Kbuild.include

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

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/scripts/Kbuild.include
