[SOLVED] Cannot build kde-plasma/powerdevil

[roarinelk]

Hello,

Since a long time, I am unable to build kde-plasma/powerdevil without any changes.
The error is:

Code: Select all

/usr/include/qt6/QtWaylandClient/qwaylandclientextension.h: In instantiation of 'QWaylandClientExtensionTemplate<T, destruct>::QWaylandClientExtensionTemplate(int) [with T = ExternalBrightnessController; auto destruct = &QtWayland::kde_external_brightness_v1::destroy]':
required from here
/tmp-ram/portage/kde-plasma/powerdevil-6.5.5/work/powerdevil-6.5.5/daemon/controllers/externalbrightnesscontrol.cpp:12:127:   
   12 |     : QWaylandClientExtensionTemplate<ExternalBrightnessController, &QtWayland::kde_external_brightness_v1::destroy>(s_version)
      |                                                                                                                               ^
/usr/include/qt6/QtWaylandClient/qwaylandclientextension.h:57:32: error: '(QtWayland::kde_external_brightness_v1::destroy != 0)' is not a constant expression
   57 |         if constexpr (destruct != nullptr) {
      |                       ~~~~~~~~~^~~~~~~~~~
/usr/include/qt6/QtWaylandClient/qwaylandclientextension.h: In instantiation of 'QWaylandClientExtensionTemplate<T, destruct>::~QWaylandClientExtensionTemplate() [with T = ExternalBrightnessController; auto destruct = &QtWayland::kde_external_brightness_v1::destroy]':
required from here
/tmp-ram/portage/kde-plasma/powerdevil-6.5.5/work/powerdevil-6.5.5/daemon/controllers/externalbrightnesscontrol.cpp:12:127:   
   12 |     : QWaylandClientExtensionTemplate<ExternalBrightnessController, &QtWayland::kde_external_brightness_v1::destroy>(s_version)
      |                                                                                                                               ^
/usr/include/qt6/QtWaylandClient/qwaylandclientextension.h:68:32: error: '(QtWayland::kde_external_brightness_v1::destroy != 0)' is not a constant expression
   68 |         if constexpr (destruct != nullptr) {
      |                       ~~~~~~~~~^~~~~~~~~~

If I remove the constexpr's from both destructors (in qwaylandclientextension.h), the build succeeds. Only powerdevil is affected by this, all the other KDE packages I have build just fine. Powerdevil itself also works fine when built.
Can anyone please shed a light on this?

Thanks!

[Hu]

Please post the standard debugging data, that Portage should have told you to post when it reported that the package failed to build. In particular, I want to see the compiler version and the command line of the failed file. A minimal reproducible example would be nice, but not required yet.

[roarinelk]

I was able to solve this in the meantime. In one of the cross-toolchain files in /etc/portage/package.env/ was an entry "kde-plasma/powerdevil debug" , which I removed, since then it has compiled fine, including the latest version 6.6.0.
EDIT: this "debug" env set the cflag "-fno-delete-null-pointer-checks" which ultimately caused the build failure.