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Cosmopolitan Libc makes C a build-once run-anywhere language, like Java, except it doesn't need an interpreter or virtual machine. Instead, it reconfigures stock GCC and Clang to output a POSIX-approved polyglot format that runs natively on Linux + Mac + Windows + FreeBSD + OpenBSD 7.3 + NetBSD + BIOS with the best performance and reliability. For further details, read the Cosmopolitan Toolchain README.

Our 3.0.0 release (published in Oct 2023) was when things started to work. This 4.0.0 release is when things have started to work well.

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