| ### |
| # 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 := ' |
| pound := \# |
| |
| ### |
| # 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 >$$< to preserve $ when reloading the .cmd file |
| # (needed for make) |
| # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
| # (needed for make) |
| # Replace >'< with >'\''< to be able to enclose the whole string in '...' |
| # (needed for the shell) |
| make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(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 $(dot-target).cmd, \ |
| printf '$(pound) cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \ |
| printf '$(pound) using basic dep data\n\n' >> $(dot-target).cmd; \ |
| cat $(depfile) >> $(dot-target).cmd; \ |
| printf '\n%s\n' 'cmd_$@ := $(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_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) |
| c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1)) |
| c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2)) |
| cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj)) |
| |
| ### |
| ## HOSTCC C flags |
| |
| host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(KBUILD_HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj)) |
