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use std::{env, error::Error, fs, path::PathBuf};
fn main() -> Result<(), Box<dyn Error>> {
// Read the linker script
let mut linker_script = fs::read_to_string("defmt.x.in")?;
// Optionally exclude default panic handler
if cfg!(feature = "avoid-default-panic") {
linker_script = avoid_default_panic(linker_script);
}
// Put the linker script somewhere the linker can find it
let out = &PathBuf::from(env::var("OUT_DIR")?);
fs::write(out.join("defmt.x"), linker_script)?;
println!("cargo:rustc-link-search={}", out.display());
let target = env::var("TARGET")?;
// `"atomic-cas": false` in `--print target-spec-json`
// last updated: rust 1.48.0
match &target[..] {
"avr-gnu-base"
| "msp430-none-elf"
| "riscv32i-unknown-none-elf"
| "riscv32imc-unknown-none-elf"
| "thumbv4t-none-eabi"
| "thumbv6m-none-eabi" => {
println!("cargo:rustc-cfg=no_cas");
}
_ => {}
}
// allow #[cfg(cfg_name)]
for cfg_name in ["c_variadic", "no_cas"] {
println!("cargo:rustc-check-cfg=cfg({cfg_name})");
}
Ok(())
}
fn avoid_default_panic(linker_script: String) -> String {
linker_script.replacen("PROVIDE(_defmt_panic = __defmt_default_panic);", "", 1)
}
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