Fix: Find Qt5 (if enabled) in ElementalConfig.cmake #275
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If Qt5 has been enabled during build, then e.g. target Qt5::Widgets is exported as a install dependency via ElementalTargets.cmake. Thus ElementalConfig.cmake must find Qt5 and import these Qt5 targets or else the user will get errors like: CMake Error at CMakeLists.txt:... (add_executable): Target "..." links to target "Qt5::Widgets" but the target was not found. Perhaps a find_package() call is missing for an IMPORTED target, or an ALIAS target is missing?
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JM1
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May 10, 2019
Elemental exports targets which link to Qt5 CMake targets but those are not loaded when including Elemental via CMake, breaking user libraries. Ref.: elemental/Elemental#275
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If Qt5 has been enabled during build, then e.g. target Qt5::Widgets is exported
as a install dependency via ElementalTargets.cmake. Thus ElementalConfig.cmake
must find Qt5 and import these Qt5 targets or else the user will get errors like:
CMake Error at CMakeLists.txt:... (add_executable):
Target "..." links to target "Qt5::Widgets" but the target was not found.
Perhaps a find_package() call is missing for an IMPORTED target, or an
ALIAS target is missing?