I’m not sure if it’s even used anywhere by anyone besides its author, to be honest ^-’

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As far as I can tell, working on Circle is his entire job. His title is compiler researcher or something.

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He does still work on it, just only inside Nvidia.

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The Orange C++ compiler for Windows is still actively maintained to this day https://github.com/LADSoft/OrangeC

For years they claimed C++14 but recently started supporting C++17

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