[Interest] unnecessary files in qrc system in webassembly

[Adam]

Hi,

so I tracked it down to the import of QtQuick.Dialogs. When I import it, 
the size of the wasm file increases from iirc 34mb to 40, and my debug 
output shows the fusion and imagine style (plus some others). It makes 
sense as there are a bunch of native dialogs in there. though i don't 
know whether they are usable via wasm. In case somebody is finds this, 
do a full rebuild after removing dialogs. Seems like caching is at work 
there.

I don't know whether this is a bug or not. These styles don't show in 
native compilation on linux. and it's certainly surprising, that adding 
a colour dialogue adds 6mb on your wasm file.

should i report it as a bug?

thanks for the answer, it helped understanding the issue :)

cheers, Adam

On 04/02/2024 17:35, Adam wrote:
>
> 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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