QT 14.2 cmake: Cannot find Qt5Widgets et. al.
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@sierdzio: thanks for input. This is a cross-compilation for android, so the cmake files goes into the local sysroot. I'm on Fedora, and certainly don't want to install these cmake files into the normal system-wide host locations.
That said, this might be a diversion. The core issue as I understand it is that when doing
find_package(Qt5Widgets REQUIRED)cmake looks for Qt5WidgetsConfig.cmake or FindQt5Widgets.cmake, and these files are just not installed anywhere by make install. -
@sierdzio: thanks for input. This is a cross-compilation for android, so the cmake files goes into the local sysroot. I'm on Fedora, and certainly don't want to install these cmake files into the normal system-wide host locations.
That said, this might be a diversion. The core issue as I understand it is that when doing
find_package(Qt5Widgets REQUIRED)cmake looks for Qt5WidgetsConfig.cmake or FindQt5Widgets.cmake, and these files are just not installed anywhere by make install.hm... At a closer look, seems to be about configuration. If I run configure without the cross-compilation flags, just a normal build, the missing cmake files seems to be installed.
So it boils down to convincing configure to produce the cmake files...
So: rephrasing my question: Has anyone a clue about what configure requires to include the cmake support? Is it just disabled for cross-compilations?
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hm... At a closer look, seems to be about configuration. If I run configure without the cross-compilation flags, just a normal build, the missing cmake files seems to be installed.
So it boils down to convincing configure to produce the cmake files...
So: rephrasing my question: Has anyone a clue about what configure requires to include the cmake support? Is it just disabled for cross-compilations?
@Alec-Leamas said in QT 14.2 cmake: Cannot find Qt5Widgets et. al.:
So it boils down to convincing configure to produce the cmake files...
I think you're right. I've checked the Android build made by Qt Company - it does contain cmake files in
lib/cmake, same as desktop builds do. So:So: rephrasing my question: Has anyone a clue about what configure requires to include the cmake support? Is it just disabled for cross-compilations?
It's not disabled if official packages contain it. It must be some
configurequirk... unfortunately I don't know what it is, sorry.I'll try a manual build on my side and report results (if they will be interesting).
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I think my NDK is too new, it fails every time I try to compile. :-/ Sorry, that's it from me, I don't have time to try it more. I have compared your
configureflags with mine and they look OK. -
Thanks for your efforts!
For now, I 'll probably need to hack some FindQtXXX.cmake files myself from scratch. Boring, but shouldn't be that complicated (at least as long as I stay away from the COMPONENTS stuff...)
EDIT: BTW: I'm using the latest ndk (21), no problems besides the one described her.
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I think you can just take cmake files from prebuilt Qt, they may need a slight modification to trim the number of ABIs but apart from that they should work I think.
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I think you can just take cmake files from prebuilt Qt, they may need a slight modification to trim the number of ABIs but apart from that they should work I think.
@sierdzio It's not as simple as 'cmake files'. In particular, is the FindQt5Widgets.cmake and friends there? I also get a bunch of cmake files, but many important ones like this is missing.
Anyway, I have hacked a FindQt5.cmake script and moved on. It's kind of simple, but does the job.
If anyone is curious it's here for a while: https://pastebin.com/Tz0hTBTn
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If anyone is curious it's here for a while: https://pastebin.com/Tz0hTBTn
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@sierdzio It's not as simple as 'cmake files'. In particular, is the FindQt5Widgets.cmake and friends there? I also get a bunch of cmake files, but many important ones like this is missing.
Anyway, I have hacked a FindQt5.cmake script and moved on. It's kind of simple, but does the job.
If anyone is curious it's here for a while: https://pastebin.com/Tz0hTBTn
@Alec-Leamas said in QT 14.2 cmake: Cannot find Qt5Widgets et. al.:
@sierdzio It's not as simple as 'cmake files'. In particular, is the FindQt5Widgets.cmake and friends there?
You're right,
FindQt5x.cmakeare not there. But, even without them, cmake works fine with prebuilt Qt - so perhaps these files are not needed at all? -
@Alec-Leamas said in QT 14.2 cmake: Cannot find Qt5Widgets et. al.:
@sierdzio It's not as simple as 'cmake files'. In particular, is the FindQt5Widgets.cmake and friends there?
You're right,
FindQt5x.cmakeare not there. But, even without them, cmake works fine with prebuilt Qt - so perhaps these files are not needed at all?@sierdzio I was too quick, it's about other files. Here is the situation, comparing the "normal" installation with a cross-compile, focusing on the Widgets stuff :
$ find /opt/dont-use-qt5/ -name \*.cmake | grep Widgets /opt/dont-use-qt5/lib/cmake/Qt5Widgets/Qt5WidgetsMacros.cmake /opt/dont-use-qt5/lib/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake /opt/dont-use-qt5/lib/cmake/Qt5Widgets/Qt5WidgetsConfigVersion.cmake /opt/dont-use-qt5/lib/cmake/Qt5Widgets/Qt5WidgetsConfigExtras.cmake /opt/dont-use-qt5/lib/cmake/Qt5QuickWidgets/Qt5QuickWidgetsConfig.cmake /opt/dont-use-qt5/lib/cmake/Qt5QuickWidgets/Qt5QuickWidgetsConfigVersion.cmake /opt/dont-use-qt5/lib/cmake/Qt5MultimediaWidgets/Qt5MultimediaWidgetsConfigVersion.cmake /opt/dont-use-qt5/lib/cmake/Qt5MultimediaWidgets/Qt5MultimediaWidgetsConfig.cmake $ find -L ~/lib/android-sysroot/usr/Qt5/ -name \*.cmake | grep Widgets $i. e., the Widgets stuff is just missing. Situation is similar for other modules
Since I basically trust the qt devs, I assume it's because my usecase isn't supported. This means that I cannot use future versions without checking them.
Ergo: better use my own stuff...
