scripts/Kbuild.include

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