GNU bug report logs - #36276
qtbase@5 doesn't work with Linux < 3.16.0

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From: Andréas Livet <andreas <at> livet.me>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 36276 <at> debbugs.gnu.org
Subject: bug#36276: Not found .so files in bundle made by guix pack
Date: Tue, 25 Jun 2019 10:38:41 +0200

Hello,

> Good!  So you ran:
>
>    strip --remove-section=.note.ABI-tag \
>       ./gnu/store/…/lib/libQt5Core.so.5
>
> right?
Yes exactly :).
>
> Indeed the .so file produced by Guix has this section:
>
> --8<---------------cut here---------------start------------->8---
> $ file -L /gnu/store/y1nlilwa34wqvmvmraggwv12jfdp0kya-qtbase-5.11.3/lib/libQt5Core.so
> /gnu/store/y1nlilwa34wqvmvmraggwv12jfdp0kya-qtbase-5.11.3/lib/libQt5Core.so: ELF 64-bit LSB pie executable x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ld-linux-x86-64.so.2, for GNU/Linux 3.16.0, stripped
> --8<---------------cut here---------------end--------------->8---
>
> … which reflects in the “for GNU/Linux 3.16.0” that we see above.
>
> What does “uname -r” return on this CentOS machine?  I’m guessing it’s
> older than 3.16.0.
> 3.10.0-957.12.2.el7.x86_64

What a shame, this kernel was release in 2013 !

I start to think that our VM was not installed properly because regular 
centos install seems to have a much more recent kernel...

> The effect of the ‘strip’ command is that libQt5Base.so can be loaded,
> but some functionality maybe missing (things that use the ‘renameat2’
> system call specifically; see below.)
>
>> Do you think it is related to guix pack in some way ?
> I researched it a bit and in qtbase, in
> ‘src/corelib/global/minimum-linux_p.h’, we can see this:
>
> --8<---------------cut here---------------start------------->8---
> #if QT_CONFIG(getentropy)
> #  define MINLINUX_MAJOR        3
> #  define MINLINUX_MINOR        17
> #  define MINLINUX_PATCH        0
> #elif QT_CONFIG(renameat2)
> #  define MINLINUX_MAJOR        3
> #  define MINLINUX_MINOR        16
> #  define MINLINUX_PATCH        0
> #else
> #  define MINLINUX_MAJOR        2
> #  define MINLINUX_MINOR        6
> #  define MINLINUX_PATCH        28
> #endif
> --8<---------------cut here---------------end--------------->8---

Well done :D, I didn't have time to investigated as far as you did.

> Since we build Qt with ‘renameat2’ support, Qt effectively requires a
> Linux kernel >= 3.16.0.
>
> We could build it without that requirement; 3.16.0 is already rather
> old, so I’m not sure we should do it.
>
> Thoughts?

IMHO, don't bother, as you say 3.16.0 is already very old so it's OK to 
let it this way.

Maybe it could be worth to mention in guix pack manual that bundle may 
not always works on too old kernel ?

Difficult to be precise because it'll depends on projects, don't really 
know how to write it down in a way it'll help people to understand 
problems like this one.

Thanks again for your hard work,

Andréas

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