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Thread: Update GCC 4.8 to 4.9?

  1. #1

    Default Update GCC 4.8 to 4.9?

    I installed openSUSE 13.2 and was surprised to find that it ships with a more dated c++ toolchain (not sure if its an issue with the compiler, or the standard library) than distributions that I was using previously (so certain features I relied on, and have been using for awhile, are missing).

    Trying to find a solution, I noticed that the repo's also contain gcc 4.9, however when I try to install it, it wants to uninstall quite a few other packages. I let it the first time, and halfway through, the whole OS crashed, and would not boot again. This was a clean install of 13.2, fully updated, and rebooted for good measure.

    So I thought, I would try Tumbleweed, in hopes that its default toolchain had been updated already, or at least a solution to the dependency issues I had while installing 4.9 on 13.2. Unfortunately it wants to remove the same packages. Rather than cross my fingers and hope it doesnt blow up again, I thought I would ask if anyone knows how to correctly update the toolchain.

  2. #2
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    Default Re: Update GCC 4.8 to 4.9?

    I can't answer your question wrt how to update from GCC 4.8 to 4.9. Supposedly this was to be a feature of openSUSE-13.2 ( https://en.opensuse.org/Portal:13.2 ) , but I don't know of a guide that explains how. I do recall 'many' years back when I once attempted a GCC update (around year 2003 or 2004) I encountered behaviour similar to what you encountered. Once bitten is twice shy, and I never tried such again. So my view even today is that a GCC update is not trivial.

    wrt why v.4.8 (and not v.4.9) when openSUSE-13.2 was going through most of its development and testing, my understanding is there were concerns wrt the stability of 4.9 (note this was > 14 months ago). Hence the decision was taken thenn to go for known stability, and provide 4.9 only as an option.

    Having typed the above, I also note the plan for the next version after 13.2 is to go to GCC-5.0, although there are still some problems there, as noted here in this openSUSE news from less than a week ago: https://news.opensuse.org/2015/03/05...pshot-systemd/

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    Default Re: Update GCC 4.8 to 4.9?

    How about:
    Code:
    zypper ar -f http://download.opensuse.org/repositories/devel:/gcc/openSUSE_13.2/devel:gcc.repo
    zypper dup --from devel_gcc
    This, naturally, at your own risk - as changing something as radical as gcc can have unforeseen consequences.

    Edit:
    And it's a development repo so that's double trouble. Be warned.
    .: miuku #suse @ irc.freenode.net
    :: miuku@opensuse.org

    .: h​ttps://download.opensuse.org/repositories/home:/Miuku/

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    Default Re: Update GCC 4.8 to 4.9?

    Quote Originally Posted by thedevilsjester View Post
    I installed openSUSE 13.2 and was surprised to find that it ships with a more dated c++ toolchain (not sure if its an issue with the compiler, or the standard library) than distributions that I was using previously (so certain features I relied on, and have been using for awhile, are missing).
    From a message in the factory mailing list:

    A bit further down the horizon are topics like GCC5 (still a lot of work happening, to ensure the full distribution builds) and ...

    They are working on gcc5. They won't release it until the whole distribution can be built with gcc5. I guess they are skipping 4.9.
    openSUSE Leap 15.1; KDE Plasma 5;
    testing Leap 15.2Alpha

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    Default Re: Update GCC 4.8 to 4.9?

    Quote Originally Posted by nrickert View Post
    That is a very salient mailing list thread . In particular note this message about the difficulty wrt 4.9 : http://lists.opensuse.org/opensuse-f.../msg00124.html

    .

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    Default Re: Update GCC 4.8 to 4.9?

    There are more updates on the GCC 5.0 status here: http://lists.opensuse.org/opensuse-p.../msg00034.html




    The project to get packages to build with GCC 5 which we should try to transition to has progressed but is not yet finished.

    https://build.opensuse.org/project/s...:Staging:Gcc49

    currently shows 13 package build fails and 59 packages not built due to failed requirements.

    Of the packages that fail building some of them have patches from me either in SR state or just in the devel projects which have not been pushed to Factory.

    Currently unfixed packages include (at least)

    coreutils
    mariadb
    pinentry
    post-build-checks
    python3-base
    reiserfs
    shim
    yast2-core
    libzypp
    memtest86+
    xen

    both libzypp and yast2-core are responsible for nearly all 59 packages in unresolved state (there is xen that also causes some unresolvables)

    I especially ask maintainers of packages that have got a fix from me for their package but didn't yet push that fix to Factory to do that.

    And I am asking the yast/zypp people to look at their packages.

    As openSUSE:Factory:Staging:Gcc49 only builds the set of packages to build the Minimal+X media the whole list of packages failing with GCC 5 will be larger - you are encouraged to add a repository building against openSUSE:Factory:Staging:Gcc49 to your devel project if it covers sth that can be built against Minimal+X (KDE & GNOME stack?)

    Thanks,
    Richard.

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