Zapcc Caching C++ Compiler Open-Sourced

Written by Michael Larabel in LLVM on 17 June 2018 at 09:09 AM EDT. 36 Comments
Remember the Zapcc compiler that focused on lightning fast compiler times? It's now been open-sourced.

Zapcc is the LLVM/Clang-based C++ compiler that we have been covering since 2015 when it began promoting itself as a much faster C++ compiler than Clang itself. Zapcc employs aggressive caching and other techniques in an effort to significantly speed up compile times while being a drop-in replacement to GCC or Clang. Last year Zapcc reached the v1.0 milestone, but we haven't heard much since until finding out this weekend that it's been open-sourced.

The folks from Ceemple, the company behind Zapcc, wrote in this morning to share that they have open-sourced Zapcc. This faster C++ compiler is open-source under the LLVM license as a result of user requests. They hope that Zapcc being open-source will only accelerate the development of this speed-focused C++ compiler.

The code is now open-sourced on GitHub and the build process/requirements come down to being the same as compiling Clang. As time allows I'll try to work on some fresh benchmarks of Zapcc.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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