XHarbour Comparison
xHarbour is a fork of the earlier Harbour project. xHarbour takes a more aggressive approach to implementing new features in the language, while Harbour is more conservative in its approach, aiming first of all for an exact replication of Clipper behaviour and then implementing new features and extensions as a secondary consideration. It should also be noted that Harbour is supported on a wide variety of operating systems while xHarbour only really supports MS Windows and Linux 32-bit.
The Harbour developers have attempted to document all hidden behaviour in the Clipper language and test Harbour-compiled code alongside the same code compiled with Clipper to maintain compatibility.
The Harbour developers explicitly reject extensions to the language where those extensions would break Clipper compatibility. These rejections were soften recently since the new Harbour architecture allow extensions out of the core compiler.
A detailed comparison between extensions implemented in Harbour and xHarbour can be found in SVN repository of the project on SourceForge.
As of 2009–2010, Harbour has seen a huge increase in its adoption while xHarbour decline as can be seen on his mailing list.
Read more about this topic: Harbour (software)
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