1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0 2 #### 2 #### 3 # kbuild: Generic definitions 3 # kbuild: Generic definitions 4 4 5 # Convenient variables 5 # Convenient variables 6 comma := , 6 comma := , 7 quote := " 7 quote := " 8 squote := ' 8 squote := ' 9 empty := 9 empty := 10 space := $(empty) $(empty) 10 space := $(empty) $(empty) 11 space_escape := _-_SPACE_-_ 11 space_escape := _-_SPACE_-_ 12 pound := \# 12 pound := \# 13 define newline 13 define newline 14 14 15 15 16 endef 16 endef 17 17 18 ### 18 ### 19 # Comparison macros. 19 # Comparison macros. 20 # Usage: $(call test-lt, $(CONFIG_LLD_VERSION) 20 # Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000) 21 # 21 # 22 # Use $(intcmp ...) if supported. (Make >= 4.4 22 # Use $(intcmp ...) if supported. (Make >= 4.4) 23 # Otherwise, fall back to the 'test' shell com 23 # Otherwise, fall back to the 'test' shell command. 24 ifeq ($(intcmp 1,0,,,y),y) 24 ifeq ($(intcmp 1,0,,,y),y) 25 test-ge = $(intcmp $(strip $1)0, $(strip $2)0, 25 test-ge = $(intcmp $(strip $1)0, $(strip $2)0,,y,y) 26 test-gt = $(intcmp $(strip $1)0, $(strip $2)0, 26 test-gt = $(intcmp $(strip $1)0, $(strip $2)0,,,y) 27 else 27 else 28 test-ge = $(shell test $(strip $1)0 -ge $(stri 28 test-ge = $(shell test $(strip $1)0 -ge $(strip $2)0 && echo y) 29 test-gt = $(shell test $(strip $1)0 -gt $(stri 29 test-gt = $(shell test $(strip $1)0 -gt $(strip $2)0 && echo y) 30 endif 30 endif 31 test-le = $(call test-ge, $2, $1) 31 test-le = $(call test-ge, $2, $1) 32 test-lt = $(call test-gt, $2, $1) 32 test-lt = $(call test-gt, $2, $1) 33 33 34 ### 34 ### 35 # Name of target with a '.' as filename prefix 35 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o 36 dot-target = $(dir $@).$(notdir $@) 36 dot-target = $(dir $@).$(notdir $@) 37 37 38 ### 38 ### 39 # Name of target with a '.tmp_' as filename pr 39 # Name of target with a '.tmp_' as filename prefix. foo/bar.o => foo/.tmp_bar.o 40 tmp-target = $(dir $@).tmp_$(notdir $@) 40 tmp-target = $(dir $@).tmp_$(notdir $@) 41 41 42 ### 42 ### 43 # The temporary file to save gcc -MMD generate 43 # The temporary file to save gcc -MMD generated dependencies must not 44 # contain a comma 44 # contain a comma 45 depfile = $(subst $(comma),_,$(dot-target).d) 45 depfile = $(subst $(comma),_,$(dot-target).d) 46 46 47 ### 47 ### 48 # filename of target with directory and extens 48 # filename of target with directory and extension stripped 49 basetarget = $(basename $(notdir $@)) 49 basetarget = $(basename $(notdir $@)) 50 50 51 ### 51 ### 52 # real prerequisites without phony targets 52 # real prerequisites without phony targets 53 real-prereqs = $(filter-out $(PHONY), $^) 53 real-prereqs = $(filter-out $(PHONY), $^) 54 54 55 ### 55 ### 56 # Escape single quote for use in echo statemen 56 # Escape single quote for use in echo statements 57 escsq = $(subst $(squote),'\$(squote)',$1) 57 escsq = $(subst $(squote),'\$(squote)',$1) 58 58 59 ### 59 ### 60 # Quote a string to pass it to C files. foo => 60 # Quote a string to pass it to C files. foo => '"foo"' 61 stringify = $(squote)$(quote)$1$(quote)$(squot 61 stringify = $(squote)$(quote)$1$(quote)$(squote) 62 62 63 ### 63 ### 64 # The path to Kbuild or Makefile. Kbuild has p 64 # The path to Kbuild or Makefile. Kbuild has precedence over Makefile. 65 kbuild-file = $(or $(wildcard $(src)/Kbuild),$ !! 65 kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) >> 66 kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile) 66 67 67 ### 68 ### 68 # Read a file, replacing newlines with spaces 69 # Read a file, replacing newlines with spaces 69 # 70 # 70 # Make 4.2 or later can read a file by using i 71 # Make 4.2 or later can read a file by using its builtin function. 71 ifneq ($(filter-out 4.0 4.1, $(MAKE_VERSION)), !! 72 ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),) 72 read-file = $(subst $(newline),$(space),$(file 73 read-file = $(subst $(newline),$(space),$(file < $1)) 73 else 74 else 74 read-file = $(shell cat $1 2>/dev/null) 75 read-file = $(shell cat $1 2>/dev/null) 75 endif 76 endif 76 77 77 ### 78 ### 78 # Easy method for doing a status message 79 # Easy method for doing a status message 79 kecho := : 80 kecho := : 80 quiet_kecho := echo 81 quiet_kecho := echo 81 silent_kecho := : 82 silent_kecho := : 82 kecho := $($(quiet)kecho) 83 kecho := $($(quiet)kecho) 83 84 84 ### 85 ### 85 # filechk is used to check if the content of a 86 # filechk is used to check if the content of a generated file is updated. 86 # Sample usage: 87 # Sample usage: 87 # 88 # 88 # filechk_sample = echo $(KERNELRELEASE) 89 # filechk_sample = echo $(KERNELRELEASE) 89 # version.h: FORCE 90 # version.h: FORCE 90 # $(call filechk,sample) 91 # $(call filechk,sample) 91 # 92 # 92 # The rule defined shall write to stdout the c 93 # The rule defined shall write to stdout the content of the new file. 93 # The existing file will be compared with the 94 # The existing file will be compared with the new one. 94 # - If no file exist it is created 95 # - If no file exist it is created 95 # - If the content differ the new file is used 96 # - If the content differ the new file is used 96 # - If they are equal no change, and no timest 97 # - If they are equal no change, and no timestamp update 97 define filechk 98 define filechk 98 $(check-FORCE) 99 $(check-FORCE) 99 $(Q)set -e; 100 $(Q)set -e; \ 100 mkdir -p $(dir $@); 101 mkdir -p $(dir $@); \ 101 trap "rm -f $(tmp-target)" EXIT; !! 102 trap "rm -f $(dot-target).tmp" EXIT; \ 102 { $(filechk_$(1)); } > $(tmp-target); !! 103 { $(filechk_$(1)); } > $(dot-target).tmp; \ 103 if [ ! -r $@ ] || ! cmp -s $@ $(tmp-ta !! 104 if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \ 104 $(kecho) ' UPD $@'; 105 $(kecho) ' UPD $@'; \ 105 mv -f $(tmp-target) $@; !! 106 mv -f $(dot-target).tmp $@; \ 106 fi 107 fi 107 endef 108 endef 108 109 109 ### 110 ### 110 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 111 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= 111 # Usage: 112 # Usage: 112 # $(Q)$(MAKE) $(build)=dir 113 # $(Q)$(MAKE) $(build)=dir 113 build := -f $(srctree)/scripts/Makefile.build 114 build := -f $(srctree)/scripts/Makefile.build obj 114 115 115 ### 116 ### >> 117 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= >> 118 # Usage: >> 119 # $(Q)$(MAKE) $(dtbinst)=dir >> 120 dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj >> 121 >> 122 ### 116 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 123 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= 117 # Usage: 124 # Usage: 118 # $(Q)$(MAKE) $(clean)=dir 125 # $(Q)$(MAKE) $(clean)=dir 119 clean := -f $(srctree)/scripts/Makefile.clean 126 clean := -f $(srctree)/scripts/Makefile.clean obj 120 127 121 # pring log !! 128 # echo command. 122 # !! 129 # Short version is used, if $(quiet) equals `quiet_', otherwise full one. 123 # If quiet is "silent_", print nothing and sin !! 130 echo-cmd = $(if $($(quiet)cmd_$(1)),\ 124 # If quiet is "quiet_", print short log !! 131 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) 125 # If quiet is empty, print short log and whole !! 132 126 silent_log_print = exec >/dev/null; !! 133 # sink stdout for 'make -s' 127 quiet_log_print = $(if $(quiet_cmd_$1), echo !! 134 redirect := 128 log_print = echo '$(pound) $(call escsq !! 135 quiet_redirect := 129 echo ' $(call escsq,$(cmd_ !! 136 silent_redirect := exec >/dev/null; 130 137 131 # Delete the target on interruption 138 # Delete the target on interruption 132 # 139 # 133 # GNU Make automatically deletes the target if 140 # GNU Make automatically deletes the target if it has already been changed by 134 # the interrupted recipe. So, you can safely s 141 # the interrupted recipe. So, you can safely stop the build by Ctrl-C (Make 135 # will delete incomplete targets), and resume 142 # will delete incomplete targets), and resume it later. 136 # 143 # 137 # However, this does not work when the stderr 144 # However, this does not work when the stderr is piped to another program, like 138 # $ make >&2 | tee log 145 # $ make >&2 | tee log 139 # Make dies with SIGPIPE before cleaning the t 146 # Make dies with SIGPIPE before cleaning the targets. 140 # 147 # 141 # To address it, we clean the target in signal 148 # To address it, we clean the target in signal traps. 142 # 149 # 143 # Make deletes the target when it catches SIGH 150 # Make deletes the target when it catches SIGHUP, SIGINT, SIGQUIT, SIGTERM. 144 # So, we cover them, and also SIGPIPE just in 151 # So, we cover them, and also SIGPIPE just in case. 145 # 152 # 146 # Of course, this is unneeded for phony target 153 # Of course, this is unneeded for phony targets. 147 delete-on-interrupt = \ 154 delete-on-interrupt = \ 148 $(if $(filter-out $(PHONY), $@), \ 155 $(if $(filter-out $(PHONY), $@), \ 149 $(foreach sig, HUP INT QUIT TE 156 $(foreach sig, HUP INT QUIT TERM PIPE, \ 150 trap 'rm -f $@; trap - 157 trap 'rm -f $@; trap - $(sig); kill -s $(sig) $$$$' $(sig);)) 151 158 152 # print and execute commands !! 159 # printing commands 153 cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_ !! 160 cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(delete-on-interrupt) $(cmd_$(1)) 154 161 155 ### 162 ### 156 # if_changed - execute command if any pre 163 # if_changed - execute command if any prerequisite is newer than 157 # target, or command line ha 164 # target, or command line has changed 158 # if_changed_dep - as if_changed, but uses fi 165 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies 159 # including used config symb 166 # including used config symbols 160 # if_changed_rule - as if_changed but execute 167 # if_changed_rule - as if_changed but execute rule instead 161 # See Documentation/kbuild/makefiles.rst for m 168 # See Documentation/kbuild/makefiles.rst for more info 162 169 163 ifneq ($(KBUILD_NOCMDDEP),1) 170 ifneq ($(KBUILD_NOCMDDEP),1) 164 # Check if both commands are the same includin 171 # Check if both commands are the same including their order. Result is empty 165 # string if equal. User may override this chec 172 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 166 # If the target does not exist, the *.cmd file !! 173 cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ 167 # $(savedcmd_$@) gets empty. Then, target will << 168 # happens to become empty. << 169 cmd-check = $(filter-out $(subst $(space),$(sp << 170 $(subst $(space),$(sp 174 $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) 171 else 175 else 172 # We still need to detect missing targets. !! 176 cmd-check = $(if $(strip $(cmd_$@)),,1) 173 cmd-check = $(if $(strip $(savedcmd_$@)),,1) << 174 endif 177 endif 175 178 176 # Replace >$< with >$$< to preserve $ when rel 179 # Replace >$< with >$$< to preserve $ when reloading the .cmd file 177 # (needed for make) 180 # (needed for make) 178 # Replace >#< with >$(pound)< to avoid startin 181 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file 179 # (needed for make) 182 # (needed for make) 180 # Replace >'< with >'\''< to be able to enclos 183 # Replace >'< with >'\''< to be able to enclose the whole string in '...' 181 # (needed for the shell) 184 # (needed for the shell) 182 make-cmd = $(call escsq,$(subst $(pound),$$(po 185 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) 183 186 184 # Find any prerequisites that are newer than t 187 # Find any prerequisites that are newer than target or that do not exist. 185 # PHONY targets skipped in both cases. 188 # PHONY targets skipped in both cases. 186 # If there is no prerequisite other than phony << 187 # empty even if the target does not exist. cmd << 188 newer-prereqs = $(filter-out $(PHONY),$?) 189 newer-prereqs = $(filter-out $(PHONY),$?) 189 190 190 # It is a typical mistake to forget the FORCE 191 # It is a typical mistake to forget the FORCE prerequisite. Check it here so 191 # no more breakage will slip in. 192 # no more breakage will slip in. 192 check-FORCE = $(if $(filter FORCE, $^),,$(warn 193 check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing)) 193 194 194 if-changed-cond = $(newer-prereqs)$(cmd-check) 195 if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE) 195 196 196 # Execute command if command has changed or pr 197 # Execute command if command has changed or prerequisite(s) are updated. 197 if_changed = $(if $(if-changed-cond),$(cmd_and 198 if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:) 198 199 199 cmd_and_savecmd = 200 cmd_and_savecmd = \ 200 $(cmd); 201 $(cmd); \ 201 printf '%s\n' 'savedcmd_$@ := $(make-c !! 202 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd 202 203 203 # Execute the command and also postprocess gen 204 # Execute the command and also postprocess generated .d dependencies file. 204 if_changed_dep = $(if $(if-changed-cond),$(cmd 205 if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:) 205 206 206 cmd_and_fixdep = 207 cmd_and_fixdep = \ 207 $(cmd); 208 $(cmd); \ 208 scripts/basic/fixdep $(depfile) $@ '$( 209 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ 209 rm -f $(depfile) 210 rm -f $(depfile) 210 211 211 # Usage: $(call if_changed_rule,foo) 212 # Usage: $(call if_changed_rule,foo) 212 # Will check if $(cmd_foo) or any of the prere 213 # Will check if $(cmd_foo) or any of the prerequisites changed, 213 # and if so will execute $(rule_foo). 214 # and if so will execute $(rule_foo). 214 if_changed_rule = $(if $(if-changed-cond),$(ru 215 if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:) 215 216 216 ### 217 ### 217 # why - tell why a target got built 218 # why - tell why a target got built 218 # enabled by make V=2 219 # enabled by make V=2 219 # Output (listed in the order they are c 220 # Output (listed in the order they are checked): 220 # (1) - due to target is PHONY 221 # (1) - due to target is PHONY 221 # (2) - due to target missing 222 # (2) - due to target missing 222 # (3) - due to: file1.h file2.h 223 # (3) - due to: file1.h file2.h 223 # (4) - due to command line change 224 # (4) - due to command line change 224 # (5) - due to missing .cmd file 225 # (5) - due to missing .cmd file 225 # (6) - due to target not in $(target 226 # (6) - due to target not in $(targets) 226 # (1) PHONY targets are always build 227 # (1) PHONY targets are always build 227 # (2) No target, so we better build it 228 # (2) No target, so we better build it 228 # (3) Prerequisite is newer than target 229 # (3) Prerequisite is newer than target 229 # (4) The command line stored in the file name 230 # (4) The command line stored in the file named dir/.target.cmd 230 # differed from actual command line. This 231 # differed from actual command line. This happens when compiler 231 # options changes 232 # options changes 232 # (5) No dir/.target.cmd file (used to store c 233 # (5) No dir/.target.cmd file (used to store command line) 233 # (6) No dir/.target.cmd file and target not l 234 # (6) No dir/.target.cmd file and target not listed in $(targets) 234 # This is a good hint that there is a bug 235 # This is a good hint that there is a bug in the kbuild file 235 ifneq ($(findstring 2, $(KBUILD_VERBOSE)),) !! 236 ifeq ($(KBUILD_VERBOSE),2) 236 _why = !! 237 why = \ 237 $(if $(filter $@, $(PHONY)),- due to targe 238 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ 238 $(if $(wildcard $@), 239 $(if $(wildcard $@), \ 239 $(if $(newer-prereqs),- due to: $( 240 $(if $(newer-prereqs),- due to: $(newer-prereqs), \ 240 $(if $(cmd-check), 241 $(if $(cmd-check), \ 241 $(if $(savedcmd_$@),- due !! 242 $(if $(cmd_$@),- due to command line change, \ 242 $(if $(filter $@, $(ta 243 $(if $(filter $@, $(targets)), \ 243 - due to missing . 244 - due to missing .cmd file, \ 244 - due to $(notdir 245 - due to $(notdir $@) not in $$(targets) \ 245 ) 246 ) \ 246 ) 247 ) \ 247 ) 248 ) \ 248 ), 249 ), \ 249 - due to target missing 250 - due to target missing \ 250 ) 251 ) \ 251 ) 252 ) 252 253 253 why = $(space)$(strip $(_why)) !! 254 echo-why = $(call escsq, $(strip $(why))) 254 endif 255 endif 255 256 256 ############################################## 257 ############################################################################### 257 258 258 # delete partially updated (i.e. corrupted) fi 259 # delete partially updated (i.e. corrupted) files on error 259 .DELETE_ON_ERROR: 260 .DELETE_ON_ERROR: 260 261 261 # do not delete intermediate files automatical 262 # do not delete intermediate files automatically 262 # 263 # 263 # .NOTINTERMEDIATE is more correct, but only a 264 # .NOTINTERMEDIATE is more correct, but only available on newer Make versions. 264 # Make 4.4 introduced .NOTINTERMEDIATE, and it 265 # Make 4.4 introduced .NOTINTERMEDIATE, and it appears in .FEATURES, but the 265 # global .NOTINTERMEDIATE does not work. We ca 266 # global .NOTINTERMEDIATE does not work. We can use it on Make > 4.4. 266 # Use .SECONDARY for older Make versions, but 267 # Use .SECONDARY for older Make versions, but "newer-prereq" cannot detect 267 # deleted files. 268 # deleted files. 268 ifneq ($(and $(filter notintermediate, $(.FEAT 269 ifneq ($(and $(filter notintermediate, $(.FEATURES)),$(filter-out 4.4,$(MAKE_VERSION))),) 269 .NOTINTERMEDIATE: 270 .NOTINTERMEDIATE: 270 else 271 else 271 .SECONDARY: 272 .SECONDARY: 272 endif 273 endif
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