Specify verbosity of installation script code generated by the install() command (using the file(INSTALL) command). For paths that are newly installed or updated, installation may print lines like:

-- Installing: /some/destination/path

For paths that are already up to date, installation may print lines like:

-- Up-to-date: /some/destination/path

The CMAKE_INSTALL_MESSAGE variable may be set to control which messages are printed:

Print both Installing and Up-to-date messages.
Print Installing but not Up-to-date messages.
Print neither Installing nor Up-to-date messages.

Other values have undefined behavior and may not be diagnosed.

If this variable is not set, the default behavior is ALWAYS.