c9b3ac2210
When using qt-cmake-standalone-test, we didn't tell CMake to use the same C++ language standard that Qt used when it was configured. We did tell CMake to do that when configuring tests with qt-internal-configure-tests via the qt_build_tests macro. To ensure the proper standard is set, we also need to find_package(Qt6Core), because the std flag is derived from the QT_FEATURE_cxxyz flag which is set by Core. Change-Id: Ia41f2a24983ddab0107a6446743f7b054df8c033 Reviewed-by: Oliver Wolff <oliver.wolff@qt.io> Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io> (cherry picked from commit effd6f63f1a4b7dc7b5e6bca41594f1d1562a713) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>