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102 lines
4.1 KiB
102 lines
4.1 KiB
### |
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# build: Generic definitions |
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# |
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# Lots of this code have been borrowed or heavily inspired from parts |
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# of kbuild code, which is not credited, but mostly developed by: |
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# |
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# Copyright (C) Sam Ravnborg <[email protected]>, 2015 |
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# Copyright (C) Linus Torvalds <[email protected]>, 2015 |
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# |
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### |
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# Convenient variables |
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comma := , |
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squote := ' |
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pound := \# |
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### |
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# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o |
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dot-target = $(dir $@).$(notdir $@) |
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### |
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# filename of target with directory and extension stripped |
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basetarget = $(basename $(notdir $@)) |
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### |
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# The temporary file to save gcc -MD generated dependencies must not |
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# contain a comma |
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depfile = $(subst $(comma),_,$(dot-target).d) |
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### |
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# Check if both arguments has same arguments. Result is empty string if equal. |
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arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
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$(filter-out $(cmd_$@), $(cmd_$(1))) ) |
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### |
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# Escape single quote for use in echo statements |
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escsq = $(subst $(squote),'\$(squote)',$1) |
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# Echo command |
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# Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
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echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
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echo ' $(call escsq,$($(quiet)cmd_$(1)))';) |
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### |
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# Replace >$< with >$$< to preserve $ when reloading the .cmd file |
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# (needed for make) |
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# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
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# (needed for make) |
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# Replace >'< with >'\''< to be able to enclose the whole string in '...' |
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# (needed for the shell) |
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make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
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### |
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# Find any prerequisites that is newer than target or that does not exist. |
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# PHONY targets skipped in both cases. |
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any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
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### |
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# Copy dependency data into .cmd file |
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# - gcc -M dependency info |
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# - command line to create object 'cmd_object :=' |
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dep-cmd = $(if $(wildcard $(fixdep)), \ |
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$(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \ |
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rm -f $(depfile); \ |
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mv -f $(dot-target).tmp $(dot-target).cmd, \ |
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printf '$(pound) cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \ |
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printf '$(pound) using basic dep data\n\n' >> $(dot-target).cmd; \ |
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cat $(depfile) >> $(dot-target).cmd; \ |
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printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd) |
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### |
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# if_changed_dep - execute command if any prerequisite is newer than |
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# target, or command line has changed and update |
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# dependencies in the cmd file |
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if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \ |
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@set -e; \ |
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$(echo-cmd) $(cmd_$(1)); \ |
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$(dep-cmd)) |
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# if_changed - execute command if any prerequisite is newer than |
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# target, or command line has changed |
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if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
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@set -e; \ |
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$(echo-cmd) $(cmd_$(1)); \ |
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printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
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### |
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# C flags to be used in rule definitions, includes: |
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# - depfile generation |
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# - global $(CFLAGS) |
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# - per target C flags |
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# - per object C flags |
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# - BUILD_STR macro to allow '-D"$(variable)"' constructs |
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c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) |
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c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1)) |
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c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2)) |
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cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj)) |
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### |
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## HOSTCC C flags |
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host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(KBUILD_HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj))
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