To generate the toolchain files, use cmake(1) as per usual:

    $ cmake -B build -Wno-dev .

No building is required. Warnings are ignored, because GNUInstallDirs will complain about all languages being disabled.
There is also an unconventional install target:

    $ cd build/
    $ make install

"Unconventional," because there is no usual location to put toolchain files. Additionally, some toolchains distribute
with their definitions and some not (MinGW for instance; that's why we are here). This is an attempt to have some
consistency in my environment for my own convenience without using wrapper scripts for cmake.