Commit | Line | Data |
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96ac6d43 | 1 | # SPDX-License-Identifier: GPL-2.0 |
8ec4b4ff SR |
2 | #### |
3 | # kbuild: Generic definitions | |
4 | ||
beda9f3a | 5 | # Convenient variables |
8ec4b4ff | 6 | comma := , |
13338935 | 7 | quote := " |
d51bfb78 | 8 | squote := ' |
8ec4b4ff SR |
9 | empty := |
10 | space := $(empty) $(empty) | |
9c8fa9bc | 11 | space_escape := _-_SPACE_-_ |
9564a8cf | 12 | pound := \# |
8ec4b4ff | 13 | |
48f1f058 SR |
14 | ### |
15 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
16 | dot-target = $(dir $@).$(notdir $@) | |
17 | ||
8ec4b4ff | 18 | ### |
30a77297 | 19 | # The temporary file to save gcc -MMD generated dependencies must not |
8ec4b4ff | 20 | # contain a comma |
48f1f058 | 21 | depfile = $(subst $(comma),_,$(dot-target).d) |
8ec4b4ff | 22 | |
5e8d780d SR |
23 | ### |
24 | # filename of target with directory and extension stripped | |
25 | basetarget = $(basename $(notdir $@)) | |
26 | ||
afa974b7 MY |
27 | ### |
28 | # real prerequisites without phony targets | |
29 | real-prereqs = $(filter-out $(PHONY), $^) | |
30 | ||
d51bfb78 SR |
31 | ### |
32 | # Escape single quote for use in echo statements | |
33 | escsq = $(subst $(squote),'\$(squote)',$1) | |
34 | ||
7e826c44 MY |
35 | ### |
36 | # Quote a string to pass it to C files. foo => '"foo"' | |
37 | stringify = $(squote)$(quote)$1$(quote)$(squote) | |
38 | ||
5410ecc0 MF |
39 | ### |
40 | # Easy method for doing a status message | |
41 | kecho := : | |
42 | quiet_kecho := echo | |
43 | silent_kecho := : | |
44 | kecho := $($(quiet)kecho) | |
45 | ||
8ec4b4ff SR |
46 | ### |
47 | # filechk is used to check if the content of a generated file is updated. | |
48 | # Sample usage: | |
ba97df45 MY |
49 | # |
50 | # filechk_sample = echo $(KERNELRELEASE) | |
51 | # version.h: FORCE | |
8ec4b4ff | 52 | # $(call filechk,sample) |
ba97df45 | 53 | # |
8ec4b4ff SR |
54 | # The rule defined shall write to stdout the content of the new file. |
55 | # The existing file will be compared with the new one. | |
56 | # - If no file exist it is created | |
57 | # - If the content differ the new file is used | |
58 | # - If they are equal no change, and no timestamp update | |
8ec4b4ff | 59 | define filechk |
e1f86d7b | 60 | $(check-FORCE) |
88fe89a4 MY |
61 | $(Q)set -e; \ |
62 | mkdir -p $(dir $@); \ | |
63 | trap "rm -f $(dot-target).tmp" EXIT; \ | |
64 | { $(filechk_$(1)); } > $(dot-target).tmp; \ | |
65 | if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \ | |
66 | $(kecho) ' UPD $@'; \ | |
67 | mv -f $(dot-target).tmp $@; \ | |
8ec4b4ff SR |
68 | fi |
69 | endef | |
70 | ||
beda9f3a | 71 | ### |
8ec4b4ff SR |
72 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
73 | # Usage: | |
74 | # $(Q)$(MAKE) $(build)=dir | |
5b2389b4 | 75 | build := -f $(srctree)/scripts/Makefile.build obj |
8ec4b4ff | 76 | |
9fb5e537 RR |
77 | ### |
78 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= | |
79 | # Usage: | |
80 | # $(Q)$(MAKE) $(dtbinst)=dir | |
487c7c77 | 81 | dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj |
9fb5e537 | 82 | |
371fdc77 MY |
83 | ### |
84 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= | |
85 | # Usage: | |
86 | # $(Q)$(MAKE) $(clean)=dir | |
87 | clean := -f $(srctree)/scripts/Makefile.clean obj | |
88 | ||
5de043f4 OV |
89 | # echo command. |
90 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 91 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
92 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
93 | ||
174a1dcc MY |
94 | # sink stdout for 'make -s' |
95 | redirect := | |
96 | quiet_redirect := | |
97 | silent_redirect := exec >/dev/null; | |
98 | ||
5de043f4 | 99 | # printing commands |
174a1dcc | 100 | cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(cmd_$(1)) |
8ec4b4ff SR |
101 | |
102 | ### | |
5de043f4 | 103 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
104 | # target, or command line has changed |
105 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
106 | # including used config symbols | |
107 | # if_changed_rule - as if_changed but execute rule instead | |
cd238eff | 108 | # See Documentation/kbuild/makefiles.rst for more info |
8ec4b4ff SR |
109 | |
110 | ifneq ($(KBUILD_NOCMDDEP),1) | |
50bcca6a | 111 | # Check if both commands are the same including their order. Result is empty |
9c8fa9bc | 112 | # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 |
50bcca6a | 113 | cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ |
9c8fa9bc | 114 | $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) |
c4d5ee13 | 115 | else |
50bcca6a | 116 | cmd-check = $(if $(strip $(cmd_$@)),,1) |
8ec4b4ff SR |
117 | endif |
118 | ||
164f0d2e MM |
119 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file |
120 | # (needed for make) | |
9564a8cf | 121 | # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
164f0d2e MM |
122 | # (needed for make) |
123 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' | |
124 | # (needed for the shell) | |
9564a8cf | 125 | make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
6176aa9a | 126 | |
2d3b1b8f MY |
127 | # Find any prerequisites that are newer than target or that do not exist. |
128 | # (This is not true for now; $? should contain any non-existent prerequisites, | |
129 | # but it does not work as expected when .SECONDARY is present. This seems a bug | |
130 | # of GNU Make.) | |
48f1f058 | 131 | # PHONY targets skipped in both cases. |
eba19032 | 132 | newer-prereqs = $(filter-out $(PHONY),$?) |
48f1f058 | 133 | |
e1f86d7b MY |
134 | # It is a typical mistake to forget the FORCE prerequisite. Check it here so |
135 | # no more breakage will slip in. | |
136 | check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing)) | |
137 | ||
138 | if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE) | |
6796e804 | 139 | |
5de043f4 | 140 | # Execute command if command has changed or prerequisite(s) are updated. |
6796e804 | 141 | if_changed = $(if $(if-changed-cond), \ |
67126965 | 142 | $(cmd); \ |
2aedcd09 | 143 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) |
8ec4b4ff | 144 | |
5de043f4 | 145 | # Execute the command and also postprocess generated .d dependencies file. |
6796e804 | 146 | if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:) |
c1a95fda | 147 | |
e4aca459 | 148 | cmd_and_fixdep = \ |
3a2429e1 | 149 | $(cmd); \ |
392885ee | 150 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ |
e5d28910 | 151 | rm -f $(depfile) |
c1a95fda | 152 | |
8ec4b4ff | 153 | # Usage: $(call if_changed_rule,foo) |
beda9f3a RZ |
154 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
155 | # and if so will execute $(rule_foo). | |
6796e804 | 156 | if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:) |
48f1f058 | 157 | |
45d506bd | 158 | ### |
312a3d09 | 159 | # why - tell why a target got built |
45d506bd SR |
160 | # enabled by make V=2 |
161 | # Output (listed in the order they are checked): | |
162 | # (1) - due to target is PHONY | |
163 | # (2) - due to target missing | |
164 | # (3) - due to: file1.h file2.h | |
165 | # (4) - due to command line change | |
166 | # (5) - due to missing .cmd file | |
167 | # (6) - due to target not in $(targets) | |
168 | # (1) PHONY targets are always build | |
169 | # (2) No target, so we better build it | |
170 | # (3) Prerequisite is newer than target | |
171 | # (4) The command line stored in the file named dir/.target.cmd | |
172 | # differed from actual command line. This happens when compiler | |
173 | # options changes | |
174 | # (5) No dir/.target.cmd file (used to store command line) | |
175 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
176 | # This is a good hint that there is a bug in the kbuild file | |
177 | ifeq ($(KBUILD_VERBOSE),2) | |
178 | why = \ | |
179 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
180 | $(if $(wildcard $@), \ | |
eba19032 | 181 | $(if $(newer-prereqs),- due to: $(newer-prereqs), \ |
50bcca6a | 182 | $(if $(cmd-check), \ |
45d506bd SR |
183 | $(if $(cmd_$@),- due to command line change, \ |
184 | $(if $(filter $@, $(targets)), \ | |
185 | - due to missing .cmd file, \ | |
186 | - due to $(notdir $@) not in $$(targets) \ | |
187 | ) \ | |
188 | ) \ | |
189 | ) \ | |
190 | ), \ | |
191 | - due to target missing \ | |
192 | ) \ | |
193 | ) | |
194 | ||
195 | echo-why = $(call escsq, $(strip $(why))) | |
196 | endif | |
3ee550f1 | 197 | |
3ee550f1 | 198 | ############################################################################### |
9c2af1c7 MY |
199 | |
200 | # delete partially updated (i.e. corrupted) files on error | |
201 | .DELETE_ON_ERROR: | |
8e9b61b2 MY |
202 | |
203 | # do not delete intermediate files automatically | |
204 | .SECONDARY: |