[gentoo-user] Downgrading glibc

[gentoo-user] Downgrading glibc

[7v5w7go9ub0o]

I went through the gcc upgrade and discovered that ssp no longer works  
(suppose it was documented somewhere - but I missed it)

So I'm trying to reverse the upgrade process (this time using using a  
hardened profile) and glibc won't allow me to downgrade.

How do I get around this, please?

I've considered hacking the script/size/md5 tests, but would prefer to do  
it the proper way.

TIA
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gentoo-user@gentoo.org mailing list

[gentoo-user] downgrading glibc

[Raffaele Belardi]

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

Re: [gentoo-user] downgrading glibc

[Nils Freydank]

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Hi Raffaele,

Am Freitag, 18. August 2017, 09:00:52 CEST schrieb Raffaele Belardi:
> […]
> Downgrading the system to glibc to 2.23-r3 means trouble?
yes, you would crush your system. Therefore the even the ebuild prohibits it 
(you can enforce it, but you really shouldn’t).

You can a) brick you system: https://forums.gentoo.org/viewtopic-t-845000.html
or b) create a chroot with a blank system (new stage 3), emerge your package, 
create a binpkg, install that on the host and hope it works.

Good luck! :-)


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Nils Freydank

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Re: [gentoo-user] downgrading glibc

[Raffaele Belardi]

On Fri, 2017-08-18 at 16:25 +0200, Nils Freydank wrote:
> Hi Raffaele,
> 
> Am Freitag, 18. August 2017, 09:00:52 CEST schrieb Raffaele Belardi:
> > […]
> > Downgrading the system to glibc to 2.23-r3 means trouble?
> 
> yes, you would crush your system. Therefore the even the ebuild
> prohibits it 
> (you can enforce it, but you really shouldn’t).
> 
> You can a) brick you system: https://forums.gentoo.org/viewtopic-t-84
> 5000.html
> or b) create a chroot with a blank system (new stage 3), emerge your
> package, 
> create a binpkg, install that on the host and hope it works.
> 

Message loud and clear, better search for a different solution or wait
for a fix!

thanks,

raffaele