acfoltzer (Mar 30 2020 at 18:04): acfoltzer (Mar 30 2020 at 18:04):Some of our users have been struggling with figuring out whether or not a particular crate is good to go on wasm32-wasi. Much of that is due to crates that build/link native code, but some of it is also the fact that some of the functions in std are present but panic when called. I'm wondering just how bad an idea it'd be to omit the functions we don't support, rather than having them fail at runtime, so that these would be compile-time failures instead?
Alex Crichton (Mar 30 2020 at 18:32):@acfoltzer this is definitely a topic of historical hot debate in rust
Alex Crichton (Mar 30 2020 at 18:32):it's unfortunately a pretty tricky one though
Alex Crichton (Mar 30 2020 at 18:32):the short answer is that this wouldn't be easily done, but it's certainly possible
Alex Crichton (Mar 30 2020 at 18:33):this'd be something to bring up w/ the libs team or on users.r-l.o
Alex Crichton (Mar 30 2020 at 18:33):most likely
acfoltzer (Mar 30 2020 at 18:34):thanks. yeah, I figured there was some story about it. I'm guessing the horse is probably out of the barn but I'll poke around a bit further
acfoltzer (Mar 30 2020 at 18:35):I've already poked one hornet's nest with FFI-unwind, not sure I'm up for another one until that's resolved :)
Alex Crichton (Mar 30 2020 at 18:55):@acfoltzer do you have an idea of what sort of apis folks are most surprised don't work?
Alex Crichton (Mar 30 2020 at 18:55):like is it all one set of APIs? or is it basically a smattering all over?
acfoltzer (Mar 30 2020 at 18:55):I think it's mostly the one in Thread::new(), where a library spins up a worker thread or something
acfoltzer (Mar 30 2020 at 18:55):they're not really encountering it in code they write directly
acfoltzer (Mar 30 2020 at 18:56):or something tries to get its threadid
Alex Crichton (Mar 30 2020 at 18:56):ah ok makes sense
Alex Crichton (Mar 30 2020 at 18:56):we can probably fix the threadid thing
Alex Crichton (Mar 30 2020 at 18:56):Thread::new() is pretty fundamental though :(
acfoltzer (Mar 30 2020 at 18:56):(we are still on 1.40.0 for WASI snapshot reasons, so this may be out of date feedback)
acfoltzer (Mar 30 2020 at 18:57):yeah definitely. probably don't want to mess with that one till coroutines land
Last updated: Dec 23 2024 at 12:05 UTC