[GH-ISSUE #228] Linux armhf 32bit support #145

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opened 2026-05-05 11:06:44 -06:00 by gitea-mirror · 5 comments

gitea-mirror commented

2026-05-05 11:06:44 -06:00

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Originally created by @raven-worx on GitHub (Nov 9, 2020).
Original GitHub issue: https://github.com/qmlnet/qmlnet/issues/228

Hi,
we managed to compile libQmlNet.so for Linux armv7 (32bit). But during runtime we encounter the following runtime exception:

Unhandled exception. System.Exception: Unsupported target
at Qml.Net.Runtimes.RuntimeManager.RuntimeTargetToString(RuntimeTarget target)
at Qml.Net.Runtimes.RuntimeManager.FindQtRuntime(String[] runtimeDirectories, String qtVersion, RuntimeTarget target)
at Qml.Net.Runtimes.RuntimeManager.FindSuitableQtRuntime(RuntimeSearchLocation runtimeSearchLocation)
at Qml.Net.Runtimes.RuntimeManager.DiscoverOrDownloadSuitableQtRuntime(RuntimeSearchLocation runtimeSearchLocation)
at Features.Program.Main(String[] args) in /source/qmlnet-examples/src/Features/Program.cs:line 12

Digging into the source we spotted the explicit check for 64bit pointer width.
https://github.com/qmlnet/qmlnet/blob/develop/src/net/Qml.Net/Runtimes/RuntimeManager.cs#L47

What is the need for explicit 64bit?
And is there any chance to easily support 32bit?

Originally created by @raven-worx on GitHub (Nov 9, 2020). Original GitHub issue: https://github.com/qmlnet/qmlnet/issues/228 Hi, we managed to compile libQmlNet.so for Linux armv7 (32bit). But during runtime we encounter the following runtime exception: > Unhandled exception. System.Exception: Unsupported target at Qml.Net.Runtimes.RuntimeManager.RuntimeTargetToString(RuntimeTarget target) at Qml.Net.Runtimes.RuntimeManager.FindQtRuntime(String[] runtimeDirectories, String qtVersion, RuntimeTarget target) at Qml.Net.Runtimes.RuntimeManager.FindSuitableQtRuntime(RuntimeSearchLocation runtimeSearchLocation) at Qml.Net.Runtimes.RuntimeManager.DiscoverOrDownloadSuitableQtRuntime(RuntimeSearchLocation runtimeSearchLocation) at Features.Program.Main(String[] args) in /source/qmlnet-examples/src/Features/Program.cs:line 12 Digging into the source we spotted the explicit check for 64bit pointer width. https://github.com/qmlnet/qmlnet/blob/develop/src/net/Qml.Net/Runtimes/RuntimeManager.cs#L47 What is the need for explicit 64bit? And is there any chance to easily support 32bit?

gitea-mirror closed this issue

2026-05-05 11:06:45 -06:00

gitea-mirror commented

2026-05-05 11:06:46 -06:00

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@pauldotknopf commented on GitHub (Nov 9, 2020):

If you've manually compiled libQmlNet.so and it's installed into the proper location (/usr/lib, or LD_LIBRARY_PATH), then you shouldn't need to call the RuntimeManager.DiscoverOrDownloadSuitableQtRuntime anymore.

@pauldotknopf commented on GitHub (Nov 9, 2020): If you've manually compiled ```libQmlNet.so``` and it's installed into the proper location (```/usr/lib```, or ```LD_LIBRARY_PATH```), then you shouldn't need to call the ```RuntimeManager.DiscoverOrDownloadSuitableQtRuntime``` anymore.

gitea-mirror commented

2026-05-05 11:06:47 -06:00

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@pauldotknopf commented on GitHub (Nov 9, 2020):

Using RuntimeManager is only for using the pre-compiled Qt/lib bits that we manage.

@pauldotknopf commented on GitHub (Nov 9, 2020): Using ```RuntimeManager``` is only for using the pre-compiled Qt/lib bits that we manage.

gitea-mirror commented

2026-05-05 11:06:47 -06:00

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@raven-worx commented on GitHub (Nov 9, 2020):

i built libQmlNet.so by simply invoking build.sh and the result was linked against our custom Qt libs (verified by ldd).
Then i built qmlnet-examples and run it on the armv7 target device via dotnet Features.dll and the exception is raised.

@raven-worx commented on GitHub (Nov 9, 2020): i built libQmlNet.so by simply invoking `build.sh` and the result was linked against our custom Qt libs (verified by ldd). Then i built [qmlnet-examples](https://github.com/qmlnet/qmlnet-examples) and run it on the armv7 target device via `dotnet Features.dll` and the exception is raised.

gitea-mirror commented

2026-05-05 11:06:48 -06:00

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@pauldotknopf commented on GitHub (Nov 9, 2020):

Uncomment the usage of RuntimeManager in the examples project.

@pauldotknopf commented on GitHub (Nov 9, 2020): Uncomment the usage of ```RuntimeManager``` in the examples project.

gitea-mirror commented

2026-05-05 11:06:48 -06:00

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@raven-worx commented on GitHub (Nov 10, 2020):

ok, i uncommented the RuntimeManager line and it works now. thank you!

@raven-worx commented on GitHub (Nov 10, 2020): ok, i uncommented the RuntimeManager line and it works now. thank you!