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All KWSys C symbol names begin with the KWSYS_NAMESPACE defined at configuration time. For ease of editing we write canonical names with the prefix 'kwsys' and use macros to map them to the configured prefix at preprocessing time. In the case of standalone KWSys, the prefix is 'kwsys', so the macros were previously defined to their own names. We now skip defining the macros in the identity case so that the final symbol names are never themselves macros. This will allow the symbols to be further transformed behind the scenes to help linkers in special cases on some platforms.
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.