$(1)"; fi) 118 119ifeq ($(CONFIG_CC_OPT_CACHE_DISABLE),y) 120cc-option = $(strip $(if $(call cc-option-sys,$1),$1,$2)) 121else 122cc-option = $(strip $(if $(findstring $1,$(CC_OPTIONS)),$1,\ 123 $(if $(call cc-option-sys,$1),$1,$2))) 124endif 125 126# cc-version 127# Usage gcc-ver := $(call cc-version) 128cc-version = $(shell $(SHELL) $(SRCTREE)/scripts/gcc-version.sh $(CC)) 129binutils-version = $(shell $(SHELL) $(SRCTREE)/scripts/binutils-version.sh $(AS)) 130dtc-version = $(shell $(SHELL) $(SRCTREE)/scripts/dtc-version.sh $(DTC)) 131 132# 133# Include the make variables (CC, etc...) 134# 135AS = $(CROSS_COMPILE)as 136 137# Always use GNU ld 138LD = $(shell if $(CROSS_COMPILE)ld.bfd -v > /dev/null 2>&1; \ 139 then echo "$(CROSS_COMPILE)ld.bfd"; else echo "$(CROSS_COMPILE)ld"; fi;) 140 141CC = $(CROSS_COMPILE)gcc 142CPP = $(CC) -E 143AR = $(CROSS_COMPILE)ar 144NM = $(CROSS_COMPILE)nm 145LDR = $(CROSS_COMPILE)ldr 146STRIP = $(CROSS_COMPILE)strip 147OBJCOPY = $(CROSS_COMPILE)objcopy 148OBJDUMP = $(CROSS_COMPILE)objdump 149RANLIB = $(CROSS_COMPILE)RANLIB 150DTC = dtc 151CHECK = sparse 152 153######################################################################### 154 155# Load generated board configuration 156ifeq ($(CONFIG_TPL_BUILD),y) 157# Include TPL autoconf 158sinclude $(OBJTREE)/include/tpl-autoconf.mk 159else 160ifeq ($(CONFIG_SPL_BUILD),y) 161# Include SPL autoconf 162sinclude $(OBJTREE)/include/spl-autoconf.mk 163else 164# Include normal autoconf 165sinclude $(OBJTREE)/include/autoconf.mk 166endif 167endif 168sinclude $(OBJTREE)/include/config.mk 169 170# Some architecture config.mk files need to know what CPUDIR is set to, 171# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 172# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 173# CPU-specific code. 174CPUDIR=arch/$(ARCH)/cpu/$(CPU) 175ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 176CPUDIR=arch/$(ARCH)/cpu 177endif 178 179sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 180sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 181 182ifdef SOC 183sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 184endif 185ifdef VENDOR 186BOARDDIR = $(VENDOR)/$(BOARD) 187else 188BOARDDIR = $(BOARD) 189endif 190ifdef BOARD 191sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 192endif 193 194######################################################################### 195 196# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 197# who are porting old code to latest mainline but not updating $(AR). 198ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 199RELFLAGS= $(PLATFORM_RELFLAGS) 200DBGFLAGS= -g # -DDEBUG 201OPTFLAGS= -Os #-fomit-frame-pointer 202 203OBJCFLAGS += --gap-fill=0xff 204 205gccincdir := $(shell $(CC) -print-file-name=include) 206 207CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 208 -D__KERNEL__ 209 210# Enable garbage collection of un-used sections for SPL 211ifeq ($(CONFIG_SPL_BUILD),y) 212CPPFLAGS += -ffunction-sections -fdata-sections 213LDFLAGS_FINAL += --gc-sections 214endif 215 216# TODO(sjg@chromium.org): Is this correct on Mac OS? 217 218# MXSImage needs LibSSL 219ifneq ($(CONFIG_MX23)$(CONFIG_MX28),) 220HOSTLIBS += -lssl -lcrypto 221# Add CONFIG_MXS into host CFLAGS, so we can check whether or not register 222# the mxsimage support within tools/mxsimage.c . 223HOSTCFLAGS += -DCONFIG_MXS 224endif 225 226ifdef CONFIG_FIT_SIGNATURE 227HOSTLIBS += -lssl -lcrypto 228 229# This affects include/image.h, but including the board config file 230# is tricky, so manually define this options here. 231HOSTCFLAGS += -DCONFIG_FIT_SIGNATURE 232endif 233 234ifneq ($(CONFIG_SYS_TEXT_BASE),) 235CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 236endif 237 238ifeq ($(CONFIG_SPL_BUILD),y) 239CPPFLAGS += -DCONFIG_SPL_BUILD 240ifeq ($(CONFIG_TPL_BUILD),y) 241CPPFLAGS += -DCONFIG_TPL_BUILD 242endif 243endif 244 245# Does this architecture support generic board init? 246ifeq ($(__HAVE_ARCH_GENERIC_BOARD),) 247ifneq ($(CONFIG_SYS_GENERIC_BOARD),) 248CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \ 249Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file) 250endif 251endif 252 253# Sandbox needs the base flags and includes, so keep them around 254BASE_CPPFLAGS := $(CPPFLAGS) 255 256ifneq ($(OBJTREE),$(SRCTREE)) 257BASE_INCLUDE_DIRS := $(OBJTREE)/include 258endif 259 260BASE_INCLUDE_DIRS += $(TOPDIR)/include $(SRCTREE)/arch/$(ARCH)/include 261 262CPPFLAGS += $(patsubst %, -I%, $(BASE_INCLUDE_DIRS)) 263CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 264 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 265 266CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 267 268ifdef BUILD_TAG 269CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"' 270endif 271 272CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 273CFLAGS += $(CFLAGS_SSP) 274# Some toolchains enable security related warning flags by default, 275# but they don't make much sense in the u-boot world, so disable them. 276CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 277 $(call cc-option,-Wno-format-security) 278CFLAGS += $(CFLAGS_WARN) 279 280# Report stack usage if supported 281CFLAGS_STACK := $(call cc-option,-fstack-usage) 282CFLAGS += $(CFLAGS_STACK) 283 284BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 285 286ifeq ($(findstring examples/,$(BCURDIR)),) 287ifeq ($(CONFIG_SPL_BUILD),) 288ifdef FTRACE 289CFLAGS += -finstrument-functions -DFTRACE 290endif 291endif 292endif 293 294# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 295# option to the assembler. 296AFLAGS_DEBUG := 297 298# turn jbsr into jsr for m68k 299ifeq ($(ARCH),m68k) 300ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 301AFLAGS_DEBUG := -Wa,-gstabs,-S 302endif 303endif 304 305AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 306 307LDFLAGS += $(PLATFORM_LDFLAGS) 308LDFLAGS_FINAL += -Bstatic 309 310LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 311ifneq ($(CONFIG_SYS_TEXT_BASE),) 312LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 313endif 314 315LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 316ifneq ($(CONFIG_SPL_TEXT_BASE),) 317LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE) 318endif 319 320# Linus' kernel sanity checking tool 321CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 322 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) 323 324# Location of a usable BFD library, where we define "usable" as 325# "built for ${HOST}, supports ${TARGET}". Sensible values are 326# - When cross-compiling: the root of the cross-environment 327# - Linux/ppc (native): /usr 328# - NetBSD/ppc (native): you lose ... (must extract these from the 329# binutils build directory, plus the native and U-Boot include 330# files don't like each other) 331# 332# So far, this is used only by tools/gdb/Makefile. 333 334ifeq ($(HOSTOS),darwin) 335BFD_ROOT_DIR = /usr/local/tools 336else 337ifeq ($(HOSTARCH),$(ARCH)) 338# native 339BFD_ROOT_DIR = /usr 340else 341#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 342#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 343BFD_ROOT_DIR = /opt/powerpc 344endif 345endif 346 347######################################################################### 348 349export HOSTCC HOSTCFLAGS HOSTLDFLAGS PEDCFLAGS HOSTSTRIP CROSS_COMPILE \ 350 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 351export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 352 353######################################################################### 354 355# Allow boards to use custom optimize flags on a per dir/file basis 356ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 357ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 358EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 359ALL_CFLAGS += $(EXTRA_CPPFLAGS) 360 361# The _DEP version uses the $< file target (for dependency generation) 362# See rules.mk 363EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 364 $(CPPFLAGS_$(BCURDIR)) 365$(obj)%.s: %.S 366 $(CPP) $(ALL_AFLAGS) -o $@ $< 367$(obj)%.o: %.S 368 $(CC) $(ALL_AFLAGS) -o $@ $< -c 369$(obj)%.o: %.c 370ifneq ($(CHECKSRC),0) 371 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< 372endif 373 $(CC) $(ALL_CFLAGS) -o $@ $< -c 374$(obj)%.i: %.c 375 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 376$(obj)%.s: %.c 377 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 378 379######################################################################### 380 381# If the list of objects to link is empty, just create an empty built-in.o 382cmd_link_o_target = $(if $(strip $1),\ 383 $(LD) $(LDFLAGS) -r -o $@ $1,\ 384 rm -f $@; $(AR) rcs $@ ) 385 386######################################################################### 387