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251 lines
9.3 KiB
251 lines
9.3 KiB
# SPDX-License-Identifier: GPL-2.0 |
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#### |
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# kbuild: Generic definitions |
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# Convenient variables |
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comma := , |
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quote := " |
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squote := ' |
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empty := |
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space := $(empty) $(empty) |
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space_escape := _-_SPACE_-_ |
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pound := \# |
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### |
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# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o |
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dot-target = $(dir $@).$(notdir $@) |
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### |
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# The temporary file to save gcc -MMD generated dependencies must not |
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# contain a comma |
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depfile = $(subst $(comma),_,$(dot-target).d) |
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### |
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# filename of target with directory and extension stripped |
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basetarget = $(basename $(notdir $@)) |
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### |
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# real prerequisites without phony targets |
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real-prereqs = $(filter-out $(PHONY), $^) |
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### |
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# Escape single quote for use in echo statements |
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escsq = $(subst $(squote),'\$(squote)',$1) |
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### |
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# Quote a string to pass it to C files. foo => '"foo"' |
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stringify = $(squote)$(quote)$1$(quote)$(squote) |
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### |
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# Easy method for doing a status message |
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kecho := : |
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quiet_kecho := echo |
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silent_kecho := : |
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kecho := $($(quiet)kecho) |
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### |
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# filechk is used to check if the content of a generated file is updated. |
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# Sample usage: |
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# |
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# filechk_sample = echo $(KERNELRELEASE) |
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# version.h: FORCE |
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# $(call filechk,sample) |
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# |
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# The rule defined shall write to stdout the content of the new file. |
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# The existing file will be compared with the new one. |
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# - If no file exist it is created |
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# - If the content differ the new file is used |
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# - If they are equal no change, and no timestamp update |
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define filechk |
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$(check-FORCE) |
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$(Q)set -e; \ |
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mkdir -p $(dir $@); \ |
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trap "rm -f $(dot-target).tmp" EXIT; \ |
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{ $(filechk_$(1)); } > $(dot-target).tmp; \ |
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if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \ |
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$(kecho) ' UPD $@'; \ |
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mv -f $(dot-target).tmp $@; \ |
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fi |
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endef |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
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# Usage: |
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# $(Q)$(MAKE) $(build)=dir |
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build := -f $(srctree)/scripts/Makefile.build obj |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= |
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# Usage: |
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# $(Q)$(MAKE) $(dtbinst)=dir |
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dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj |
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### |
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= |
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# Usage: |
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# $(Q)$(MAKE) $(clean)=dir |
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clean := -f $(srctree)/scripts/Makefile.clean obj |
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# echo command. |
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# Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
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echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
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echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
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# sink stdout for 'make -s' |
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redirect := |
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quiet_redirect := |
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silent_redirect := exec >/dev/null; |
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# printing commands |
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cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(cmd_$(1)) |
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### |
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# if_changed - execute command if any prerequisite is newer than |
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# target, or command line has changed |
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# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
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# including used config symbols |
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# if_changed_rule - as if_changed but execute rule instead |
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# See Documentation/kbuild/makefiles.rst for more info |
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ifneq ($(KBUILD_NOCMDDEP),1) |
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# Check if both commands are the same including their order. Result is empty |
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# string if equal. User may override this check using make KBUILD_NOCMDDEP=1 |
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cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ |
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$(subst $(space),$(space_escape),$(strip $(cmd_$1)))) |
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else |
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cmd-check = $(if $(strip $(cmd_$@)),,1) |
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endif |
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# Replace >$< with >$$< to preserve $ when reloading the .cmd file |
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# (needed for make) |
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# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
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# (needed for make) |
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# Replace >'< with >'\''< to be able to enclose the whole string in '...' |
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# (needed for the shell) |
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make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
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# Find any prerequisites that are newer than target or that do not exist. |
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# (This is not true for now; $? should contain any non-existent prerequisites, |
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# but it does not work as expected when .SECONDARY is present. This seems a bug |
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# of GNU Make.) |
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# PHONY targets skipped in both cases. |
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newer-prereqs = $(filter-out $(PHONY),$?) |
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# It is a typical mistake to forget the FORCE prerequisite. Check it here so |
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# no more breakage will slip in. |
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check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing)) |
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if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE) |
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# Execute command if command has changed or prerequisite(s) are updated. |
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if_changed = $(if $(if-changed-cond), \ |
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$(cmd); \ |
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printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) |
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# Execute the command and also postprocess generated .d dependencies file. |
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if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:) |
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cmd_and_fixdep = \ |
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$(cmd); \ |
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scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ |
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rm -f $(depfile) |
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# Usage: $(call if_changed_rule,foo) |
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# Will check if $(cmd_foo) or any of the prerequisites changed, |
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# and if so will execute $(rule_foo). |
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if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:) |
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### |
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# why - tell why a target got built |
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# enabled by make V=2 |
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# Output (listed in the order they are checked): |
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# (1) - due to target is PHONY |
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# (2) - due to target missing |
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# (3) - due to: file1.h file2.h |
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# (4) - due to command line change |
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# (5) - due to missing .cmd file |
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# (6) - due to target not in $(targets) |
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# (1) PHONY targets are always build |
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# (2) No target, so we better build it |
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# (3) Prerequisite is newer than target |
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# (4) The command line stored in the file named dir/.target.cmd |
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# differed from actual command line. This happens when compiler |
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# options changes |
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# (5) No dir/.target.cmd file (used to store command line) |
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# (6) No dir/.target.cmd file and target not listed in $(targets) |
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# This is a good hint that there is a bug in the kbuild file |
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ifeq ($(KBUILD_VERBOSE),2) |
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why = \ |
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$(if $(filter $@, $(PHONY)),- due to target is PHONY, \ |
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$(if $(wildcard $@), \ |
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$(if $(newer-prereqs),- due to: $(newer-prereqs), \ |
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$(if $(cmd-check), \ |
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$(if $(cmd_$@),- due to command line change, \ |
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$(if $(filter $@, $(targets)), \ |
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- due to missing .cmd file, \ |
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- due to $(notdir $@) not in $$(targets) \ |
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) \ |
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) \ |
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) \ |
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), \ |
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- due to target missing \ |
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) \ |
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) |
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echo-why = $(call escsq, $(strip $(why))) |
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endif |
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############################################################################### |
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# |
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# When a Kconfig string contains a filename, it is suitable for |
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# passing to shell commands. It is surrounded by double-quotes, and |
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# any double-quotes or backslashes within it are escaped by |
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# backslashes. |
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# |
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# This is no use for dependencies or $(wildcard). We need to strip the |
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# surrounding quotes and the escaping from quotes and backslashes, and |
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# we *do* need to escape any spaces in the string. So, for example: |
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# |
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# Usage: $(eval $(call config_filename,FOO)) |
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# |
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# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, |
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# transformed as described above to be suitable for use within the |
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# makefile. |
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# |
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# Also, if the filename is a relative filename and exists in the source |
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# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to |
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# be prefixed to *both* command invocation and dependencies. |
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# |
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# Note: We also print the filenames in the quiet_cmd_foo text, and |
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# perhaps ought to have a version specially escaped for that purpose. |
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# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good |
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# enough. It'll strip the quotes in the common case where there's no |
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# space and it's a simple filename, and it'll retain the quotes when |
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# there's a space. There are some esoteric cases in which it'll print |
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# the wrong thing, but we don't really care. The actual dependencies |
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# and commands *do* get it right, with various combinations of single |
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# and double quotes, backslashes and spaces in the filenames. |
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# |
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############################################################################### |
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# |
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define config_filename |
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ifneq ($$(CONFIG_$(1)),"") |
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$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) |
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ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) |
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else |
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ifeq ($$(wildcard $$($(1)_FILENAME)),) |
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ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) |
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$(1)_SRCPREFIX := $(srctree)/ |
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endif |
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endif |
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endif |
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endif |
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endef |
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# |
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############################################################################### |
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# delete partially updated (i.e. corrupted) files on error |
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.DELETE_ON_ERROR: |
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# do not delete intermediate files automatically |
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.SECONDARY:
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