[CMake] add_custom_command( NOT REQUIRED ) ?

[J Decker]

Is there no way to specify 'I don't care if this command fails?' since I
don't have an OUTPUT anyway?

the thing is, I had a copy(all in directory, including subdirectories) and
I had an RM (things that don't belong) which included anything that was a
directory, but it didn't have a -f option and I didn't really care if it
was there (warn but don't stop? )
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