CMake/Help/prop_sf/KEEP_EXTENSION.rst

KEEP_EXTENSION
--------------

Make the output file have the same extension as the source file.

If this property is set then the file extension of the output file
will be the same as that of the source file.  Normally the output file
extension is computed based on the language of the source file, for
example ``.cxx`` will go to a ``.o`` extension.