[cmake-developers] Quiet option for cmake

[Craig Scott]

A user has recently been asking
<https://gitlab.kitware.com/cmake/cmake/issues/18257> about reducing the
output coming from a FetchContent population when nothing needs to be done
(i.e. the content has already been populated). Because this is implemented
as a sub-build, you always see the following extra lines in the main
project's configure output (during the main configure, I'm not talking here
about the same messages at the end of the main configure):

-- Configuring done
-- Generating done
-- Build files have been written to: ...

I'm wondering if it makes sense to add support for a --quiet or --silent
option to cmake (and probably ccmake and cmake gui) which would skip these
messages? It would be an option question whether ordinary status messages
and messages which don't set any message mode should still be output for
such an option (maybe they would for --quiet but not for --silent). While
FetchContent is the motivation for this, perhaps other uses of CMake may
also find it useful as well.

-- 
Craig Scott
Melbourne, Australia
https://crascit.com

New book released: Professional CMake: A Practical Guide
<https://crascit.com/professional-cmake/>
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