Re: [gentoo-user] Re: downgrading glibc

[Dale]

It may have been you but I was thinking either Walter or Duncan but not
sure.  It could be, I read it on -dev too.  I'm just not sure who it was
just know it is gentoo related, since Gentoo is all I'm subscribed to. 

One would think there would be some method to downgrade that is known to
work and documented.  It can be done for lots of other very important
packages but this one, not so much.  To me, it's just odd. 

At least the OP found a fix tho.  < whew >

Dale

:-)  :-) 

P. S. Top posting since Neil seems to be on some device that started
it.  :-D 


Neil Bothwick wrote:
> I did it once, some years ago. AFAIR I commented out the version che k
> in, i think, the glibc-toolchain eclass then emerged the older
> version. Just make sire you have a binary package of the current
> version that you can unpack in / if things go wrong.
>
> On 22 August 2017 13:53:35 EEST, Dale <rdalek1967@×××××.com> wrote:
>
>     Raffaele Belardi wrote:
>
>         On Fri, 2017-08-18 at 09:00 +0200, Raffaele Belardi wrote:
>
>             I hava a build problem upgrading Mythtv to 0.28.1-r1 [1]
>             on an ~amd64 system. The problem is related to a glibc API
>             change [2] introduced in glibc-2.24 and still present in
>             glibc-2.25. So I'm thinking to try the build with an older
>             glibc version. Downgrading the system to glibc to 2.23-r3
>             means trouble? If not, an emerge @preserved-rebuild after
>             the downgrade will be sufficient to not break the rest of
>             the system? I suppose a quickpkg of the whole world before
>             the downgrade would be a good idea, just in case...
>             thanks, raffaele [1]
>             https://bugs.gentoo.org/show_bug.cgi?id=604430 [2]
>             https://bugs.gentoo.org/show_bug.cgi?id=575232
>
>         Just as follow up, inspired by [2] I fixed the mythtv build
>         issue by adding #include <sys/sysmacros.h> to videosource.cpp
>         and continuing the build with ebuild instead of emerge. raffaele
>
>
>
>
>     Just a FYI, some have been able to downgrade and it work.  However, you
>     have to be prepared for that beforehand I think.  I've seen it posted
>     before but can't recall WHO it was.  I was hoping they would reply but
>     either they didn't see your post or they are no longer subscribed.
>
>     While it may be possible, it is risky and not recommended.  It's one
>     thing that I wish they had a known path to downgrade for.  It's one of
>     those, you don't know it's going to break something until it does and
>     you have little or no options.
>
>     Glad you got a workaround tho. Maybe some more info will pop up later.
>
>     Dale
>
>     :-)  :-)
>
>
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.