[Kernel-handbook-general] About changing the configuration before building

[Chen Baozi]

> On Dec 12, 2014, at 12:55, Ben Hutchings <ben at decadent.org.uk> wrote:
> 
> On Fri, 2014-12-12 at 11:24 +0800, Chen Baozi wrote:
>> Hi Ben,
>> 
>>> On Dec 12, 2014, at 11:16, Ben Hutchings <ben at decadent.org.uk> wrote:
>>> 
>>> On Fri, 2014-12-12 at 10:52 +0800, Chen Baozi wrote:
>>>> Hi all,
>>>> 
>>>> According to the handbook, to change the configuration before building, one
>>>> could do:
>>>> 
>>>> $ make -C debian/build/build_${ARCH}_${FEATURESET}_${FLAVOUR} menuconfig
>>>> 
>>>> And then build the packages using:
>>>> 
>>>> $ fakeroot make -f debian/rules.gen \
>>>> 	binary-arch_${ARCH}_${FEATURESET}_${FLAVOUR}
>>>> 
>>>> However, it seems that what the first command is the .config under the
>>>> debian/build/build_${ARCH}_${FEATURESET}_${FLAVOUR}, while the binary-arch
>>>> would use the config from ${BUILD_DIR}/config.${ARCH}_${FEATURESET}_${FLAVOUR}.
>>> [...]
>>> 
>>> The latter file is only generated and copied while the build directory
>>> is being set up (setup_$(ARCH)_$(FEATURESET)_$(FLAVOUR) targets).  Once
>>> that is done (indicated by the presence of a stamp file), invoking the
>>> corresponding build-arch and binary-arch targets will not cause it to be
>>> copied again.
>> 
>> Thanks. However, it looks like only if did I edit the latter file the
>> modified config can then be used in the binary-arch_* build. If I used
>> the ‘menuconfig’ way I mentioned and then invoked the binary-arch target,
>> the build didn’t use the .config I have just changed by ‘menuconfig’.
>> 
>> Anything that I might be wrong?
> 
> Please provide the full series of commands you tried.

$ fakeroot make -f debian/rules.gen setup_armhf_none_armmp-lpae
$ make -C debian/build/build_armhf_none_armhf_none_armmp-lpae menuconfig
$ fakeroot make -f debian/rules.gen \
	binary-arch_armhf_none_armmp-lpae

It seems like the ‘menuconfig’ won’t affect the later building? So I
tried to append the configs I expected to the debian/build/config.armhf_none_armmp-lpae,
it works but would rebuilt the binary from scratch which takes relatively
long time.

Cheers,

Baozi

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