tools/build/Build.include

   1 ###
   2 # build: Generic definitions
   3 #
   4 #  Lots of this code have been borrowed or heavily inspired from parts
   5 #  of kbuild code, which is not credited, but mostly developed by:
   6 #
   7 #  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
   8 #  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
   9 #
  10
  11 ###
  12 # Convenient variables
  13 comma   := ,
  14 squote  := '
  15
  16 ###
  17 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
  18 dot-target = $(dir $@).$(notdir $@)
  19
  20 ###
  21 # filename of target with directory and extension stripped
  22 basetarget = $(basename $(notdir $@))
  23
  24 ###
  25 # The temporary file to save gcc -MD generated dependencies must not
  26 # contain a comma
  27 depfile = $(subst $(comma),_,$(dot-target).d)
  28
  29 ###
  30 # Check if both arguments has same arguments. Result is empty string if equal.
  31 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
  32                     $(filter-out $(cmd_$@),   $(cmd_$(1))) )
  33
  34 ###
  35 # Escape single quote for use in echo statements
  36 escsq = $(subst $(squote),'\$(squote)',$1)
  37
  38 # Echo command
  39 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
  40 echo-cmd = $(if $($(quiet)cmd_$(1)),\
  41            echo '  $(call escsq,$($(quiet)cmd_$(1)))';)
  42
  43 ###
  44 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
  45 # (needed for make)
  46 # Replace >#< with >\#< to avoid starting a comment in the .cmd file
  47 # (needed for make)
  48 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
  49 # (needed for the shell)
  50 make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
  51
  52 ###
  53 # Find any prerequisites that is newer than target or that does not exist.
  54 # PHONY targets skipped in both cases.
  55 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
  56
  57 ###
  58 # Copy dependency data into .cmd file
  59 #  - gcc -M dependency info
  60 #  - command line to create object 'cmd_object :='
  61 dep-cmd = $(if $(wildcard $(fixdep)),                                           \
  62            $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;           \
  63            rm -f $(depfile);                                                    \
  64            mv -f $(dot-target).tmp $(dot-target).cmd,                           \
  65            printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
  66            printf '\# using basic dep data\n\n' >> $(dot-target).cmd;           \
  67            cat $(depfile) >> $(dot-target).cmd;                                 \
  68            printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
  69
  70 ###
  71 # if_changed_dep  - execute command if any prerequisite is newer than
  72 #                   target, or command line has changed and update
  73 #                   dependencies in the cmd file
  74 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),         \
  75                   @set -e;                                         \
  76                   $(echo-cmd) $(cmd_$(1)) && $(dep-cmd))
  77
  78 # if_changed      - execute command if any prerequisite is newer than
  79 #                   target, or command line has changed
  80 if_changed = $(if $(strip $(any-prereq) $(arg-check)),                   \
  81               @set -e;                                                   \
  82               $(echo-cmd) $(cmd_$(1));                                   \
  83               printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
  84
  85 ###
  86 # C flags to be used in rule definitions, includes:
  87 # - depfile generation
  88 # - global $(CFLAGS)
  89 # - per target C flags
  90 # - per object C flags
  91 # - BUILD_STR macro to allow '-D"$(variable)"' constructs
  92 c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
  93 c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1))
  94 c_flags   = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2))
  95 cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj))
  96
  97 ###
  98 ## HOSTCC C flags
  99
 100 host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj))