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[PATCH] kbuild: improve option checking, Kbuild.include cleanup
GNU binutils, root users, tmpfiles, external modules ro builds must be fixed to do the right thing now. Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Horst Schirmeier <horst@schirmeier.com> Cc: Jan Beulich <jbeulich@novell.com> Cc: Daniel Drake <dsd@gentoo.org> Cc: Andi Kleen <ak@suse.de> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Oleg Verych <olecom@flower.upol.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Verych
Linus Torvalds
parent
f6112ec27a
commit
5de043f4bd
1 changed files with 54 additions and 44 deletions
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@ -1,7 +1,7 @@
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####
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# kbuild: Generic definitions
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# Convinient variables
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# Convenient constants
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comma := ,
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squote := '
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empty :=
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@ -56,40 +56,46 @@ endef
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# gcc support functions
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# See documentation in Documentation/kbuild/makefiles.txt
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# output directory for tests below
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TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
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# checker-shell
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# Usage: option = $(call checker-shell, $(CC)...-o $$OUT, option-ok, otherwise)
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# Exit code chooses option. $$OUT is safe location for needless output.
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define checker-shell
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$(shell set -e; \
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DIR=$(KBUILD_EXTMOD); \
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cd $${DIR:-$(objtree)}; \
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OUT=$$PWD/.$$$$.null; \
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\
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ln -s /dev/null $$OUT; \
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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 $$OUT)
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endef
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# as-option
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# Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
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as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
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-xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
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else echo "$(2)"; fi ;)
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as-option = $(call checker-shell, \
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$(CC) $(CFLAGS) $(1) -c -xassembler /dev/null -o $$OUT, $(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 = $(shell if echo -e "$(1)" | \
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$(CC) $(AFLAGS) -c -xassembler - \
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-o $(TMPOUT)astest$$$$.out > /dev/null 2>&1; \
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then rm $(TMPOUT)astest$$$$.out; echo "$(2)"; \
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else echo "$(3)"; fi)
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as-instr = $(call checker-shell, \
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printf "$(1)" | $(CC) $(AFLAGS) -c -xassembler -o $$OUT -, $(2), $(3))
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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 = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
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> /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
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cc-option = $(call checker-shell, \
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$(CC) $(CFLAGS) $(if $(3),$(3),$(1)) -S -xc /dev/null -o $$OUT, $(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 = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
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> /dev/null 2>&1; then echo "y"; else echo "n"; fi;)
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cc-option-yn = $(call cc-option, "y", "n", $(1))
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# cc-option-align
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# Prefix align with either -falign or -malign
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cc-option-align = $(subst -functions=0,,\
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$(call cc-option,-falign-functions=0,-malign-functions=0))
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$(call cc-option,-falign-functions=0,-malign-functions=0))
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# cc-version
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# Usage gcc-ver := $(call cc-version, $(CC))
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@ -97,32 +103,39 @@ cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(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 if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
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echo $(3); fi;)
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cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
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# ld-option
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# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
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ld-option = $(shell if $(CC) $(1) -nostdlib -xc /dev/null \
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-o $(TMPOUT)ldtest$$$$.out > /dev/null 2>&1; \
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then rm $(TMPOUT)ldtest$$$$.out; echo "$(1)"; \
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else echo "$(2)"; fi)
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ld-option = $(call checker-shell, \
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$(CC) $(1) -nostdlib -xc /dev/null -o $$OUT, $(1), $(2))
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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 $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
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# Prefix -I with $(srctree) if it is not an absolute path
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addtree = $(if $(filter-out -I/%,$(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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# Prefix -I with $(srctree) if it is not an absolute path,
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# add original to the end
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addtree = $(if \
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$(filter-out -I/%, $(1)), $(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
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# If quiet is set, only print short version of command
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# Find all -I options and call addtree
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flags = $(foreach o,$($(1)), \
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$(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 is not absolute
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objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
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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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@ -133,16 +146,12 @@ objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
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# See Documentation/kbuild/makefiles.txt for more info
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ifneq ($(KBUILD_NOCMDDEP),1)
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# Check if both arguments has same arguments. Result in empty string if equal
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# Check if both arguments has same arguments. Result is empty string, if equal.
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# User may override this check using make KBUILD_NOCMDDEP=1
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arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
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$(filter-out $(cmd_$@), $(cmd_$(1))) )
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endif
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# echo command. Short version is $(quiet) equals quiet, otherwise full command
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echo-cmd = $(if $($(quiet)cmd_$(1)), \
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echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
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# >'< substitution is for echo to work,
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# >$< substitution to preserve $ when reloading .cmd file
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# note: when using inline perl scripts [perl -e '...$$t=1;...']
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@ -153,15 +162,15 @@ make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
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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 prerequisitei(s) are updated
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# Execute command if command has changed or prerequisite(s) are updated.
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#
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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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echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
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# execute the command and also postprocess generated .d dependencies
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# file
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# Execute the command and also postprocess generated .d dependencies file.
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#
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if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
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@set -e; \
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$(echo-cmd) $(cmd_$(1)); \
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@ -169,9 +178,10 @@ if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
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rm -f $(depfile); \
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mv -f $(dot-target).tmp $(dot-target).cmd)
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# Will check if $(cmd_foo) changed, or any of the prerequisites changed,
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# and if so will execute $(rule_foo).
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# Usage: $(call if_changed_rule,foo)
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# will check if $(cmd_foo) changed, or any of the prequisites changed,
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# and if so will execute $(rule_foo)
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#
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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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