[Development] qt6_add_shaders and static libraries
Ranen Ghosh
ranen.ghosh at navblue.aero
Wed Sep 13 00:10:01 CEST 2023
Hi, I've found that there's a cpp file, and then an object file, generated
with the name qrc_<RESOURCE_NAME>. And the object file includes the symbol
qInitResources_<RESOURCE_NAME>
(See https://doc.qt.io/qt-6/qt-add-resources.html for where <RESOURCE_NAME>
comes from, as qt6_add_shaders calls qt6_add_resources)
So the only remaining issue is that just calling qt6_add_shaders in the
cmake and Q_INIT_RESOURCE(<RESOURCE_NAME>) in cpp results in
Undefined symbol: qInitResources_<RESOURCE_NAME>()
So there is still something remaining to do in the cmake that is not
handled by the call to qt6_add_shaders.
Ranen Ghosh
Software Developer | EFB | tel. +1519 747 1170
NAVBLUE <https://www.navblue.aero/> | 295 Hagey Blvd., Suite 200 | Waterloo
| AMER
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On Tue, Sep 12, 2023 at 6:39 AM Ranen Ghosh <ranen.ghosh at navblue.aero>
wrote:
> Hi,
>
>
> How does one use qt6_add_shaders in static libraries? When running an
> application that uses said static library, we get this error messages like
> this
>
>
> Failed to find shader "://shader.vert.qsb"
>
>
> We're using static linking because the target platform is iOS. On Windows
> where we use dynamic linking, we have no problem.
>
>
> We follow this practice for qrc resources which works fine
> "When embedding resources in static libraries,... explicitly register your
> resources by calling Q_INIT_RESOURCE() with the base name of the .qrc file."
>
>
> https://doc.qt.io/qt-6/resources.html#explicit-loading-and-unloading-of-embedded-resources
>
> How does this relate to shaders added with qt6_add_shaders? From the
> examples we have seen demonstrating qt6_add_resources, it does not seem to
> involve qrc. For example,
>
>
> https://github.com/qt/qtshadertools/blob/26ffa67b0212255e29ec751bc25ebef65973ee99/tests/auto/buildtimeqsb/CMakeLists.txt
>
> qt6_add_shaders(tst_buildtimeqsb "shaders"
> PREFIX
> "/test"
> FILES
> "color.vert"
> "color.frag"
> )
>
>
> https://github.com/qt/qtshadertools/blob/26ffa67b0212255e29ec751bc25ebef65973ee99/tests/auto/buildtimeqsb/tst_buildtimeqsb.cpp
>
> QShader color_vert = getShader(QLatin1String(":/test/color.vert.qsb"));
>
>
> (The URI does not have the qrc scheme)
>
>
> Thanks,
>
> Ranen
>
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