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9a234a2e38
Currently, the existence of $(dir $(make-cache)) is always checked,
and created if it is missing.
We can avoid unnecessary system calls by some tricks.
[1] If KBUILD_SRC is unset, we are building in the source tree.
The output directory checks can be entirely skipped.
[2] If at least one cache data is found, it means the cache file
was included. Obviously its directory exists. Skip "mkdir -p".
[3] If Makefile does not contain any call of __run-and-store, it will
not create a cache file. No need to create its directory.
[4] The "mkdir -p" should be only invoked by the first call of
__run-and-store
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
478 lines
18 KiB
Plaintext
478 lines
18 KiB
Plaintext
####
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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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right_paren := )
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left_paren := (
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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 -MD 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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# filename of first prerequisite with directory and extension stripped
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baseprereq = $(basename $(notdir $<))
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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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# 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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# define filechk_sample
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# echo $KERNELRELEASE
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# endef
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# version.h : Makefile
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# $(call filechk,sample)
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# The rule defined shall write to stdout the content of the new file.
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# The existing file will be compared with the new one.
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# - If no file exist it is created
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# - If the content differ the new file is used
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# - If they are equal no change, and no timestamp update
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# - stdin is piped in from the first prerequisite ($<) so one has
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# to specify a valid file as first prerequisite (often the kbuild file)
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define filechk
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$(Q)set -e; \
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$(kecho) ' CHK $@'; \
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mkdir -p $(dir $@); \
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$(filechk_$(1)) < $< > $@.tmp; \
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if [ -r $@ ] && cmp -s $@ $@.tmp; then \
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rm -f $@.tmp; \
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else \
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$(kecho) ' UPD $@'; \
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mv -f $@.tmp $@; \
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fi
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endef
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######
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# gcc support functions
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# See documentation in Documentation/kbuild/makefiles.txt
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# cc-cross-prefix
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# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
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# Return first prefix where a prefix$(CC) is found in PATH.
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# If no $(CC) found in PATH with listed prefixes return nothing
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cc-cross-prefix = \
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$(word 1, $(foreach c,$(1), \
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$(shell set -e; \
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if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
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echo $(c); \
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fi)))
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# Tools for caching Makefile variables that are "expensive" to compute.
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#
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# Here we want to help deal with variables that take a long time to compute
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# by making it easy to store these variables in a cache.
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#
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# The canonical example here is testing for compiler flags. On a simple system
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# each call to the compiler takes 10 ms, but on a system with a compiler that's
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# called through various wrappers it can take upwards of 100 ms. If we have
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# 100 calls to the compiler this can take 1 second (on a simple system) or 10
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# seconds (on a complicated system).
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#
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# The "cache" will be in Makefile syntax and can be directly included.
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# Any time we try to reference a variable that's not in the cache we'll
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# calculate it and store it in the cache for next time.
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# Include values from last time
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make-cache := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/,$(if $(obj),$(obj)/)).cache.mk
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$(make-cache): ;
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-include $(make-cache)
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cached-data := $(filter __cached_%, $(.VARIABLES))
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# If cache exceeds 1000 lines, shrink it down to 500.
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ifneq ($(word 1000,$(cached-data)),)
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$(shell tail -n 500 $(make-cache) > $(make-cache).tmp; \
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mv $(make-cache).tmp $(make-cache))
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endif
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create-cache-dir := $(if $(KBUILD_SRC),$(if $(cache-data),,1))
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# Usage: $(call __sanitize-opt,Hello=Hola$(comma)Goodbye Adios)
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#
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# Convert all '$', ')', '(', '\', '=', ' ', ',', ':' to '_'
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__sanitize-opt = $(subst $$,_,$(subst $(right_paren),_,$(subst $(left_paren),_,$(subst \,_,$(subst =,_,$(subst $(space),_,$(subst $(comma),_,$(subst :,_,$(1)))))))))
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# Usage: $(call shell-cached,shell_command)
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# Example: $(call shell-cached,md5sum /usr/bin/gcc)
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#
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# If we've already seen a call to this exact shell command (even in a
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# previous invocation of make!) we'll return the value. If not, we'll
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# compute it and store the result for future runs.
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#
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# This is a bit of voodoo, but basic explanation is that if the variable
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# was undefined then we'll evaluate the shell command and store the result
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# into the variable. We'll then store that value in the cache and finally
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# output the value.
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#
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# NOTE: The $$(2) here isn't actually a parameter to __run-and-store. We
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# happen to know that the caller will have their shell command in $(2) so the
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# result of "call"ing this will produce a reference to that $(2). The reason
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# for this strangeness is to avoid an extra level of eval (and escaping) of
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# $(2).
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define __run-and-store
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ifeq ($(origin $(1)),undefined)
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$$(eval $(1) := $$(shell $$(2)))
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ifeq ($(create-cache-dir),1)
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$$(shell mkdir -p $(dir $(make-cache)))
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$$(eval create-cache-dir :=)
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endif
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$$(shell echo '$(1) := $$($(1))' >> $(make-cache))
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endif
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endef
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__shell-cached = $(eval $(call __run-and-store,$(1)))$($(1))
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shell-cached = $(call __shell-cached,__cached_$(call __sanitize-opt,$(1)),$(1))
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# output directory for tests below
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TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
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# try-run
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# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
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# Exit code chooses option. "$$TMP" serves as a temporary file and is
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# automatically cleaned up.
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__try-run = set -e; \
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TMP="$(TMPOUT).$$$$.tmp"; \
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TMPO="$(TMPOUT).$$$$.o"; \
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if ($(1)) >/dev/null 2>&1; \
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then echo "$(2)"; \
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else echo "$(3)"; \
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fi; \
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rm -f "$$TMP" "$$TMPO"
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try-run = $(shell $(__try-run))
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# try-run-cached
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# This works like try-run, but the result is cached.
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try-run-cached = $(call shell-cached,$(__try-run))
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# as-option
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# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
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as-option = $(call try-run-cached,\
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$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
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# as-instr
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# Usage: cflags-y += $(call as-instr,instr,option1,option2)
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as-instr = $(call try-run-cached,\
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printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
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# __cc-option
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# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
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__cc-option = $(call try-run-cached,\
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$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
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# Do not attempt to build with gcc plugins during cc-option tests.
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# (And this uses delayed resolution so the flags will be up to date.)
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CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
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# cc-option
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# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
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cc-option = $(call __cc-option, $(CC),\
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$(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
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# hostcc-option
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# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
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hostcc-option = $(call __cc-option, $(HOSTCC),\
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$(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
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# cc-option-yn
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# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
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cc-option-yn = $(call try-run-cached,\
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
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# cc-disable-warning
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# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
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cc-disable-warning = $(call try-run-cached,\
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
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# cc-name
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# Expands to either gcc or clang
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cc-name = $(call shell-cached,$(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
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# cc-version
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cc-version = $(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
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# cc-fullversion
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cc-fullversion = $(call shell-cached,$(CONFIG_SHELL) \
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$(srctree)/scripts/gcc-version.sh -p $(CC))
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# cc-ifversion
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# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
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cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
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# cc-if-fullversion
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# Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
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cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
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# cc-ldoption
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# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
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cc-ldoption = $(call try-run-cached,\
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$(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
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# ld-option
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# Usage: LDFLAGS += $(call ld-option, -X)
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ld-option = $(call try-run-cached,\
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$(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
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$(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
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# ar-option
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# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
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# Important: no spaces around options
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ar-option = $(call try-run-cached, $(AR) rc$(1) "$$TMP",$(1),$(2))
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# ld-version
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# Note this is mainly for HJ Lu's 3 number binutil versions
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ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version.sh)
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# ld-ifversion
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# Usage: $(call ld-ifversion, -ge, 22252, y)
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ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
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######
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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.modbuiltin obj=
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# Usage:
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# $(Q)$(MAKE) $(modbuiltin)=dir
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modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin 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 $(if $(KBUILD_SRC),$(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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###
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# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
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# Usage:
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# $(Q)$(MAKE) $(hdr-inst)=dir
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hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
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# Prefix -I with $(srctree) if it is not an absolute path.
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# skip if -I has no parameter
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addtree = $(if $(patsubst -I%,%,$(1)), \
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$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
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# Find all -I options and call addtree
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flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
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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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# printing commands
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cmd = @$(echo-cmd) $(cmd_$(1))
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# Add $(obj)/ for paths that are not absolute
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objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
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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.txt for more info
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ifneq ($(KBUILD_NOCMDDEP),1)
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# Check if both arguments 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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arg-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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arg-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 >\#< 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 \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
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# Find any prerequisites that is newer than target or that does not exist.
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# PHONY targets skipped in both cases.
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any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
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# Execute command if command has changed or prerequisite(s) are updated.
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if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
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@set -e; \
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$(echo-cmd) $(cmd_$(1)); \
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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 $(strip $(any-prereq) $(arg-check) ), \
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@set -e; \
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$(cmd_and_fixdep), @:)
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ifndef CONFIG_TRIM_UNUSED_KSYMS
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cmd_and_fixdep = \
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$(echo-cmd) $(cmd_$(1)); \
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scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
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rm -f $(depfile); \
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mv -f $(dot-target).tmp $(dot-target).cmd;
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else
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# Filter out exported kernel symbol names from the preprocessor output.
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# See also __KSYM_DEPS__ in include/linux/export.h.
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# We disable the depfile generation here, so as not to overwrite the existing
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# depfile while fixdep is parsing it.
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flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
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ksym_dep_filter = \
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case "$(1)" in \
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cc_*_c|cpp_i_c) \
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$(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
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as_*_S|cpp_s_S) \
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$(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
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boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
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*) echo "Don't know how to preprocess $(1)" >&2; false ;; \
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esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
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cmd_and_fixdep = \
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$(echo-cmd) $(cmd_$(1)); \
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$(ksym_dep_filter) | \
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scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
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> $(dot-target).tmp; \
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rm -f $(depfile); \
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mv -f $(dot-target).tmp $(dot-target).cmd;
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endif
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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 $(strip $(any-prereq) $(arg-check) ), \
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@set -e; \
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$(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 $(strip $(any-prereq)),- due to: $(any-prereq), \
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$(if $(arg-check), \
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$(if $(cmd_$@),- due to command line change, \
|
|
$(if $(filter $@, $(targets)), \
|
|
- due to missing .cmd file, \
|
|
- due to $(notdir $@) not in $$(targets) \
|
|
) \
|
|
) \
|
|
) \
|
|
), \
|
|
- due to target missing \
|
|
) \
|
|
)
|
|
|
|
echo-why = $(call escsq, $(strip $(why)))
|
|
endif
|
|
|
|
###############################################################################
|
|
#
|
|
# When a Kconfig string contains a filename, it is suitable for
|
|
# passing to shell commands. It is surrounded by double-quotes, and
|
|
# any double-quotes or backslashes within it are escaped by
|
|
# backslashes.
|
|
#
|
|
# This is no use for dependencies or $(wildcard). We need to strip the
|
|
# surrounding quotes and the escaping from quotes and backslashes, and
|
|
# we *do* need to escape any spaces in the string. So, for example:
|
|
#
|
|
# Usage: $(eval $(call config_filename,FOO))
|
|
#
|
|
# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
|
|
# transformed as described above to be suitable for use within the
|
|
# makefile.
|
|
#
|
|
# Also, if the filename is a relative filename and exists in the source
|
|
# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
|
|
# be prefixed to *both* command invocation and dependencies.
|
|
#
|
|
# Note: We also print the filenames in the quiet_cmd_foo text, and
|
|
# perhaps ought to have a version specially escaped for that purpose.
|
|
# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
|
|
# enough. It'll strip the quotes in the common case where there's no
|
|
# space and it's a simple filename, and it'll retain the quotes when
|
|
# there's a space. There are some esoteric cases in which it'll print
|
|
# the wrong thing, but we don't really care. The actual dependencies
|
|
# and commands *do* get it right, with various combinations of single
|
|
# and double quotes, backslashes and spaces in the filenames.
|
|
#
|
|
###############################################################################
|
|
#
|
|
define config_filename
|
|
ifneq ($$(CONFIG_$(1)),"")
|
|
$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
|
|
ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
|
|
else
|
|
ifeq ($$(wildcard $$($(1)_FILENAME)),)
|
|
ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
|
|
$(1)_SRCPREFIX := $(srctree)/
|
|
endif
|
|
endif
|
|
endif
|
|
endif
|
|
endef
|
|
#
|
|
###############################################################################
|