ExternalProject: Add boolean option `SILENT` to ExternalProject_Add_Step
This allows one to pass SILENT <bool>
to ExternalProject_Add_Step
.
When TRUE no COMMENT will be printed when executing this step in
the build phase.
Effectively COMMENT ""
will be passed to the underlaying
add_custom_step
.
Topic-rename: ExternalProject-step-SILENT
Edited by Brad King