Raise the minimum required CMake version from 3.20.0 (documented as
3.20.5) to 3.28.0, which is satisfied by the CMake 3.28.3 package
shipped in the Ubuntu 24.04 LTS repositories. Ubuntu 24.04 is the
current Ubuntu LTS release targeted by the Zephyr getting started
guide, and by the time of the next Zephyr release, Ubuntu 22.04 will be
within months of its end of standard support. Users of distributions
shipping an older CMake can use the Kitware APT repository or a
pip-installed CMake, as the documentation already suggests.
Raising the floor to 3.28 unlocks a range of modern CMake features for
the build system, among which the cmake_file_api() command (3.27),
file(COPY_FILE) (3.21), block()/endblock() (3.25), and allows removal
of several version-conditional workarounds.
The tree-wide cmake_minimum_required() occurrences in samples, tests
and boards are updated accordingly, together with the documentation
and the sysbuild CMake presets. The IAR C-STAT integration keeps its
own higher requirement (4.1.0).
Assisted-by: Claude:fable-5
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
a119dbf957