cosmopolitan

• Replaces musl
• Poor bootstrappability; requires cosmocc which is a zip file containing 2 GB worth of binaries to bootstrap itself
• Provides a platform independent libc (c standard library) that gets statically compiled into your app
• Fast implementations of functions (e.g. memcpy() and strcpy()) given it is very focused on x86-64 and optimizations

References

• https://github.com/jart/cosmopolitan
• https://github.com/jart/cosmopolitan/issues/50
• https://github.com/jart/cosmopolitan/issues/820
• https://github.com/jart/cosmopolitan/issues/1117
• https://raymii.org/s/blog/Bare_Metal_Boot_to_Vi.html