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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 | ||
275e2d95 JO |
57 | ### |
58 | # Copy dependency data into .cmd file | |
59 | # - gcc -M dependency info | |
60 | # - command line to create object 'cmd_object :=' | |
9fb81323 JO |
61 | dep-cmd = $(if $(wildcard $(fixdep)), \ |
62 | $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \ | |
63 | rm -f $(depfile); \ | |
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) >> $(dot-target).cmd; \ | |
a5ba0a1a | 68 | printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd) |
275e2d95 | 69 | |
c819e2cf JO |
70 | ### |
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)), \ | |
2fedf79b JO |
75 | @set -e; \ |
76 | $(echo-cmd) $(cmd_$(1)) && $(dep-cmd)) | |
c819e2cf JO |
77 | |
78 | # if_changed - execute command if any prerequisite is newer than | |
79 | # target, or command line has changed | |
2fedf79b JO |
80 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
81 | @set -e; \ | |
82 | $(echo-cmd) $(cmd_$(1)); \ | |
83 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
c819e2cf JO |
84 | |
85 | ### | |
86 | # C flags to be used in rule definitions, includes: | |
87 | # - depfile generation | |
88 | # - global $(CFLAGS) | |
89 | # - per target C flags | |
90 | # - per object C flags | |
91 | # - BUILD_STR macro to allow '-D"$(variable)"' constructs | |
baa1973e | 92 | c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) |
2ec8107d JO |
93 | c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1)) |
94 | c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2)) | |
baa1973e | 95 | cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj)) |
0c3b7e42 JO |
96 | |
97 | ### | |
98 | ## HOSTCC C flags | |
99 | ||
baa1973e | 100 | host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CHOSTFLAGS) -D"BUILD_STR(s)=\#s" $(CHOSTFLAGS_$(basetarget).o) $(CHOSTFLAGS_$(obj)) |