0a83aa6f57
On Windows the KWSys System package generates escapes for command-line arguments. This fix enables quoting of the empty string as an argument. This also adds a test to pass an empty argument to a custom command.
KWSys provides a platform-independent API to many common system features that are implemented differently on every platform. This library is intended to be shared among many projects, so it has a configurable namespace. Each project should configure KWSys to use a namespace unique to itself. See comments in CMakeLists.txt for details. You are probably reading this file in the source tree of a surrounding project. In that case, see "../README.kwsys" for details of using KWSys in your project.