mirror of
https://github.com/torvalds/linux.git
synced 2024-11-29 23:51:37 +00:00
9564a8cf42
I tried building using a freshly built Make (4.2.1-69-g8a731d1), but
already the objtool build broke with
orc_dump.c: In function ‘orc_dump’:
orc_dump.c:106:2: error: ‘elf_getshnum’ is deprecated [-Werror=deprecated-declarations]
if (elf_getshdrnum(elf, &nr_sections)) {
Turns out that with that new Make, the backslash was not removed, so cpp
didn't see a #include directive, grep found nothing, and
-DLIBELF_USE_DEPRECATED was wrongly put in CFLAGS.
Now, that new Make behaviour is documented in their NEWS file:
* WARNING: Backward-incompatibility!
Number signs (#) appearing inside a macro reference or function invocation
no longer introduce comments and should not be escaped with backslashes:
thus a call such as:
foo := $(shell echo '#')
is legal. Previously the number sign needed to be escaped, for example:
foo := $(shell echo '\#')
Now this latter will resolve to "\#". If you want to write makefiles
portable to both versions, assign the number sign to a variable:
C := \#
foo := $(shell echo '$C')
This was claimed to be fixed in 3.81, but wasn't, for some reason.
To detect this change search for 'nocomment' in the .FEATURES variable.
This also fixes up the two make-cmd instances to replace # with $(pound)
rather than with \#. There might very well be other places that need
similar fixup in preparation for whatever future Make release contains
the above change, but at least this builds an x86_64 defconfig with the
new make.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=197847
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
477 lines
18 KiB
Plaintext
477 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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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 -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 "$$TMP",$(1),$(2))
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# ld-option
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# Usage: LDFLAGS += $(call ld-option, -X)
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ld-option = $(call try-run-cached, $(LD) $(LDFLAGS) $(1) -v,$(1),$(2))
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# ar-option
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# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
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# Important: no spaces around options
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ar-option = $(call try-run-cached, $(AR) rc$(1) "$$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 >$$< to preserve $ when reloading the .cmd file
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# (needed for make)
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# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
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# (needed for make)
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# Replace >'< with >'\''< to be able to enclose the whole string in '...'
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# (needed for the shell)
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make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
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# Find any prerequisites that 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 -n 's/^.*=== __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
|
|
# differed from actual command line. This happens when compiler
|
|
# options changes
|
|
# (5) No dir/.target.cmd file (used to store command line)
|
|
# (6) No dir/.target.cmd file and target not listed in $(targets)
|
|
# This is a good hint that there is a bug in the kbuild file
|
|
ifeq ($(KBUILD_VERBOSE),2)
|
|
why = \
|
|
$(if $(filter $@, $(PHONY)),- due to target is PHONY, \
|
|
$(if $(wildcard $@), \
|
|
$(if $(strip $(any-prereq)),- due to: $(any-prereq), \
|
|
$(if $(arg-check), \
|
|
$(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
|
|
#
|
|
###############################################################################
|