esp-hal
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esp-rs
Build failure of esp-rom-sys for esp32
Bug description
Project generated with esp-generate fails with the following error
error[E0599]: no method named `to_ascii_lowercase` found for type `i8` in the current scope
--> /usr/local/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/esp-rom-sys-0.1.3/src/lib.rs:86:31
|
86 | let val = (*s1_i).to_ascii_lowercase() as i32 - (*s2_i).to_ascii_lowercase() as i32;
| ^^^^^^^^^^^^^^^^^^ method not found in `i8`
error[E0599]: no method named `to_ascii_lowercase` found for type `i8` in the current scope
--> /usr/local/cargo/registry/src/index.crates.io-1949cf8c6b5b557f/esp-rom-sys-0.1.3/src/lib.rs:86:69
|
86 | let val = (*s1_i).to_ascii_lowercase() as i32 - (*s2_i).to_ascii_lowercase() as i32;
| ^^^
To Reproduce
- install toolchain with espup
- generate
esp32project withesp-generate(options don't seem to matter, I tried different ones) - run
cargo run
Expected behavior
The library compiles
Environment
- Target device:
esp32 - Crate name and version:
esp-rom-sys0.1.3
rustc 1.90.0-nightly (abf50ae2e 2025-09-16) (1.90.0.0)
binary: rustc
commit-hash: abf50ae2e46066e67e29fe856f9764c23aa9a3ca
commit-date: 2025-09-16
host: x86_64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.1
Also, I'm running this inside a devcontainer that's generated with
FROM rust:latest
RUN cargo install espup cargo-binstall --locked
RUN espup install
RUN cargo binstall esp-generate espflash probe-rs-tools
RUN cargo install esp-config --features=tui --locked
RUN sh -c "echo \"source /root/export-esp.sh\" >>/root/.profile"
I just tried with rust:1.89 as a base image, which solves the build issue. The esp rustc is still 1.90, so I don't know why that changes anything.
