[Interest] unnecessary files in qrc system in webassembly

[Adam]

Hi,

I'm using Qt 6.6.1 and cmake.

I have imports like this:

import QtQuick
import QtQuick.Controls.Material
import QtQuick.Layouts
import QtQuick.Dialogs

at one point i'm also importing QtQuick.Controls.Universal.

i also verified that at no point i'm importing QtQuick.Controls alone. 
i'm linking in CMakeLists.txt via:
target_link_libraries(alpineapp PUBLIC nucleus gl_engine Qt::Quick 
Qt::QuickControls2 Qt::Charts) // Charts removed on my other workstation 
with no change.

this is the CMakeLists.txt i'm using (along with the rest of the 
project: 
https://github.com/adam-ce/alpine_renderer/blob/main/app/CMakeLists.txt 
with automatic builds at 
https://adam-ce.github.io/alpine_renderer/wasm_singlethread/alpineapp.html

interestingly, on a desktop build, only commonstyle and macstyle are 
imported (no material style, but it's there in the app).

I also just tried the calqlatr example, replacing the only import of 
QtQuick.Controls i found with QtQuick.Controls.Material and adding my 
debug code for printing styles. The result is import of the imagine, 
basic and fusion style, but surprisingly not material.

I'll try to setup a minimal example on tomorrow.

Thanks, Adam

On 02/02/2024 18:29, Mike Trahearn wrote:
> Hi Adam,
>
> How are you using the styles in QML?
> Are you importing QtQuick.Controls (only) or are you using specific 
> style imports?
> Which version of Qt? CMake assumed?
>
> Assuming the latter and at least Qt 6.2, CMake will only build in the 
> libraries it absolutely needs. But for this to be the case, it needs 
> to know what it needs. Using just import QtQuick.Controls relies on 
> run-time style selection (for which there are different ways to 
> select, all nicely documented). In this case the compiler cannot know 
> in advance which to include, so it has to bring in all of them just in 
> case you run post-build with a different style however it selects it.
>
> For compile-time style selection, you import 
> QtQuick.Controls.Basic/Fusion/Universal .... being specific. Or.. you 
> can use your own style and not Qt Quick Controls at all (albeit it is 
> sometimes hard to not use some of its nice helper types). In this case 
> the compiler only compiles what it needs and there would be nothing in 
> CMake that generates a qrc file with all the run-time style options.
>
> Very obviously this is not your observation so more details on your Qt 
> Quick Controls usage and how you choose your styles and any relevant 
> CMake project/module info would be helpful for someone here to better 
> understand your specific case and more importantly, if there might be 
> a bug.
>
> Mike
>
> ------------------------------------------------------------------------
> *From:* Interest <interest-bounces at qt-project.org> on behalf of Adam 
> <qt_interest at xibo.at>
> *Sent:* Saturday, February 3, 2024 1:19:35 AM
> *To:* interest at qt-project.org <interest at qt-project.org>
> *Subject:* [Interest] unnecessary files in qrc system in webassembly
> Hi,
>
> I'm building a QML app for WebAssembly using CMake. When debugging
> something else, I printed all files that are in the qrc system. Doing
> that, I saw, that the macos, universal and fusion styles are all
> compiled in. There are also a bunch of icons for file dialogues etc. I'm
> not using them, and they increase the binary (wasm) size.
>
> Is there any way to remove them?
>
> Thanks, Adam
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