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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It is very fast.
It will automatically clean-up old files.
Not bound to C/C++
Pro Cross platform
Supports Linux, OSX, and Windows.
Tup supports writing build definitions using Lua or Tupfiles.
Con Variants not working on Windows
The solution for having different build configuration (think Release/Debug) is broken on Windows.