Qt3D 6.0.2 on Windows using MinGW 8.1.0

[damselfish]

Hello all,

I am experiencing a strange problem when trying to compile Qt3D 6.0.2. I am using the MinGW 8.1.0 compiler conveniently supplied with Qt. I installed all depencies (Vulkan SDK, OpenSSL, and Perl). The compilation as such succeeded and I got all of the DLLs:

C:\Qt\6.0.2\mingw81_64\bin>dir Qt63D*.dll
 Volume in drive C is Windows
 Volume Serial Number is xxxx-xxxx

 Directory of C:\Qt\6.0.2\mingw81_64\bin

12.03.2021  10:17         1,370,252 Qt63DAnimation.dll
12.03.2021  09:43         1,261,206 Qt63DCore.dll
12.03.2021  10:11         1,544,460 Qt63DExtras.dll
12.03.2021  09:46         1,129,967 Qt63DInput.dll
12.03.2021  09:43           196,690 Qt63DLogic.dll
12.03.2021  10:18           610,793 Qt63DQuick.dll
12.03.2021  10:25           208,899 Qt63DQuickAnimation.dll
12.03.2021  10:23           377,370 Qt63DQuickExtras.dll
12.03.2021  10:24           183,885 Qt63DQuickInput.dll
12.03.2021  10:20           550,844 Qt63DQuickRender.dll
12.03.2021  10:22           251,139 Qt63DQuickScene2D.dll
12.03.2021  10:06         6,123,165 Qt63DRender.dll
              12 File(s)     13,808,670 bytes
               0 Dir(s)  533,357,686,784 bytes freeode_text

Compiling the basic shapes 3D example was also successful. Anyhow, trying to execute the program (from within QtCreator) yielded the following error message:

13:00:45: Starting C:\Qt\Examples\Qt-5.9.7\qt3d\basicshapes-cpp\release\basicshapes-cpp.exe ...
Unable to find renderer plugin for opengl
13:00:46: The program has unexpectedly finished.
13:00:46: The process was ended forcefully.
13:00:46: C:\Qt\Examples\Qt-5.9.7\qt3d\basicshapes-cpp\release\basicshapes-cpp.exe crashed.

Taking a look inside the respective plugins directory reveals that the plugins where not built correctly (only .a and .prl files, but no DLLs):

C:\Qt\6.0.2\mingw81_64\plugins\renderers>dir
 Volume in drive C is Windows
 Volume Serial Number is xxxx-xxxx

 Directory of C:\Qt\6.0.2\mingw81_64\plugins\renderers

12.03.2021  10:55    <DIR>          .
12.03.2021  10:55    <DIR>          ..
12.03.2021  10:49       127,890,310 libopenglrenderer.a
12.03.2021  10:52        82,535,202 librhirenderer.a
12.03.2021  10:43             1,020 openglrenderer.prl
12.03.2021  10:49             1,094 rhirenderer.prl
               4 File(s)    210,427,626 bytes
               2 Dir(s)  533,356,797,952 bytes free

Am I missing something here, or might I have just come across a bug?

Many thanks in advance!

[SGaist]

Hi and welcome to devnet,

There's something strange indeed.

It seems they have been built statically.

How did you build Qt3D ?

[damselfish]

Hi,

thanks for your reply. I built Qt3D according to the HowTo (https://wiki.qt.io/Qt6_Add-on_src_package_build_using_Conan_package_manager). More specifically I opened the appropriate Qt MinGW 8.1.0 command prompt and entered the following command line:

conan.exe install qt3d/6.0.2@qt/final --build=missing --profile=C:/Qt/Tools/Conan/profiles/qt-6.0.2-mingw81_64 -s build_type=Release -g cmake_paths -g=cmake -g deploy

I did not encounter any anomalies during the build process and it seemed to finish successfully. Might one of the dependencies cause such a strange behavior (e.g. OpenSSL)?

[SGaist]

No that looks fine. Using static dependencies does not automatically trigger a static library creation.

It's seems to be a bug indeed.