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This option eliminates extended functions in strings eagerly. This was incorrectly done at ppRewrite previously, which should not add lemmas. Instead, this makes this technique into a preprocessing pass. To do this, the interface for the strings preprocessor was cleaned to have fewer dependencies, and made to track a cache internally.

Fixes #5608, fixes #5745, fixes #5767, fixes #5771, fixes #5406.

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License: BSD CI Coverage


CVC4 is a tool for determining the satisfiability of a first order formula modulo a first order theory (or a combination of such theories). It is the fourth in the Cooperating Validity Checker family of tools (CVC, CVC Lite, CVC3) but does not directly incorporate code from any previous version.

If you are using CVC4 in your work, or incorporating it into software of your own, we invite you to send us a description and link to your project/software, so that we can link it on our Third Party Applications page.

CVC4 is intended to be an open and extensible SMT engine. It can be used as a stand-alone tool or as a library. It has been designed to increase the performance and reduce the memory overhead of its predecessors. It is written entirely in C++ and is released under an open-source software license (see file COPYING).


CVC4's website is available at:


Documentation for users of CVC4 is available at:

Documentation for developers is available at:


The latest version of CVC4 is available on GitHub:

Source tar balls and binaries for releases and latest stable builds of the master branch on GitHub can be found here.

Build and Dependencies

CVC4 can be built on Linux and macOS. For Windows, CVC4 can be cross-compiled using Mingw-w64.

For detailed build and installation instructions on these platforms, see file

Bug Reports

If you need to report a bug with CVC4, or make a feature request, please visit our bugtracker at our GitHub issues page. We are very grateful for bug reports, as they help us improve CVC4.


Please refer to our contributing guidelines.


For a full list of authors, please refer to the AUTHORS file.


CVC4 is an efficient open-source automatic theorem prover for satisfiability modulo theories (SMT) problems.




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