Re: [gentoo-user] Building media-libs/lcms-2.6-r1 failed

[Canek Peláez Valdés]

On Wed, Oct 29, 2014 at 1:10 PM, Gevisz <gevisz@×××××.com> wrote:
> On Wed, 29 Oct 2014 19:25:20 +0200 Alexander Kapshuk <alexander.kapshuk@×××××.com> wrote:
>
>> On Wed, Oct 29, 2014 at 6:05 PM, Gevisz <gevisz@×××××.com> wrote:
>> > After today's # emerge-webrsyc
>> > # emerge --update --deep --with-bdeps=y --newuse --backtrack=90 --ask world
>> > failed with the following message:
>> >
>> > These are the packages that would be merged, in order:
>> >
>> > Calculating dependencies... done!
>> > [ebuild     U  ] media-libs/lcms-2.6-r1 [2.5] USE="threads%*" ABI_X86="(64%*) (-32) (-x32)"
>> > [ebuild     U  ] net-misc/wget-1.16 [1.14]
>> > [ebuild     U  ] media-gfx/imagemagick-6.8.9.9 [6.8.8.10-r1]
>> >
> <skipped>
>> >
>> > I think that something may be wrong with sys-devel/gcc-4.8.3 as my problems begun when
>> > I have updated it from sys-devel/gcc-4.7.3-r1 this Monday. Namely, just after this only
>> > update, # emerge @preserved-rebuild
>> > failed to rebuild app-text/pdftk-1.44 that was not updated that time and built well with
>> > sys-devel/gcc-4.7.3-r1. Then I recalled that to build app-text/pdftk I had to add gcj use
>> > flag to sys-devel/gcc. So, as I am not fond of Java, I just unmerged app-text/pdftk.
>> > Bu now it seems that I had to unmerge media-libs/lcms and all packages that depend on it.
>> >
>> > May be it would be easier to unmerge sys-devel/gcc-4.8.3 and return back to
>> > sys-devel/gcc-4.7.3-r1 but I do not know how to do it properly.
>> >
>>
>> Did you remember to run 'gcc-config -f 1' after updating gcc as root?
>
> No, I did not remember to run 'gcc-config -f 1' because I never knew that it should be done
> and no portage message advised me to do so.  `man gcc' or `man gcc-config' also report that
> there is no manual on these packets. Gentoo's Upgrading GCC wiki also says nothing about
> this command...
>
>> What's the output of 'gcc-config -l'?
>
> # gcc-config -l
>  * gcc-config: Active gcc profile is invalid!
>
>  [1] x86_64-pc-linux-gnu-4.8.3
>
> Nice!
>
> Ok, trying # gcc-config -f 1
>  * Switching native-compiler to x86_64-pc-linux-gnu-4.8.3 ...
>>>> Regenerating /etc/ld.so.cache...                                                                                                                            [ ok ]
>
>  * If you intend to use the gcc from the new profile in an already
>  * running shell, please remember to do:
>
>  *   . /etc/profile
>
>
> What exactly shall I remember to do?
>
> Ok, # gcc-config -l
>  [1] x86_64-pc-linux-gnu-4.8.3 *
>
> Now # emerge --update --deep --with-bdeps=y --newuse --backtrack=90 --ask world
> emerges all three above packages.
>
> Trying to emerge pdftk. Done.
>
> Ok. Thank you. But why there was no hint about it after updating gcc?
>
> Well, there was a reference to Gentoo's Upgrading GCC wiki
> but nothing more...

From the toolchain eclass[1]:

# if we're installing a genuinely different compiler version,
# we should probably tell the user -how- to switch to the new
# gcc version, since we're not going to do it for him/her.
# We don't want to switch from say gcc-3.3 to gcc-3.4 right in
# the middle of an emerge operation (like an 'emerge -e world'
# which could install multiple gcc versions).
# Only warn if we're installing a pkg as we might be called from
# the pkg_{pre,post}rm steps.  #446830
if [[ ${EBUILD_PHASE} == *"inst" ]] ; then
        einfo "The current gcc config appears valid, so it will not be"
        einfo "automatically switched for you.  If you would like to"
        einfo "switch to the newly installed gcc version, do the"
        einfo "following:"
        echo
        einfo "gcc-config ${CTARGET}-${GCC_CONFIG_VER}"
        einfo "source /etc/profile"
        echo
fi

This gets printed if you "genuinely" install a different compiler
version. If it didn't, it is a bug and should be reported.

Regards.

[1] http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/eclass/toolchain.eclass?view=markup
-- 
Canek Peláez Valdés
Profesor de asignatura, Facultad de Ciencias
Universidad Nacional Autónoma de México