UUID() does not produce proper UUIDs

[ShonFrazier]

Always produces 00000000-0000-4000-8000-000000000000. This may have been chosen at random (once), but lacks sufficient entropy.

[yonihemi]

I've had this happen several months ago but wasn't able to reproduce since. Can you share the setup your seeing this in?
Also, can you try adding import CoreFoundation and see if it work?

[ShonFrazier]

when importing both Foundation and CoreFoundation I get the same output.

[kateinoigakukun]

In WASI, /dev is not predefined and this line always fails to read the randomized content, so the buffer is always zero.
https://github.com/swiftwasm/swift-corelibs-foundation/blob/7cbab5eb4b2b9f0643c27801f35e591381e64d31/Sources/UUID/uuid.c#L93

We should use random_get WASI API instead of reading /dev/urandom

[ShonFrazier]

if there's a TARGET_OS_WASI, probably just needs to be OR'd with Windows

[kateinoigakukun]

Resolved by swiftwasm/swift-corelibs-foundation#323

[MaxDesiatov]

TWIMC, the fix has been included in SwiftWasm 5.4.0