Re: [gentoo-user] Gentoo chroot with old glibc

[Hervé Guillemet]

Le 21/06/2020 à 23:08, Rich Freeman a écrit :
> On Fri, Jun 19, 2020 at 5:19 PM Hervé Guillemet <hg@×××××××.fr> wrote:
>>
>> Or do you have any suggestion for alternatives to this gentoo chroot ?
>> (I'd prefer avoid installing some CentOS or Ubuntu as virtual guests).
>
> You're of course free to do it any way you wish, but if I wanted to
> create packages for various distros, I'd probably just follow their
> instructions for doing so.
>
> If you're making Ubuntu 16.04 packages I suspect it would be just a
> lot less fuss all around to do it from an Ubuntu 16.04 container, and
> so on.
>
> And if you're just building binaries and creating tarballs with them,
> well, why?  If people want to manually deal with stuff the source is
> already fine.  If they want the benefits of a package manager they're
> going to want packages.  And if you're hoping to encourage distros to
> do the packaging for you, they're probably only going to do that from
> source anyway.

In my case the application is a Java software embedding some native 
components. I don't want to limit the target system to some specific 
distros and specific versions, I just want the software to run on a 
large variety of linux boxes. All I have to do is to avoid linking with 
too recent libc and libstdc++.
Version 2.29+ of libc is particularly annoying because they introduce 
new version of pow(), log() and exp()... so any simple mathematical 
library compiled with 2.29+ won't run on linux distro using 2.28-.
As for the packaging, I'm using a jlink image in a tarball, and will 
probably use jpackage soon.

>
> I imagine most distros have a fairly straightforward packaging system,
> and I suspect a lot of CI systems have plugins to churn out packages
> for them automatically.  So why maintain some Gentoo chroot and
> carefully curate every single library on them to match some entirely
> different distro?  You're going to run into stuff where Gentoo doesn't
> have the version you need in the repo, and you'll be fighting auto
> updates, and so on.
>
> But, sure, you can get Gentoo to install whatever you want as long as
> you don't mind manually picking packages, or maintaining your own repo
> where you carefully curate this stuff.
>

Thanks for the suggestion. I believe my local build system with the 
chroot is enough for my current needs but I'll probably have to use a CI 
system if it becomes untractable or decide to use target distro 
packaging system.

-- 
Hervé