Fixes for the less common platforms

[jonahbeckford]

Fixes the following:

1. Android 27 and earlier do not have getrandom but there is a recommended alternative. https://android.googlesource.com/platform/bionic/+/02ce401d1e2b31586c94c8b6999364bbbce27388/libc/include/sys/random.h
2. MSVC needed a definition for fill_bytes.

[hannesm]

Looks fine, thanks. Would you mind to look into the dkml failures?

[hannesm]

Oh, and how widely is android 27 distributed? Does it make sense to support it, or will it be end of life soon?

[jonahbeckford]

Looks fine, thanks. Would you mind to look into the dkml failures?

Do you need the DkML CI anymore? I'd love to remove it from Mirage since it was a stopgap until opam 2.2 was released. (I believe setup-ocaml can do OCaml 5.3 + Windows/MinGW GCC and hopefully OCaml 5.3 + MSVC. If it isn't obvious/simple how to do that then there is a usability/discoverability issue that should be filed with setup-ocaml and I'd like to know about that).

[jonahbeckford]

Oh, and how widely is android 27 distributed? Does it make sense to support it, or will it be end of life soon?

Android devices with API 27 will be in distribution (more importantly, supported by the Android NDK) for about 4+ years given the historical trends. It won't be end of life soon.

[hannesm]

Looks fine, thanks. Would you mind to look into the dkml failures?

Do you need the DkML CI anymore? I'd love to remove it from Mirage since it was a stopgap until opam 2.2 was released. (I believe setup-ocaml can do OCaml 5.3 + Windows/MinGW GCC and hopefully OCaml 5.3 + MSVC. If it isn't obvious/simple how to do that then there is a usability/discoverability issue that should be filed with setup-ocaml and I'd like to know about that).

Thanks for your headsup. I was not following any dkml/opam 2.2/what to do with the CI here.

I'm happy to remove the dkml CI here and replace it with "setup-ocaml/ocaml 5.3 + mingw gcc/msvc". I just don't have any clue which magic runes are necessary. If you feel like, please go ahead and do it (preferably in a separate PR).

[jonahbeckford]

Thanks.

I'll submit a separate PR to remove DkML CI.

I'll also file an issue with setup-ocaml to send an announcement (or re-announcement?) to discuss.ocaml.org to tell package maintainers like you how they can test Windows. There definitely should not be any magic runes (honestly, it should be automatic)!

[hannesm]

Thanks a lot!