2 # build: Generic definitions
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:
7 # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
8 # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
12 # Convenient variables
17 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
18 dot-target = $(dir $@).$(notdir $@)
21 # filename of target with directory and extension stripped
22 basetarget = $(basename $(notdir $@))
25 # The temporary file to save gcc -MD generated dependencies must not
27 depfile = $(subst $(comma),_,$(dot-target).d)
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))) )
35 # Escape single quote for use in echo statements
36 escsq = $(subst $(squote),'\$(squote)',$1)
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)))';)
44 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
46 # Replace >#< with >\#< to avoid starting a comment in the .cmd file
48 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
49 # (needed for the shell)
50 make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
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 $^),$^)
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; \
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)
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)), \
76 $(echo-cmd) $(cmd_$(1)) && $(dep-cmd))
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)), \
82 $(echo-cmd) $(cmd_$(1)); \
83 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
86 # C flags to be used in rule definitions, includes:
87 # - depfile generation
89 # - per target C flags
90 # - per object C flags
91 # - BUILD_STR macro to allow '-D"$(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))
100 host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj))