[package] qt/5.15.2: Crash under 32-bits Windows machine when loading a jpeg using QPixmap::loadFromData (under 64-bits it works well)

[szigetics]

Package and Environment Details (include every applicable attribute)

• Package Name/Version: qt/5.15.2
• Operating System+version: Windows 10, 32-bits
• Compiler+version: MSVC 2019 (16)
• Conan version: conan 1.41.0
• Python version: Python 3.10.0

Conan profile (output of conan profile show default or conan profile show <profile> if custom profile is in use)

Configuration for profile default:

[settings]
os=Windows
os_build=Windows
arch=x86
arch_build=x86
compiler=Visual Studio
compiler.version=16
build_type=Release
[options]
[conf]
[build_requires]
[env]

Steps to reproduce (Include if Applicable)

Try to load a jpeg image under Windows, 32-bits, using this snippet (make sure that you have QApplication / QGuiApplication initialized, before this code) :

        std::string encodedImageData = "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	auto b64Decoded = QByteArray::fromBase64(encodedImageData.data());
	QPixmap pixmap;
	pixmap.loadFromData(b64Decoded);

More details about the crash :

There is a really similar bug report in the Qt bug tracking system : https://bugreports.qt.io/browse/QTBUG-75292 (Crash trying to load .jpg image via QImage) . The "resolution" of it was that the official Qt build is working fine. I suppose this also means that they think that the error is in the conan build (/ recipe).
I sent a bug report about this issue to Qt Tech Support as well. I will let you know if I get a response from them earlier than I get a response here.

Logs (Include/Attach if Applicable)

There is no relevant log entry in the Qt logs.

[ericLemanissier]

Can you reproduce the bug when using "official" 32bits qt build ?

[szigetics]

Can you reproduce the bug when using "official" 32bits qt build ?

No, I cannot reproduce this bug when using "official" 32bits qt build.
Everything is working fine with that build.

[szigetics]

@ericLemanissier :
In case if I build the recipe with
-o qt:with_libjpeg=libjpeg-turbo
than everything works fine.

I think that a solution of failing the build with an error message suggesting to use -o qt:with_libjpeg=libjpeg-turbo instead in case if :

1. the target OS is windows
2. the target arch is x86
3. and with_libjpeg==libjpeg

would be fine.

What do you think?

And also we could consider defaulting to -o qt:with_libjpeg=libjpeg-turbo since the official Qt package is using that as well.
The only thing : libjpeg-turbo conan recipe cannot be built for Windows arm64 without this : -e CONAN_CMAKE_SYSTEM_PROCESSOR=aarch64 .
For more info see :
conan-io/conan#8025
conan-io/conan#8026
#3392

Side note :
The official Qt package is using libjpeg-turbo as well :
https://doc.qt.io/qt-5/qtgui-index.html
=>
"LibJPEG-turbo, version 2.1.0"