scripts/Kbuild.include:
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
# Usage:
# $(Q)$(MAKE) $(build)=dir
build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
851PHONY += $(vmlinux-dirs)
852$(vmlinux-dirs): prepare scripts
853 $(Q)$(MAKE) $(build)=$@
============================================================
'coz build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
then $(vmlinux-dir):
make -f $(if
$(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(vmlinux-dir)
vmlinux-dir see below:
================================================================
root Makefile:
621ifeq ($(KBUILD_EXTMOD),)
622core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
623
624vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
625 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
626 $(net-y) $(net-m) $(libs-y) $(libs-m)))
627
628vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
629 $(init-n) $(init-) \
630 $(core-n) $(core-) $(drivers-n) $(drivers-) \
631 $(net-n) $(net-) $(libs-n) $(libs-))))
632
633init-y := $(patsubst %/, %/built-in.o, $(init-y))
634core-y := $(patsubst %/, %/built-in.o, $(core-y))
635drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
636net-y := $(patsubst %/, %/built-in.o, $(net-y))
637libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
638libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
639libs-y := $(libs-y1) $(libs-y2)
640
2009/3/2 Pei Lin <[email protected]>:
> See the scripts/Makefile.build.
> first line is src := $(obj)
> So src = arch/mips/kernel
> # The filename Kbuild has precedence over Makefile
> kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
> kbuild-file := $(if $(wildcard
> $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
> include $(kbuild-file.
> ...
> # Built-in and composite module parts
> $(obj)/%.o: $(src)/%.c FORCE
> $(call cmd,force_checksrc)
> $(call if_changed_rule,cc_o_c)
>
>
> AFAIK,i think the details in the scripts/Makefile.build and it is the
> common makefile.
>
> 2009/2/28 Peter Teoh <[email protected]>:
>> i think u are asking how does Makefile works. I only understand some
>> aspect of it...not its entirety....which can be very powerful and
>> complex....suficient to generate my modules and integrate with the
>> rest of kernel.
>>
>> http://www-subatech.in2p3.fr/~photons/subatech/soft/srt/html/c2470.html
>> http://www.cs.duke.edu/~ola/courses/programming/Makefiles/node1.html
>> http://sunsite.ualberta.ca/Documentation/Gnu/make-3.79/html_chapter/make_3.html
>>
>> for all practical purposes, it is better to just take an existing
>> sample, and work from there....which means u have to spent some time
>> finding a good sample on the Internet......instead of spending time
>> learning all the details and write one of your own....my 2cts....
>>
>> On Fri, Feb 27, 2009 at 2:42 AM, MEHMET ALI EKICI
>> <[email protected]> wrote:
>>> Hi Peter,
>>> I also wonder much how build system works. I read the kbuild
>>> documentation but it is not clear to me.
>>> Would you please give us some guidence about algotihmic work of build
>>> system?
>>> Makefile includes xxx file, the xxx file defines such parameters it
>>> then includes yyyy file etc.
>>> I hope it would not be too boring to you ?
>>>
>>> Thanks,
>>
>> --
>> Regards,
>> Peter Teoh
>>
>> --
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>>
>>
>
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