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- ###
- # build: Generic definitions
- #
- # Lots of this code have been borrowed or heavily inspired from parts
- # of kbuild code, which is not credited, but mostly developed by:
- #
- # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
- # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
- #
- ###
- # Convenient variables
- comma := ,
- squote := '
- ###
- # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
- dot-target = $(dir $@).$(notdir $@)
- ###
- # filename of target with directory and extension stripped
- basetarget = $(basename $(notdir $@))
- ###
- # The temporary file to save gcc -MD generated dependencies must not
- # contain a comma
- depfile = $(subst $(comma),_,$(dot-target).d)
- ###
- # Check if both arguments has same arguments. Result is empty string if equal.
- arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
- $(filter-out $(cmd_$@), $(cmd_$(1))) )
- ###
- # Escape single quote for use in echo statements
- escsq = $(subst $(squote),'\$(squote)',$1)
- # Echo command
- # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
- echo-cmd = $(if $($(quiet)cmd_$(1)),\
- echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
- ###
- # Replace >$< with >$$< to preserve $ when reloading the .cmd file
- # (needed for make)
- # Replace >#< with >\#< to avoid starting a comment in the .cmd file
- # (needed for make)
- # Replace >'< with >'\''< to be able to enclose the whole string in '...'
- # (needed for the shell)
- make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
- ###
- # Find any prerequisites that is newer than target or that does not exist.
- # PHONY targets skipped in both cases.
- any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
- ###
- # Copy dependency data into .cmd file
- # - gcc -M dependency info
- # - command line to create object 'cmd_object :='
- dep-cmd = $(if $(wildcard $(fixdep)), \
- $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \
- rm -f $(depfile); \
- mv -f $(dot-target).tmp $(dot-target).cmd, \
- printf '\# cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \
- printf '\# using basic dep data\n\n' >> $(dot-target).cmd; \
- cat $(depfile) >> $(dot-target).cmd; \
- printf '%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd)
- ###
- # if_changed_dep - execute command if any prerequisite is newer than
- # target, or command line has changed and update
- # dependencies in the cmd file
- if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \
- @set -e; \
- $(echo-cmd) $(cmd_$(1)) && $(dep-cmd))
- # if_changed - execute command if any prerequisite is newer than
- # target, or command line has changed
- if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
- @set -e; \
- $(echo-cmd) $(cmd_$(1)); \
- printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
- ###
- # C flags to be used in rule definitions, includes:
- # - depfile generation
- # - global $(CFLAGS)
- # - per target C flags
- # - per object C flags
- # - BUILD_STR macro to allow '-D"$(variable)"' constructs
- c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj))
- cxx_flags = -Wp,-MD,$(depfile),-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj))
- ###
- ## HOSTCC C flags
- host_c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj))
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