| | 1 | # SPDX-License-Identifier: GPL-2.0 |
| | 2 | #### |
| | 3 | # kbuild: Generic definitions |
| | 4 | |
| | 5 | # Convenient variables |
| | 6 | comma := , |
| | 7 | quote := " |
| | 8 | squote := ' |
| | 9 | empty := |
| | 10 | space := $(empty) $(empty) |
| | 11 | space_escape := _-_SPACE_-_ |
| | 12 | pound := \# |
| | 13 | |
| | 14 | ### |
| | 15 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o |
| | 16 | dot-target = $(dir $@).$(notdir $@) |
| | 17 | |
| | 18 | ### |
| | 19 | # The temporary file to save gcc -MD generated dependencies must not |
| | 20 | # contain a comma |
| | 21 | depfile = $(subst $(comma),_,$(dot-target).d) |
| | 22 | |
| | 23 | ### |
| | 24 | # filename of target with directory and extension stripped |
| | 25 | basetarget = $(basename $(notdir $@)) |
| | 26 | |
| | 27 | ### |
| | 28 | # real prerequisites without phony targets |
| | 29 | real-prereqs = $(filter-out $(PHONY), $^) |
| | 30 | |
| | 31 | ### |
| | 32 | # Escape single quote for use in echo statements |
| | 33 | escsq = $(subst $(squote),'\$(squote)',$1) |
| | 34 | |
| | 35 | ### |
| | 36 | # Easy method for doing a status message |
| | 37 | kecho := : |
| | 38 | quiet_kecho := echo |
| | 39 | silent_kecho := : |
| | 40 | kecho := $($(quiet)kecho) |
| | 41 | |
| | 42 | ### |
| | 43 | # filechk is used to check if the content of a generated file is updated. |
| | 44 | # Sample usage: |
| | 45 | # |
| | 46 | # filechk_sample = echo $(KERNELRELEASE) |
| | 47 | # version.h: FORCE |
| | 48 | # $(call filechk,sample) |
| | 49 | # |
| | 50 | # The rule defined shall write to stdout the content of the new file. |
| | 51 | # The existing file will be compared with the new one. |
| | 52 | # - If no file exist it is created |
| | 53 | # - If the content differ the new file is used |
| | 54 | # - If they are equal no change, and no timestamp update |
| | 55 | # - stdin is piped in from the first prerequisite ($<) so one has |
| | 56 | # to specify a valid file as first prerequisite (often the kbuild file) |
| | 57 | define filechk |
| | 58 | $(Q)set -e; \ |
| | 59 | mkdir -p $(dir $@); \ |
| | 60 | { $(filechk_$(1)); } > $@.tmp; \ |
| | 61 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
| | 62 | rm -f $@.tmp; \ |
| | 63 | else \ |
| | 64 | $(kecho) ' UPD $@'; \ |
| | 65 | mv -f $@.tmp $@; \ |
| | 66 | fi |
| | 67 | endef |
| | 68 | |
| | 69 | ###### |
| | 70 | # gcc support functions |
| | 71 | # See documentation in Documentation/kbuild/makefiles.rst |
| | 72 | |
| | 73 | # cc-cross-prefix |
| | 74 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
| | 75 | # Return first <prefix> where a <prefix>gcc is found in PATH. |
| | 76 | # If no gcc found in PATH with listed prefixes return nothing |
| | 77 | # |
| | 78 | # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it |
| | 79 | # would try to directly execute the shell builtin 'command'. This workaround |
| | 80 | # should be kept for a long time since this issue was fixed only after the |
| | 81 | # GNU Make 4.2.1 release. |
| | 82 | cc-cross-prefix = $(firstword $(foreach c, $(1), \ |
| | 83 | $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) |
| | 84 | |
| | 85 | # output directory for tests below |
| | 86 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) |
| | 87 | |
| | 88 | # try-run |
| | 89 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) |
| | 90 | # Exit code chooses option. "$$TMP" serves as a temporary file and is |
| | 91 | # automatically cleaned up. |
| | 92 | try-run = $(shell set -e; \ |
| | 93 | TMP="$(TMPOUT).$$$$.tmp"; \ |
| | 94 | TMPO="$(TMPOUT).$$$$.o"; \ |
| | 95 | if ($(1)) >/dev/null 2>&1; \ |
| | 96 | then echo "$(2)"; \ |
| | 97 | else echo "$(3)"; \ |
| | 98 | fi; \ |
| | 99 | rm -f "$$TMP" "$$TMPO") |
| | 100 | |
| | 101 | # as-option |
| | 102 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
| | 103 | |
| | 104 | as-option = $(call try-run,\ |
| | 105 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) |
| | 106 | |
| | 107 | # as-instr |
| | 108 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
| | 109 | |
| | 110 | as-instr = $(call try-run,\ |
| | 111 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
| | 112 | |
| | 113 | # __cc-option |
| | 114 | # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) |
| | 115 | __cc-option = $(call try-run,\ |
| | 116 | $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) |
| | 117 | |
| | 118 | # Do not attempt to build with gcc plugins during cc-option tests. |
| | 119 | # (And this uses delayed resolution so the flags will be up to date.) |
| | 120 | CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) |
| | 121 | |
| | 122 | # cc-option |
| | 123 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
| | 124 | |
| | 125 | cc-option = $(call __cc-option, $(CC),\ |
| | 126 | $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2)) |
| | 127 | |
| | 128 | # cc-option-yn |
| | 129 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
| | 130 | cc-option-yn = $(call try-run,\ |
| | 131 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
| | 132 | |
| | 133 | # cc-disable-warning |
| | 134 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
| | 135 | cc-disable-warning = $(call try-run,\ |
| | 136 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
| | 137 | |
| | 138 | # cc-ifversion |
| | 139 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
| | 140 | cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) |
| | 141 | |
| | 142 | # ld-option |
| | 143 | # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) |
| | 144 | ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) |
| | 145 | |
| | 146 | # ld-version |
| | 147 | # Note this is mainly for HJ Lu's 3 number binutil versions |
| | 148 | ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) |
| | 149 | |
| | 150 | # ld-ifversion |
| | 151 | # Usage: $(call ld-ifversion, -ge, 22252, y) |
| | 152 | ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) |
| | 153 | |
| | 154 | ###### |
| | 155 | |
| | 156 | ### |
| | 157 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
| | 158 | # Usage: |
| | 159 | # $(Q)$(MAKE) $(build)=dir |
| | 160 | build := -f $(srctree)/scripts/Makefile.build obj |
| | 161 | |
| | 162 | ### |
| | 163 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= |
| | 164 | # Usage: |
| | 165 | # $(Q)$(MAKE) $(modbuiltin)=dir |
| | 166 | modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj |
| | 167 | |
| | 168 | ### |
| | 169 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= |
| | 170 | # Usage: |
| | 171 | # $(Q)$(MAKE) $(dtbinst)=dir |
| | 172 | dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj |
| | 173 | |
| | 174 | ### |
| | 175 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= |
| | 176 | # Usage: |
| | 177 | # $(Q)$(MAKE) $(clean)=dir |
| | 178 | clean := -f $(srctree)/scripts/Makefile.clean obj |
| | 179 | |
| | 180 | # echo command. |
| | 181 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
| | 182 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
| | 183 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
| | 184 | |
| | 185 | # printing commands |
| | 186 | cmd = @set -e; $(echo-cmd) $(cmd_$(1)) |
| | 187 | |
| | 188 | ### |
| | 189 | # if_changed - execute command if any prerequisite is newer than |
| | 190 | # target, or command line has changed |
| | 191 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
| | 192 | # including used config symbols |
| | 193 | # if_changed_rule - as if_changed but execute rule instead |
| | 194 | # See Documentation/kbuild/makefiles.rst for more info |
| | 195 | |
| | 196 | ifneq ($(KBUILD_NOCMDDEP),1) |
| | 197 | # Check if both commands are the same including their order. Result is empty |
| | 198 | # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 |
| | 199 | cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ |
| | 200 | $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) |
| | 201 | else |
| | 202 | cmd-check = $(if $(strip $(cmd_$@)),,1) |
| | 203 | endif |
| | 204 | |
| | 205 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file |
| | 206 | # (needed for make) |
| | 207 | # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
| | 208 | # (needed for make) |
| | 209 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' |
| | 210 | # (needed for the shell) |
| | 211 | make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
| | 212 | |
| | 213 | # Find any prerequisites that is newer than target or that does not exist. |
| | 214 | # PHONY targets skipped in both cases. |
| | 215 | any-prereq = $(filter-out $(PHONY),$?)$(filter-out $(PHONY) $(wildcard $^),$^) |
| | 216 | |
| | 217 | # Execute command if command has changed or prerequisite(s) are updated. |
| | 218 | if_changed = $(if $(any-prereq)$(cmd-check), \ |
| | 219 | $(cmd); \ |
| | 220 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) |
| | 221 | |
| | 222 | # Execute the command and also postprocess generated .d dependencies file. |
| | 223 | if_changed_dep = $(if $(any-prereq)$(cmd-check),$(cmd_and_fixdep),@:) |
| | 224 | |
| | 225 | cmd_and_fixdep = \ |
| | 226 | $(cmd); \ |
| | 227 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ |
| | 228 | rm -f $(depfile) |
| | 229 | |
| | 230 | # Usage: $(call if_changed_rule,foo) |
| | 231 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
| | 232 | # and if so will execute $(rule_foo). |
| | 233 | if_changed_rule = $(if $(any-prereq)$(cmd-check),$(rule_$(1)),@:) |
| | 234 | |
| | 235 | ### |
| | 236 | # why - tell why a target got built |
| | 237 | # enabled by make V=2 |
| | 238 | # Output (listed in the order they are checked): |
| | 239 | # (1) - due to target is PHONY |
| | 240 | # (2) - due to target missing |
| | 241 | # (3) - due to: file1.h file2.h |
| | 242 | # (4) - due to command line change |
| | 243 | # (5) - due to missing .cmd file |
| | 244 | # (6) - due to target not in $(targets) |
| | 245 | # (1) PHONY targets are always build |
| | 246 | # (2) No target, so we better build it |
| | 247 | # (3) Prerequisite is newer than target |
| | 248 | # (4) The command line stored in the file named dir/.target.cmd |
| | 249 | # differed from actual command line. This happens when compiler |
| | 250 | # options changes |
| | 251 | # (5) No dir/.target.cmd file (used to store command line) |
| | 252 | # (6) No dir/.target.cmd file and target not listed in $(targets) |
| | 253 | # This is a good hint that there is a bug in the kbuild file |
| | 254 | ifeq ($(KBUILD_VERBOSE),2) |
| | 255 | why = \ |
| | 256 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ |
| | 257 | $(if $(wildcard $@), \ |
| | 258 | $(if $(any-prereq),- due to: $(any-prereq), \ |
| | 259 | $(if $(cmd-check), \ |
| | 260 | $(if $(cmd_$@),- due to command line change, \ |
| | 261 | $(if $(filter $@, $(targets)), \ |
| | 262 | - due to missing .cmd file, \ |
| | 263 | - due to $(notdir $@) not in $$(targets) \ |
| | 264 | ) \ |
| | 265 | ) \ |
| | 266 | ) \ |
| | 267 | ), \ |
| | 268 | - due to target missing \ |
| | 269 | ) \ |
| | 270 | ) |
| | 271 | |
| | 272 | echo-why = $(call escsq, $(strip $(why))) |
| | 273 | endif |
| | 274 | |
| | 275 | ############################################################################### |
| | 276 | # |
| | 277 | # When a Kconfig string contains a filename, it is suitable for |
| | 278 | # passing to shell commands. It is surrounded by double-quotes, and |
| | 279 | # any double-quotes or backslashes within it are escaped by |
| | 280 | # backslashes. |
| | 281 | # |
| | 282 | # This is no use for dependencies or $(wildcard). We need to strip the |
| | 283 | # surrounding quotes and the escaping from quotes and backslashes, and |
| | 284 | # we *do* need to escape any spaces in the string. So, for example: |
| | 285 | # |
| | 286 | # Usage: $(eval $(call config_filename,FOO)) |
| | 287 | # |
| | 288 | # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, |
| | 289 | # transformed as described above to be suitable for use within the |
| | 290 | # makefile. |
| | 291 | # |
| | 292 | # Also, if the filename is a relative filename and exists in the source |
| | 293 | # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to |
| | 294 | # be prefixed to *both* command invocation and dependencies. |
| | 295 | # |
| | 296 | # Note: We also print the filenames in the quiet_cmd_foo text, and |
| | 297 | # perhaps ought to have a version specially escaped for that purpose. |
| | 298 | # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good |
| | 299 | # enough. It'll strip the quotes in the common case where there's no |
| | 300 | # space and it's a simple filename, and it'll retain the quotes when |
| | 301 | # there's a space. There are some esoteric cases in which it'll print |
| | 302 | # the wrong thing, but we don't really care. The actual dependencies |
| | 303 | # and commands *do* get it right, with various combinations of single |
| | 304 | # and double quotes, backslashes and spaces in the filenames. |
| | 305 | # |
| | 306 | ############################################################################### |
| | 307 | # |
| | 308 | define config_filename |
| | 309 | ifneq ($$(CONFIG_$(1)),"") |
| | 310 | $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) |
| | 311 | ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) |
| | 312 | else |
| | 313 | ifeq ($$(wildcard $$($(1)_FILENAME)),) |
| | 314 | ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) |
| | 315 | $(1)_SRCPREFIX := $(srctree)/ |
| | 316 | endif |
| | 317 | endif |
| | 318 | endif |
| | 319 | endif |
| | 320 | endef |
| | 321 | # |
| | 322 | ############################################################################### |
| | 323 | |
| | 324 | # delete partially updated (i.e. corrupted) files on error |
| | 325 | .DELETE_ON_ERROR: |
| | 326 | |
| | 327 | # do not delete intermediate files automatically |
| | 328 | .SECONDARY: |
projects / linux-2.6-block.git / blame_incremental