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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 := ' | |
9564a8cf | 15 | pound := \# |
c819e2cf JO |
16 | |
17 | ### | |
18 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
19 | dot-target = $(dir $@).$(notdir $@) | |
20 | ||
21 | ### | |
22 | # filename of target with directory and extension stripped | |
23 | basetarget = $(basename $(notdir $@)) | |
24 | ||
25 | ### | |
26 | # The temporary file to save gcc -MD generated dependencies must not | |
27 | # contain a comma | |
28 | depfile = $(subst $(comma),_,$(dot-target).d) | |
29 | ||
30 | ### | |
31 | # Check if both arguments has same arguments. Result is empty string if equal. | |
32 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ | |
33 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
34 | ||
35 | ### | |
36 | # Escape single quote for use in echo statements | |
37 | escsq = $(subst $(squote),'\$(squote)',$1) | |
38 | ||
39 | # Echo command | |
40 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
41 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ | |
42 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';) | |
43 | ||
44 | ### | |
45 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file | |
46 | # (needed for make) | |
9564a8cf | 47 | # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
c819e2cf JO |
48 | # (needed for make) |
49 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' | |
50 | # (needed for the shell) | |
9564a8cf | 51 | make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
c819e2cf JO |
52 | |
53 | ### | |
54 | # Find any prerequisites that is newer than target or that does not exist. | |
55 | # PHONY targets skipped in both cases. | |
56 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
57 | ||
275e2d95 JO |
58 | ### |
59 | # Copy dependency data into .cmd file | |
60 | # - gcc -M dependency info | |
61 | # - command line to create object 'cmd_object :=' | |
9fb81323 JO |
62 | dep-cmd = $(if $(wildcard $(fixdep)), \ |
63 | $(fixdep) $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp; \ | |
64 | rm -f $(depfile); \ | |
65 | mv -f $(dot-target).tmp $(dot-target).cmd, \ | |
9feeb638 PM |
66 | printf '$(pound) cannot find fixdep (%s)\n' $(fixdep) > $(dot-target).cmd; \ |
67 | printf '$(pound) using basic dep data\n\n' >> $(dot-target).cmd; \ | |
9fb81323 | 68 | cat $(depfile) >> $(dot-target).cmd; \ |
a5ba0a1a | 69 | printf '\n%s\n' 'cmd_$@ := $(make-cmd)' >> $(dot-target).cmd) |
275e2d95 | 70 | |
c819e2cf JO |
71 | ### |
72 | # if_changed_dep - execute command if any prerequisite is newer than | |
73 | # target, or command line has changed and update | |
74 | # dependencies in the cmd file | |
75 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)), \ | |
2fedf79b | 76 | @set -e; \ |
a278f3d8 AN |
77 | $(echo-cmd) $(cmd_$(1)); \ |
78 | $(dep-cmd)) | |
c819e2cf JO |
79 | |
80 | # if_changed - execute command if any prerequisite is newer than | |
81 | # target, or command line has changed | |
2fedf79b JO |
82 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
83 | @set -e; \ | |
84 | $(echo-cmd) $(cmd_$(1)); \ | |
85 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
c819e2cf JO |
86 | |
87 | ### | |
88 | # C flags to be used in rule definitions, includes: | |
89 | # - depfile generation | |
90 | # - global $(CFLAGS) | |
91 | # - per target C flags | |
92 | # - per object C flags | |
93 | # - BUILD_STR macro to allow '-D"$(variable)"' constructs | |
baa1973e | 94 | c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CFLAGS) -D"BUILD_STR(s)=\#s" $(CFLAGS_$(basetarget).o) $(CFLAGS_$(obj)) |
2ec8107d JO |
95 | c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(c_flags_1)) |
96 | c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj)), $(c_flags_2)) | |
baa1973e | 97 | cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXXFLAGS_$(basetarget).o) $(CXXFLAGS_$(obj)) |
0c3b7e42 JO |
98 | |
99 | ### | |
100 | ## HOSTCC C flags | |
101 | ||
c77a78c2 | 102 | host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj)) |
b61442df MY |
103 | |
104 | # output directory for tests below | |
105 | TMPOUT = .tmp_$$$$ | |
106 | ||
107 | # try-run | |
108 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
109 | # Exit code chooses option. "$$TMP" serves as a temporary file and is | |
110 | # automatically cleaned up. | |
111 | try-run = $(shell set -e; \ | |
112 | TMP=$(TMPOUT)/tmp; \ | |
113 | mkdir -p $(TMPOUT); \ | |
114 | trap "rm -rf $(TMPOUT)" EXIT; \ | |
115 | if ($(1)) >/dev/null 2>&1; \ | |
116 | then echo "$(2)"; \ | |
117 | else echo "$(3)"; \ | |
118 | fi) | |
119 | ||
120 | # cc-option | |
121 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) | |
122 | cc-option = $(call try-run, \ | |
123 | $(CC) -Werror $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) | |
124 | ||
125 | # delete partially updated (i.e. corrupted) files on error | |
126 | .DELETE_ON_ERROR: |