libQt5Core bloated

Creating AppImages
1

I use linuxdeployqt to create AppDir and noticed that it grows libQt5Core significantly.
Size of libQt5Core before linuxdeployqt is 4 MB, and after is 6,2 MB.

What does linuxdeployqt do to that library?

Additional info:

  1. OS is Ubuntu 16.04
  2. libQt5Core is stripped before linuxdeployqt
  3. Qt is 5.14.2
  4. size of other Qt libraries like e.g. libQt5Network is not affected by linuxdeployqt
2

linuxdeployqt uses patchelf to set search paths for libraries, maybe it is an issue with patchelf?

3

Maybe. I tried to patchelf libQt5Core myself before linuxdeployqt and it increases size but not that much.

I even build patchelf in the latest version myself to rule out any known issues.

There must be something that linuxdeployqt does to libQt5Core only.

4

Not that I am aware of.

This is interesting, can you please open a ticket in the linuxdeployqt project and show a way how to reproduce this. Thanks!

5

So you cannot reproduce/observe the same in one of your AppImages?

6

I’ve seen worse bugs in patchelf than increasing binary size… so I don’t see this as super critical, especially since AppImages use compression anyway. Feel free to look into it though.