projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c819e2cf JO |
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 | # if_changed_dep - execute command if any prerequisite is newer than | |
| 59 | # target, or command line has changed and update | |
| 60 | # dependencies in the cmd file | |
| 61 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \ | |
| 62 | @set -e; \ | |
| 63 | $(echo-cmd) $(cmd_$(1)); \ | |
| 64 | cat $(depfile) > $(dot-target).cmd; \ | |
| 65 | printf '%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd) | |
| 66 | ||
| 67 | # if_changed - execute command if any prerequisite is newer than | |
| 68 | # target, or command line has changed | |
| 69 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ | |
| 70 | @set -e; \ | |
| 71 | $(echo-cmd) $(cmd_$(1)); \ | |
| 72 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
| 73 | ||
| 74 | ### | |
| 75 | # C flags to be used in rule definitions, includes: | |
| 76 | # - depfile generation | |
| 77 | # - global $(CFLAGS) | |
| 78 | # - per target C flags | |
| 79 | # - per object C flags | |
| 80 | # - BUILD_STR macro to allow '-D"$(variable)"' constructs | |
| 81 | c_flags = -Wp,-MD,$(depfile),-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) |