1#### 2# kbuild: Generic definitions 3 4# Convenient variables 5comma := , 6quote := " 7squote := ' 8empty := 9space := $(empty) $(empty) 10pound := \# 11 12### 13# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o 14dot-target = $(dir $@).$(notdir $@) 15 16### 17# The temporary file to save gcc -MD generated dependencies must not 18# contain a comma 19depfile = $(subst $(comma),_,$(dot-target).d) 20 21### 22# filename of target with directory and extension stripped 23basetarget = $(basename $(notdir $@)) 24 25### 26# filename of first prerequisite with directory and extension stripped 27baseprereq = $(basename $(notdir $<)) 28 29### 30# Escape single quote for use in echo statements 31escsq = $(subst $(squote),'\$(squote)',$1) 32 33### 34# Easy method for doing a status message 35 kecho := : 36 quiet_kecho := echo 37silent_kecho := : 38kecho := $($(quiet)kecho) 39 40### 41# filechk is used to check if the content of a generated file is updated. 42# Sample usage: 43# define filechk_sample 44# echo $KERNELRELEASE 45# endef 46# version.h : Makefile 47# $(call filechk,sample) 48# The rule defined shall write to stdout the content of the new file. 49# The existing file will be compared with the new one. 50# - If no file exist it is created 51# - If the content differ the new file is used 52# - If they are equal no change, and no timestamp update 53# - stdin is piped in from the first prerequisite ($<) so one has 54# to specify a valid file as first prerequisite (often the kbuild file) 55define filechk 56 $(Q)set -e; \ 57 $(kecho) ' CHK $@'; \ 58 mkdir -p $(dir $@); \ 59 $(filechk_$(1)) < $< > $@.tmp; \ 60 if [ -r $@ ] && cmp -s $@ $@.tmp; then \ 61 rm -f $@.tmp; \ 62 else \ 63 $(kecho) ' UPD $@'; \ 64 mv -f $@.tmp $@; \ 65 fi 66endef 67 68###### 69# gcc support functions 70# See documentation in Documentation/kbuild/makefiles.txt 71 72# cc-cross-prefix 73# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) 74# Return first prefix where a prefix$(CC) is found in PATH. 75# If no $(CC) found in PATH with listed prefixes return nothing 76cc-cross-prefix = \ 77 $(word 1, $(foreach c,$(1), \ 78 $(shell set -e; \ 79 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ 80 echo $(c); \ 81 fi))) 82 83# output directory for tests below 84TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) 85 86# try-run 87# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) 88# Exit code chooses option. "$$TMP" is can be used as temporary file and 89# is automatically cleaned up. 90# modifed for U-Boot: prevent cc-option from leaving .*.su files 91try-run = $(shell set -e; \ 92 TMP="$(TMPOUT).$$$$.tmp"; \ 93 TMPO="$(TMPOUT).$$$$.o"; \ 94 TMPSU="$(TMPOUT).$$$$.su"; \ 95 if ($(1)) >/dev/null 2>&1; \ 96 then echo "$(2)"; \ 97 else echo "$(3)"; \ 98 fi; \ 99 rm -f "$$TMP" "$$TMPO" "$$TMPSU") 100 101# as-option 102# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) 103 104as-option = $(call try-run,\ 105 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) 106 107# as-instr 108# Usage: cflags-y += $(call as-instr,instr,option1,option2) 109 110as-instr = $(call try-run,\ 111 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) 112 113# cc-option 114# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) 115 116cc-option = $(call try-run,\ 117 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) 118 119# cc-option-yn 120# Usage: flag := $(call cc-option-yn,-march=winchip-c6) 121cc-option-yn = $(call try-run,\ 122 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) 123 124# cc-option-align 125# Prefix align with either -falign or -malign 126cc-option-align = $(subst -functions=0,,\ 127 $(call cc-option,-falign-functions=0,-malign-functions=0)) 128 129# cc-disable-warning 130# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) 131cc-disable-warning = $(call try-run,\ 132 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) 133 134# cc-name 135# Expands to either gcc or clang 136cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc) 137 138# cc-version 139cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) 140 141# cc-fullversion 142cc-fullversion = $(shell $(CONFIG_SHELL) \ 143 $(srctree)/scripts/gcc-version.sh -p $(CC)) 144 145# cc-ifversion 146# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) 147cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4)) 148 149# added for U-Boot 150binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS)) 151dtc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/dtc-version.sh $(DTC)) 152 153# cc-ldoption 154# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) 155cc-ldoption = $(call try-run,\ 156 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) 157 158# ld-option 159# Usage: LDFLAGS += $(call ld-option, -X) 160ld-option = $(call try-run,\ 161 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) 162 163# ar-option 164# Usage: KBUILD_ARFLAGS := $(call ar-option,D) 165# Important: no spaces around options 166ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) 167 168# ld-version 169# Note this is mainly for HJ Lu's 3 number binutil versions 170ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) 171 172# ld-ifversion 173# Usage: $(call ld-ifversion, -ge, 22252, y) 174ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) 175 176###### 177 178### 179# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= 180# Usage: 181# $(Q)$(MAKE) $(build)=dir 182build := -f $(srctree)/scripts/Makefile.build obj 183 184### 185# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= 186# Usage: 187# $(Q)$(MAKE) $(modbuiltin)=dir 188modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj 189 190### 191# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= 192# Usage: 193# $(Q)$(MAKE) $(dtbinst)=dir 194dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj 195 196### 197# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= 198# Usage: 199# $(Q)$(MAKE) $(clean)=dir 200clean := -f $(srctree)/scripts/Makefile.clean obj 201 202### 203# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj= 204# Usage: 205# $(Q)$(MAKE) $(hdr-inst)=dir 206hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj 207 208# Prefix -I with $(srctree) if it is not an absolute path. 209# skip if -I has no parameter 210addtree = $(if $(patsubst -I%,%,$(1)), \ 211$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) 212 213# Find all -I options and call addtree 214flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) 215 216# echo command. 217# Short version is used, if $(quiet) equals `quiet_', otherwise full one. 218echo-cmd = $(if $($(quiet)cmd_$(1)),\ 219 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) 220 221# printing commands 222cmd = @$(echo-cmd) $(cmd_$(1)) 223 224# Add $(obj)/ for paths that are not absolute 225objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) 226 227### 228# if_changed - execute command if any prerequisite is newer than 229# target, or command line has changed 230# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies 231# including used config symbols 232# if_changed_rule - as if_changed but execute rule instead 233# See Documentation/kbuild/makefiles.txt for more info 234 235ifneq ($(KBUILD_NOCMDDEP),1) 236# Check if both arguments has same arguments. Result is empty string if equal. 237# User may override this check using make KBUILD_NOCMDDEP=1 238arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ 239 $(filter-out $(cmd_$@), $(cmd_$(1))) ) 240else 241arg-check = $(if $(strip $(cmd_$@)),,1) 242endif 243 244# Replace >$< with >$$< to preserve $ when reloading the .cmd file 245# (needed for make) 246# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file 247# (needed for make) 248# Replace >'< with >'\''< to be able to enclose the whole string in '...' 249# (needed for the shell) 250make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) 251 252# Find any prerequisites that is newer than target or that does not exist. 253# PHONY targets skipped in both cases. 254any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) 255 256# Execute command if command has changed or prerequisite(s) are updated. 257# 258if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ 259 @set -e; \ 260 $(echo-cmd) $(cmd_$(1)); \ 261 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) 262 263# Execute the command and also postprocess generated .d dependencies file. 264if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ 265 @set -e; \ 266 $(echo-cmd) $(cmd_$(1)); \ 267 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ 268 rm -f $(depfile); \ 269 mv -f $(dot-target).tmp $(dot-target).cmd) 270 271# Usage: $(call if_changed_rule,foo) 272# Will check if $(cmd_foo) or any of the prerequisites changed, 273# and if so will execute $(rule_foo). 274if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ 275 @set -e; \ 276 $(rule_$(1))) 277 278### 279# why - tell why a a target got build 280# enabled by make V=2 281# Output (listed in the order they are checked): 282# (1) - due to target is PHONY 283# (2) - due to target missing 284# (3) - due to: file1.h file2.h 285# (4) - due to command line change 286# (5) - due to missing .cmd file 287# (6) - due to target not in $(targets) 288# (1) PHONY targets are always build 289# (2) No target, so we better build it 290# (3) Prerequisite is newer than target 291# (4) The command line stored in the file named dir/.target.cmd 292# differed from actual command line. This happens when compiler 293# options changes 294# (5) No dir/.target.cmd file (used to store command line) 295# (6) No dir/.target.cmd file and target not listed in $(targets) 296# This is a good hint that there is a bug in the kbuild file 297ifeq ($(KBUILD_VERBOSE),2) 298why = \ 299 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ 300 $(if $(wildcard $@), \ 301 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ 302 $(if $(arg-check), \ 303 $(if $(cmd_$@),- due to command line change, \ 304 $(if $(filter $@, $(targets)), \ 305 - due to missing .cmd file, \ 306 - due to $(notdir $@) not in $$(targets) \ 307 ) \ 308 ) \ 309 ) \ 310 ), \ 311 - due to target missing \ 312 ) \ 313 ) 314 315echo-why = $(call escsq, $(strip $(why))) 316endif 317 318# delete partially updated (i.e. corrupted) files on error 319.DELETE_ON_ERROR: 320 321# do not delete intermediate files automatically 322.SECONDARY: 323 324ifdef CONFIG_SPL_BUILD 325SPL_ := SPL_ 326ifeq ($(CONFIG_TPL_BUILD),y) 327SPL_TPL_ := TPL_ 328else 329SPL_TPL_ := SPL_ 330endif 331else 332SPL_ := 333SPL_TPL_ := 334endif 335