Hi.
2018-07-12 14:13 GMT+09:00 Paul Smith <psm...@gnu.org>:
> On Thu, 2018-07-12 at 13:55 +0900, Masahiro Yamada wrote:
>> Please add V=1 to the build command, like this:
>>
>> $ make -j8 V=1 defconfig all
>>
>> It will emit _almost_ raw log.
>
> At this time I don't have the resources to do this. It will take me
> some time if you're going to wait for me.
No problem. No rush here.
The Linux build system is pretty complex.
I attached information that might be helpful.
Please take it FWIW.
>> > That's what we need to see; the actual command that
>> > was used to recursively invoke make.
>>
>> Linux Makefile hides "Entering directory ..." messages.
>>
>> If you want to see them,
>> please comment out the following line of the top Makefile.
>>
>> MAKEFLAGS += --no-print-directory
>
> I'm not that interested in seeing these but it wouldn't hurt. Mainly I
> need to see the manner in which the recursive make is invoked and the
> recipes used to do so.
OK, then V=1 is good enough
to show what you want.
How Linux Makefile works?
--------------------------
Linux needs the configuration before building any objects.
"make defconfig" configures the build setting
suitable for general usage.
"make all" actually builds the kernel.
"make defconfig all" is a useful shorthand
to do the two in a row.
[1] User run "make -j8 defconfig all"
[2] The configuration must finish before the Makefile
starts building any objects.
The following code divide "make defconfig all"
into two sub-makes "make defconfig" and "make all"
These two are run one by one.
__build_one_by_one:
$(Q)set -e; \
for i in $(MAKECMDGOALS); do \
$(MAKE) -f $(srctree)/Makefile $$i; \
done
[3] Sub-make "make defconfig" will find a recipe here
%config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@
[4] Sub-make "make all" starts, but top Makefile
needs to load include/config/auto.conf.
ifeq ($(dot-config),1)
-include include/config/auto.conf
endif
[5] A recipe to generate include/config/auto.conf
is found here.
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
[6] include/config/auto.conf has been generated,
so "make all" restarts.
I think the latest GNU Make emits
'jobserver unavailable: using -j1. Add '+' to parent make rule'
just before "make all" restarts.
[7] '-j8 --jobserver-auth' disappears from MAKEFLAGS,
then rest of the build process is serialized.
--
Best Regards
Masahiro Yamada
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