[Interest] When does Qt load its plugins?

[Elvis Stansvik]

2016-07-13 20:36 GMT+02:00 Thiago Macieira <thiago.macieira at intel.com>:
> Em quarta-feira, 13 de julho de 2016, às 20:14:06 PDT, Elvis Stansvik
> escreveu:
>> Alright, I sort of suspected that was the case. But I realize now that
>> it's much better I read up on what each plugin does and determine if I
>> need it, instead of trying to deduce it from stracing.
>
> Another detail about strace: the plugins may be scanned for metadata very
> early on, much earlier than when they're actually loaded. And even those that
> are loaded may never be actually used, like some image formats.
>
> You can use QT_DEBUG_PLUGINS=1 to get some debugging output from QLibrary
> about whether it's scanning and which ones it actually loads. You can also use
> LD_DEBUG=libs (or "files") to get the Linux dynamic loader to tell you what it
> is really loading, and even why. Though the "why" is useless for plugins
> loaded via QLibrary, because they will all show up as "loaded by QtCore".
>
> You may be able to detect an open(2) call by QLibrary vs an open(2) call by
> ld-linux.so in your strace by the flags that each one uses or the calls done
> immediately after. Exercise left to the reader.

Ah, thanks for the info.

Elvis

>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
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