On 1, the libc we're working on[1] is based on musl. It won't ever be 100% compatible with all code, because that runs into constraints imposed by our security goals, but the vast majority of code should eventually just compile when targeting this. (Eventually, because this is all early days.)
On 2, yes, that is explicitly the goals. I'd add that it's not just about OSes, but also about platforms and hardware form factors.
On 1, the libc we're working on[1] is based on musl. It won't ever be 100% compatible with all code, because that runs into constraints imposed by our security goals, but the vast majority of code should eventually just compile when targeting this. (Eventually, because this is all early days.)
On 2, yes, that is explicitly the goals. I'd add that it's not just about OSes, but also about platforms and hardware form factors.
[1] https://github.com/CraneStation/wasi-sysroot