Version mkgmap-r4277 was committed by gerd on Wed, 13 Feb 2019 partly revert r4276: don't print message Don't say "nothing to do" when no input file was given. Options like --checkstyle, --version, --help etc. work without an input file http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4277