Rust 'target is not supported' error when solana-program version at or above 1.10

Question

If I run any program with the solana-program dependency set at or above 1.10 I get the following error:

error: target is not supported, for more information see: https://docs.rs/getrandom/#unsupported-targets
   --> /Users/James/.cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.1.16/src/lib.rs:267:9
    |
267 | /         compile_error!("\
268 | |             target is not supported, for more information see: \
269 | |             https://docs.rs/getrandom/#unsupported-targets\
270 | |         ");
    | |___________^

error[E0433]: failed to resolve: use of undeclared crate or module `imp`
   --> /Users/James/.cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.1.16/src/lib.rs:291:5
    |
291 |     imp::getrandom_inner(dest)
    |     ^^^ use of undeclared crate or module `imp`

Even when solana-program is the only dependency I have and I just do a simple "Hello, world!" program I still get the error, so I'm certain it's not a dependency I'm explicitly pulling in. If I set the version to 1.9.5 or 1.8.something I don't have an issue. Would love to know if anyone else has seen this happen. It's happened to me on multiple Rust versions, so I'm assuming it's not that but at this point idk.

Rust version: 1.62.0
Solana CLI version: 1.8.15
Rustup version: 1.25.1

Answer 1

I put this in the comments above but for the sake of clarity here's my full answer here:

1. I was not as precise as I should have been with specifying the version of the solana-program dependency in the cargo.toml file. For example, 1.10.7 can result in cargo resolving to any version >= 1.10.7 and < 2.0.0, so cargo was resolving to 1.11.3. To solve this, I'm now using ~1.10.7 which ensures that the version remains < 1.11.0.
2. This matters because my issue seems to only happen when cargo resolves solana-program to a version >= 1.11.0
3. I am still getting the error on versions >= 1.11.0, but from what I can tell that may be because it's not a stable version. I'm still not 100% on that part, but for now I'm happy to work with versions in the 1.10.x range.

You can see more info about specifying Rust dependencies here

Answer 2

This is what I found on the Solana GitHub docs.

To work around this dependency issue, add the following dependency to the program's Cargo.toml:

getrandom = { version = "0.1.14", features = ["dummy"] }

or if the dependency is on getrandom v0.2 add:

getrandom = { version = "0.2.2", features = ["custom"] }

Using version 0.2.2 worked for me.

Answer 3

Update the Cargo.toml to contain the following:

getrandom = { version = "0.2.2", features = ["custom"] }

Answer 4

The answer from @JohnVersus helped me. The docs have now been moved to: https://solana.com/docs/programs/lang-rust#depending-on-rand.