[CMake] --prefix commandline option?

[René J.V. Bertin]

Hello,

I discovered by accident that cmake (3.2.2) apparently respects the --prefix command line option, with a result that's somewhat different from setting CMAKE_INSTALL_PREFIX. I cannot seem to find any documentation on this feature though: have I overlooked it, or is this indeed an undocumented feature that shouldn't be used? If that latter option, is there a -DCMAKE_??? equivalent that has the same effects?

Thanks,
René