Csmith

What Csmith is

Csmith is a free, open-source generator of random C programs used to look for compiler bugs through differential testing. It produces programs designed to avoid undefined behavior and includes statistics for each one. A documented workflow compiles generated programs with GCC and Clang and compares their outputs to help reveal compiler bugs. The project also suggests using Csmith to create material for a C-program test suite when users do not want to write one themselves. Command-line options displayed by `csmith -h` and `csmith -hh` let users customize random generation. Csmith runs locally on Linux and Windows. For Linux source builds, the Ubuntu instructions list g++, CMake, and m4; Windows build guidance covers Visual Studio or WSL. The project says it should build on most modern machines with a C++ compiler. Generated programs can contain infinite loops, so execution should be bounded with timeouts. The repository includes a COPYING license file. Bug reports and suggestions go to GitHub issues, and a mailing list is available for discussion; maintainers note replies may be delayed because they maintain the project in discretionary time.