New in version 3.1.

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.