1 ###
2 # build: Generic definitions
3 #
4 # Lots of this code have been borrowed or hea
5 # of kbuild code, which is not credited, but
6 #
7 # Copyright (C) Sam Ravnborg <sam@mars.ravnbor
8 # Copyright (C) Linus Torvalds <torvalds@linux
9 #
10
11 ###
12 # Convenient variables
13 comma := ,
14 squote := '
15 pound := \#
16
17 ###
18 # Name of target with a '.' as filename prefix
19 dot-target = $(dir $@).$(notdir $@)
20
21 ###
22 # filename of target with directory and extens
23 basetarget = $(basename $(notdir $@))
24
25 ###
26 # The temporary file to save gcc -MD generated
27 # contain a comma
28 depfile = $(subst $(comma),_,$(dot-target).d)
29
30 ###
31 # Check if both arguments has same arguments.
32 arg-check = $(strip $(filter-out $(cmd_$(1)),
33 $(filter-out $(cmd_$@),
34
35 ###
36 # Escape single quote for use in echo statemen
37 escsq = $(subst $(squote),'\$(squote)',$1)
38
39 # Echo command
40 # Short version is used, if $(quiet) equals `q
41 echo-cmd = $(if $($(quiet)cmd_$(1)),\
42 echo ' $(call escsq,$($(quiet)cmd_
43
44 ###
45 # Replace >$< with >$$< to preserve $ when rel
46 # (needed for make)
47 # Replace >#< with >$(pound)< to avoid startin
48 # (needed for make)
49 # Replace >'< with >'\''< to be able to enclos
50 # (needed for the shell)
51 make-cmd = $(call escsq,$(subst $(pound),$$(po
52
53 ###
54 # Find any prerequisites that is newer than ta
55 # PHONY targets skipped in both cases.
56 any-prereq = $(filter-out $(PHONY),$?) $(filte
57
58 ###
59 # Copy dependency data into .cmd file
60 # - gcc -M dependency info
61 # - command line to create object 'cmd_object
62 dep-cmd = $(if $(wildcard $(fixdep)),
63 $(fixdep) $(depfile) $@ '$(make-cmd
64 rm -f $(depfile);
65 mv -f $(dot-target).tmp $(dot-targe
66 printf '$(pound) cannot find fixdep
67 printf '$(pound) using basic dep da
68 cat $(depfile) >> $(dot-target).cmd
69 printf '\n%s\n' 'cmd_$@ := $(make-c
70
71 ###
72 # if_changed_dep - execute command if any pre
73 # target, or command line ha
74 # dependencies in the cmd fi
75 if_changed_dep = $(if $(strip $(any-prereq) $(
76 @set -e;
77 $(echo-cmd) $(cmd_$(1));
78 $(dep-cmd))
79
80 # if_changed - execute command if any pre
81 # target, or command line ha
82 if_changed = $(if $(strip $(any-prereq) $(arg-
83 @set -e;
84 $(echo-cmd) $(cmd_$(1));
85 printf '%s\n' 'cmd_$@ := $(make-
86
87 ###
88 # C flags to be used in rule definitions, incl
89 # - depfile generation
90 # - global $(CFLAGS)
91 # - per target C flags
92 # - per object C flags
93 # - BUILD_STR macro to allow '-D"$(variable)"'
94 c_flags_1 = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CF
95 c_flags_2 = $(filter-out $(CFLAGS_REMOVE_$(bas
96 c_flags = $(filter-out $(CFLAGS_REMOVE_$(obj
97 cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CX
98
99 ###
100 ## HOSTCC C flags
101
102 host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $
103
104 # output directory for tests below
105 TMPOUT = .tmp_$$$$
106
107 # try-run
108 # Usage: option = $(call try-run, $(CC)...-o "
109 # Exit code chooses option. "$$TMP" serves as
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=w
122 cc-option = $(call try-run, \
123 $(CC) -Werror $(1) -c -x c /dev/null -
124
125 # delete partially updated (i.e. corrupted) fi
126 .DELETE_ON_ERROR:
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