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 + NetBSD + BIOS with the best possible performance and the tiniest footprint imaginable. For further details, read Cosmopolitan Third Edition, the Cosmo README, and the Cosmopolitan Toolchain README.

This v3.2.4 release of Cosmopolitan introduces C++ exceptions and RTTI, which can be enabled by passing the -fexceptions and/or -rtti flags to your cosmocc compiler.

• b580080af tool/cosmocc: Allow exceptions and rtti (#1074)
• b0566348b third_party/libcxxabi: Add test suite (#1076)
• b09096691 third_party: Add libunwind (#1053)
• 81ce2e4cb Call thread finalizers on exit()
• 94bab1618 Add fixes to libunwind (#1069)
• 8b33204f3 Add LLVM libcxxabi (#1063)
• 6ab01716c Fix aarch64 setjmp abi

If C is your preferred language, then you can use Cosmopolitan garbage collection via our new gc() macro. To enable this feature, you need to pass the -mcosmo flag to cosmocc. For example, to say gc(malloc(32)) means that memory will be reclaimed when your function returns, and it will be reclaimed by pthread_exit() too. There's also defer() which is generalized and allows any callback. Pointers exist on a shadow stack.

• a4b455185 Bring back gc() function

Here's some additional developments since the last release:

• df648fb17 Revert apeinstall.sh binfmt flags (#1072)
• cafea9a0a Flesh out tool/zsh/mkofs
• 6cb0354e1 mkofs improvements
• 16099801c zsh mkofs tool

Known Issues

• Compiling the mono repo on Windows is currently broken due to #1010. In the meantime, use cosmopolitan-3.2.tar.gz