Qt 6 Build System: Transitioning from qmake to CMake for Repeatable Environments

Qt 6 establishes CMake as the primary build system, replacing the legacy qmake .pro file structure for the framework and its official examples. This transition aims to improve dependency management via find_package() and target-based linking, which are critical for maintaining repeatable development environments across different machines.

While Qt Creator abstracts kit configurations, command-line repeatability relies on the correct discovery of the toolchain. There is a potential for configuration drift when projects attempt to maintain compatibility with both systems or when QT_DIR environment variables are not consistently managed across developer workstations.

• What is the recommended strategy for ensuring find_package(Qt6) resolves to the same toolchain version across disparate environments without hard-coding paths in CMakeLists.txt?
• How does the qt-cmake wrapper specifically resolve toolchain discovery compared to a standard CMake call?