Chacha20poly1305 versions after and including 0.11.0-pre.1 require alloc on no_std.

[ionspin]

chacha20poly1305 = { version = "0.11.0-pre.1", default-features = false, features = [] }

Build result:

error: no global memory allocator found but one is required; link to std or add `#[global_allocator]` to a static item that implements the GlobalAlloc trait

chacha20poly1305 = { version = "0.10.1", default-features = false, features = [] } builds successfuly.

I might be missing something obvious, it's late here :)

[tarcieri]

My best guess is chacha20poly1305 has a hard requirement for chacha20/zeroize, and it looks like chacha20 is pulling zeroize in without default-features = false, which is linking liballoc

[newpavlov]

chacha20poly1305 has a hard requirement for chacha20/zeroize

But why is it a hard requirement? Most other crates have optional support for zeroize.

chacha20 is pulling zeroize in without default-features = false

Yeah, the problem is here.

[tarcieri]

It was likely introduced in recent changes. I’m on a phone so I would suggest using the git history to answer your question.

[newpavlov]

Hm, it looks like zeroize was an unconditional dependency since v0.1 times. I guess it was an oversight, which did not get noticed until now. Same for some other AEAD crates.