A file-based cross platform build system. It uses a directed acyclic graph (DAG) and is therefor pretty fast. Updates are performed with very little overhead.
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Tup supports writing build definitions using Lua or Tupfiles.
Not bound to C/C++
It will automatically clean-up old files.
It is very fast.
Pro Cross platform
Supports Linux, OSX, and Windows.
Con Variants not working on Windows
The solution for having different build configuration (think Release/Debug) is broken on Windows.