COMPILE_WARNING_AS_ERROR: Add options to treat warnings as errors
Add COMPILE_WARNING_AS_ERROR target property and supporting
CMAKE_COMPILE_WARNING_AS_ERROR variable.
COMPILE_WARNING_AS_ERROR is initialized by
CMAKE_COMPILE_WARNING_AS_ERROR. It is a boolean variable. If it is
true, it expands to a different flag depending on the compiler such that
any warnings at compile will be treated as errors.
Supports compiler ids that I could find a relevant flag for.
Issue: #19085
Edited by Brad King