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 $(HOSTCPPFLAGS) 61 62# 63# Mac OS X / Darwin's C preprocessor is Apple specific. It 64# generates numerous errors and warnings. We want to bypass it 65# and use GNU C's cpp. To do this we pass the -traditional-cpp 66# option to the compiler. Note that the -traditional-cpp flag 67# DOES NOT have the same semantics as GNU C's flag, all it does 68# is invoke the GNU preprocessor in stock ANSI/ISO C fashion. 69# 70# Apple's linker is similar, thanks to the new 2 stage linking 71# multiple symbol definitions are treated as errors, hence the 72# -multiply_defined suppress option to turn off this error. 73# 74 75ifeq ($(HOSTOS),darwin) 76# get major and minor product version (e.g. '10' and '6' for Snow Leopard) 77DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.') 78DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.') 79 80os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \ 81 $(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;) 82 83# Snow Leopards build environment has no longer restrictions as described above 84HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc") 85HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp") 86HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress") 87else 88HOSTCC = gcc 89endif 90 91ifeq ($(HOSTOS),cygwin) 92HOSTCFLAGS += -ansi 93endif 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)/scripts/gcc-version.sh $(CC)) 121binutils-version = $(shell $(SHELL) $(SRCTREE)/scripts/binutils-version.sh $(AS)) 122dtc-version = $(shell $(SHELL) $(SRCTREE)/scripts/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 = $(CROSS_COMPILE)RANLIB 142DTC = dtc 143CHECK = sparse 144 145######################################################################### 146 147# Load generated board configuration 148ifeq ($(CONFIG_TPL_BUILD),y) 149# Include TPL autoconf 150sinclude $(OBJTREE)/include/tpl-autoconf.mk 151else 152ifeq ($(CONFIG_SPL_BUILD),y) 153# Include SPL autoconf 154sinclude $(OBJTREE)/include/spl-autoconf.mk 155else 156# Include normal autoconf 157sinclude $(OBJTREE)/include/autoconf.mk 158endif 159endif 160sinclude $(OBJTREE)/include/config.mk 161 162# Some architecture config.mk files need to know what CPUDIR is set to, 163# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files. 164# Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains 165# CPU-specific code. 166CPUDIR=arch/$(ARCH)/cpu/$(CPU) 167ifneq ($(SRCTREE)/$(CPUDIR),$(wildcard $(SRCTREE)/$(CPUDIR))) 168CPUDIR=arch/$(ARCH)/cpu 169endif 170 171sinclude $(TOPDIR)/arch/$(ARCH)/config.mk # include architecture dependend rules 172sinclude $(TOPDIR)/$(CPUDIR)/config.mk # include CPU specific rules 173 174ifdef SOC 175sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk # include SoC specific rules 176endif 177ifdef VENDOR 178BOARDDIR = $(VENDOR)/$(BOARD) 179else 180BOARDDIR = $(BOARD) 181endif 182ifdef BOARD 183sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules 184endif 185 186######################################################################### 187 188# We don't actually use $(ARFLAGS) anywhere anymore, so catch people 189# who are porting old code to latest mainline but not updating $(AR). 190ARFLAGS = $(error update your Makefile to use cmd_link_o_target and not AR) 191RELFLAGS= $(PLATFORM_RELFLAGS) 192DBGFLAGS= -g # -DDEBUG 193OPTFLAGS= -Os #-fomit-frame-pointer 194 195OBJCFLAGS += --gap-fill=0xff 196 197gccincdir := $(shell $(CC) -print-file-name=include) 198 199CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \ 200 -D__KERNEL__ 201 202# Enable garbage collection of un-used sections for SPL 203ifeq ($(CONFIG_SPL_BUILD),y) 204CPPFLAGS += -ffunction-sections -fdata-sections 205LDFLAGS_FINAL += --gc-sections 206endif 207 208ifneq ($(CONFIG_SYS_TEXT_BASE),) 209CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) 210endif 211 212ifeq ($(CONFIG_SPL_BUILD),y) 213CPPFLAGS += -DCONFIG_SPL_BUILD 214ifeq ($(CONFIG_TPL_BUILD),y) 215CPPFLAGS += -DCONFIG_TPL_BUILD 216endif 217endif 218 219# Does this architecture support generic board init? 220ifeq ($(__HAVE_ARCH_GENERIC_BOARD),) 221ifneq ($(CONFIG_SYS_GENERIC_BOARD),) 222CHECK_GENERIC_BOARD = $(error Your architecture does not support generic board. \ 223Please undefined CONFIG_SYS_GENERIC_BOARD in your board config file) 224endif 225endif 226 227ifneq ($(OBJTREE),$(SRCTREE)) 228CPPFLAGS += -I$(OBJTREE)/include 229endif 230 231CPPFLAGS += -I$(TOPDIR)/include -I$(SRCTREE)/arch/$(ARCH)/include 232CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \ 233 -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS) 234 235CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes 236 237ifdef BUILD_TAG 238CFLAGS += -DBUILD_TAG='"$(BUILD_TAG)"' 239endif 240 241CFLAGS_SSP := $(call cc-option,-fno-stack-protector) 242CFLAGS += $(CFLAGS_SSP) 243# Some toolchains enable security related warning flags by default, 244# but they don't make much sense in the u-boot world, so disable them. 245CFLAGS_WARN := $(call cc-option,-Wno-format-nonliteral) \ 246 $(call cc-option,-Wno-format-security) 247CFLAGS += $(CFLAGS_WARN) 248 249# Report stack usage if supported 250CFLAGS_STACK := $(call cc-option,-fstack-usage) 251CFLAGS += $(CFLAGS_STACK) 252 253BCURDIR = $(subst $(SRCTREE)/,,$(CURDIR:$(obj)%=%)) 254 255ifeq ($(findstring examples/,$(BCURDIR)),) 256ifeq ($(CONFIG_SPL_BUILD),) 257ifdef FTRACE 258CFLAGS += -finstrument-functions -DFTRACE 259endif 260endif 261endif 262 263# $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g<format> 264# option to the assembler. 265AFLAGS_DEBUG := 266 267# turn jbsr into jsr for m68k 268ifeq ($(ARCH),m68k) 269ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4) 270AFLAGS_DEBUG := -Wa,-gstabs,-S 271endif 272endif 273 274AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS) 275 276LDFLAGS += $(PLATFORM_LDFLAGS) 277LDFLAGS_FINAL += -Bstatic 278 279LDFLAGS_u-boot += -T $(obj)u-boot.lds $(LDFLAGS_FINAL) 280ifneq ($(CONFIG_SYS_TEXT_BASE),) 281LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE) 282endif 283 284LDFLAGS_$(SPL_BIN) += -T $(obj)u-boot-spl.lds $(LDFLAGS_FINAL) 285ifneq ($(CONFIG_SPL_TEXT_BASE),) 286LDFLAGS_$(SPL_BIN) += -Ttext $(CONFIG_SPL_TEXT_BASE) 287endif 288 289# Linus' kernel sanity checking tool 290CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 291 -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF) 292 293# Location of a usable BFD library, where we define "usable" as 294# "built for ${HOST}, supports ${TARGET}". Sensible values are 295# - When cross-compiling: the root of the cross-environment 296# - Linux/ppc (native): /usr 297# - NetBSD/ppc (native): you lose ... (must extract these from the 298# binutils build directory, plus the native and U-Boot include 299# files don't like each other) 300# 301# So far, this is used only by tools/gdb/Makefile. 302 303ifeq ($(HOSTOS),darwin) 304BFD_ROOT_DIR = /usr/local/tools 305else 306ifeq ($(HOSTARCH),$(ARCH)) 307# native 308BFD_ROOT_DIR = /usr 309else 310#BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386 311#BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386 312BFD_ROOT_DIR = /opt/powerpc 313endif 314endif 315 316######################################################################### 317 318export HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE \ 319 AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP MAKE 320export CONFIG_SYS_TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS 321 322######################################################################### 323 324# Allow boards to use custom optimize flags on a per dir/file basis 325ALL_AFLAGS = $(AFLAGS) $(AFLAGS_$(BCURDIR)/$(@F)) $(AFLAGS_$(BCURDIR)) 326ALL_CFLAGS = $(CFLAGS) $(CFLAGS_$(BCURDIR)/$(@F)) $(CFLAGS_$(BCURDIR)) 327EXTRA_CPPFLAGS = $(CPPFLAGS_$(BCURDIR)/$(@F)) $(CPPFLAGS_$(BCURDIR)) 328ALL_CFLAGS += $(EXTRA_CPPFLAGS) 329 330# The _DEP version uses the $< file target (for dependency generation) 331# See rules.mk 332EXTRA_CPPFLAGS_DEP = $(CPPFLAGS_$(BCURDIR)/$(addsuffix .o,$(basename $<))) \ 333 $(CPPFLAGS_$(BCURDIR)) 334$(obj)%.s: %.S 335 $(CPP) $(ALL_AFLAGS) -o $@ $< 336$(obj)%.o: %.S 337 $(CC) $(ALL_AFLAGS) -o $@ $< -c 338$(obj)%.o: %.c 339ifneq ($(CHECKSRC),0) 340 $(CHECK) $(CHECKFLAGS) $(ALL_CFLAGS) $< 341endif 342 $(CC) $(ALL_CFLAGS) -o $@ $< -c 343$(obj)%.i: %.c 344 $(CPP) $(ALL_CFLAGS) -o $@ $< -c 345$(obj)%.s: %.c 346 $(CC) $(ALL_CFLAGS) -o $@ $< -c -S 347 348######################################################################### 349 350# If the list of objects to link is empty, just create an empty built-in.o 351cmd_link_o_target = $(if $(strip $1),\ 352 $(LD) $(LDFLAGS) -r -o $@ $1,\ 353 rm -f $@; $(AR) rcs $@ ) 354 355######################################################################### 356