Cannot compile `esp-idf-sys` when parent project has no commits about esp-idf-sys HOT 5 CLOSED

Hi @davidcole1340, a lot has changed since you reported this issue, would you mind trying again and seeing how you get on?

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@MabezDev Still seems to be reproducable with the attached zip file

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The commit issue seems to be related to pio.

We now offer a native build which uses esp-idf's native cmake build system.

Here is the updated project: esp-test-error-fixed.zip

Please note that its still experimental, and I ended up finding an issue which I have opened here: #20

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I'm pretty sure this is a problem with the platformio-espressif32 "platform" of PlatformIO. If my suspicions are confirmed (looking at it), I'll open a bug at their repo.

As for the app_main symbol, in your binary crate you need to depend on esp-idf-sys with [features = "binstart"] and you need to reference the module from your src/main.rs, or else the app_main start symbol will not be linked in, like so:

// Necessary, so that the `app_main` symbol exported by the `binstart` feature of esp-if-sys is linked
#[allow(unused_imports)]
use esp_idf_sys;

I'm preparing a demo named rust-esp32-std-mini which is the absolute minimal set of dependencies and setup for a project so that you can do println!("Hello, world!") on Rust+ESP-IDF (basically a minimally-updated version of what cargo new rust-esp32-std-mini would generate for you).

By the way: the current rust-esp32-std-hello will likely be renamed to rust-esp32-std-demo, as it is anything but a Hello, world! example in the meantime, and it gets difficult to figure out what is necessary and what isn't to do a "Hello, world" with Rust + STD + ESP-IDF. Which isn't much really.

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With the switch to the cmake esp-idf build system by default, this should no longer be an issue.

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