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