unresolved imports in target xtensa-esp32-espidf

[javoerro]

While compiling async-nats v0.33.0 for target xtensa-esp32-espidf mio compile error emerges:

Compiling mio v0.8.10
error[E0432]: unresolved imports `self::selector::event`, `self::selector::Event`, `self::selector::Events`, `self::selector::Selector`
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/mod.rs:18:37
   |
18 |     pub(crate) use self::selector::{event, Event, Events, Selector};
   |                                     ^^^^^  ^^^^^  ^^^^^^  ^^^^^^^^ no `Selector` in `sys::unix::selector`
   |                                     |      |      |
   |                                     |      |      no `Events` in `sys::unix::selector`
   |                                     |      no `Event` in `sys::unix::selector`
   |                                     no `event` in `sys::unix::selector`
   |
   = help: consider importing this module instead:
           crate::event
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:21:30
   |
21 | pub(crate) use self::epoll::{event, Event, Events, Selector};
   |                              ^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:35:29
   |
35 | pub(crate) use self::poll::{event, Event, Events, Selector};
   |                             ^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:70:31
   |
70 | pub(crate) use self::kqueue::{event, Event, Events, Selector};
   |                               ^^^^^
   = help: consider importing this struct through its public re-export instead:
           crate::event::Event
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:21:37
   |
21 | pub(crate) use self::epoll::{event, Event, Events, Selector};
   |                                     ^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:35:36
   |
35 | pub(crate) use self::poll::{event, Event, Events, Selector};
   |                                    ^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:70:38
   |
70 | pub(crate) use self::kqueue::{event, Event, Events, Selector};
   |                                      ^^^^^
   = help: consider importing this struct through its public re-export instead:
           crate::Events
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:21:44
   |
21 | pub(crate) use self::epoll::{event, Event, Events, Selector};
   |                                            ^^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:35:43
   |
35 | pub(crate) use self::poll::{event, Event, Events, Selector};
   |                                           ^^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:70:45
   |
70 | pub(crate) use self::kqueue::{event, Event, Events, Selector};
   |                                             ^^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:21:52
   |
21 | pub(crate) use self::epoll::{event, Event, Events, Selector};
   |                                                    ^^^^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:35:51
   |
35 | pub(crate) use self::poll::{event, Event, Events, Selector};
   |                                                   ^^^^^^^^
note: found an item that was configured out
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/selector/mod.rs:70:53
   |
70 | pub(crate) use self::kqueue::{event, Event, Events, Selector};
   |                                                     ^^^^^^^^

error[E0412]: cannot find type `WakerInternal` in this scope
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/waker.rs:38:16
   |
38 |         waker: WakerInternal,
   |                ^^^^^^^^^^^^^ not found in this scope
   |
help: consider importing this struct
   |
31 +     use crate::sys::unix::waker::eventfd::WakerInternal;
   |

error[E0433]: failed to resolve: use of undeclared type `WakerInternal`
  --> /home/javoerro/.cargo/registry/src/index.crates.io-6f17d22bba15001f/mio-0.8.10/src/sys/unix/waker.rs:43:25
   |
43 |             let waker = WakerInternal::new()?;
   |                         ^^^^^^^^^^^^^ use of undeclared type `WakerInternal`
   |
help: consider importing this struct
   |
31 +     use crate::sys::unix::waker::eventfd::WakerInternal;
   |

Some errors have detailed explanations: E0412, E0432, E0433.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `mio` (lib) due to 3 previous errors

[Thomasdezeeuw]

@jasta could you help here, seeing as you wrote the ESP-IDF implementation?

[javoerro]

I would like to add more information, i am using esp-idf-template for generating the project. thus, cargo is invoked by cmake to build the component.

the Cargo.toml is:

[package]
name = "rust-esp-async-nats"
version = "0.1.0"
authors = ["javoerro"]
edition = "2021"
resolver = "2"
rust-version = "1.71"

[lib]
crate-type = ["staticlib"]

[profile.release]
opt-level = "s"

[profile.dev]
debug = true # Symbols are nice and they don't increase the size on Flash
opt-level = "z"
[features]
default = ["std", "embassy", "esp-idf-svc/native"]

pio = ["esp-idf-svc/pio"]
std = ["alloc", "esp-idf-svc/std"]
alloc = ["esp-idf-svc/alloc"]
nightly = ["esp-idf-svc/nightly"]
experimental = ["esp-idf-svc/experimental"]
embassy = ["esp-idf-svc/embassy-sync", "esp-idf-svc/critical-section", "esp-idf-svc/embassy-time-driver"]

[dependencies]
log = { version = "0.4", default-features = false }
esp-idf-svc = { version = "0.47.1", default-features = false }
tokio = { version = "1.35.1", features = ["rt"] }
futures = "0.3.30"
async-nats = "0.33.0"
bytes = "1.5.0"
anyhow = "1"


[build-dependencies]
embuild = { version = "0.31.4", features = ["elf"] }

[javoerro]

after several checks i found issues in the configuration of CMakeLists.txt in my project because i was using esp-idf version < 5.x causing a compilation without rustflags.
mio_unsupported_force_poll_poll works perfectly for mio in espidf target, sorry for the inconvenience!

[lorenzo-pirchio]

Hello,
I have the same problem as @javoerro writing a project in rust for esp32 while compiling xmpp.
Can anyone help me to fix that? Which parts in CMakeLists.txt do I have to change?
Thanks

[Thomasdezeeuw]

@lorenzo-pirchio after #1789 no extra flags will be needed, but until that makes it to a release you'll need to set RUSTFLAGS='--cfg mio_unsupported_force_poll_poll'.

[lorenzo-pirchio]

@Thomasdezeeuw Should I add this line in my Espressif folder or my project folder?
Since I changed the Cargo target directory to another folder, because I had problems with Windows, which folder should I consider?
I found different CMakeList.txt in the project.
Could you tell me which one precisely should I add the line you wrote to?
I'm sorry for asking so many questions, but I just started working on both rust and esp32.
Thanks

[Thomasdezeeuw]

@lorenzo-pirchio I don't develop for ESP myself, so I can't tell you exactly where to add it.