{"record":{"id":"0827b7fc9995a111","repo":"zeroclaw-labs/zeroclaw","slug":"build-failed-n","errorCode":null,"errorMessage":"Build failed:\\n{}","messagePattern":"Build failed:\\\\n(.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/zeroclaw-hardware/src/peripherals/nucleo_flash.rs","lineNumber":50,"sourceCode":"    let repo_root = PathBuf::from(env!(\"CARGO_MANIFEST_DIR\"));\n    let firmware_dir = repo_root.join(\"firmware\").join(\"nucleo\");\n    if !firmware_dir.join(\"Cargo.toml\").exists() {\n        anyhow::bail!(\n            \"Nucleo firmware not found at {}. Run from zeroclaw repo root.\",\n            firmware_dir.display()\n        );\n    }\n\n    println!(\"Building ZeroClaw Nucleo firmware...\");\n    let build = Command::new(\"cargo\")\n        .args([\"build\", \"--release\", \"--target\", TARGET])\n        .current_dir(&firmware_dir)\n        .output()\n        .context(\"cargo build failed\")?;\n\n    if !build.status.success() {\n        let stderr = String::from_utf8_lossy(&build.stderr);\n        anyhow::bail!(\"Build failed:\\n{}\", stderr);\n    }\n\n    let elf_path = firmware_dir\n        .join(\"target\")\n        .join(TARGET)\n        .join(\"release\")\n        .join(\"nucleo\");\n\n    if !elf_path.exists() {\n        anyhow::bail!(\n            \"Built binary not found at {}\",\n            elf_path.display().to_string()\n        );\n    }\n\n    println!(\"Flashing to Nucleo-F401RE (connect via USB)...\");\n    let flash = Command::new(\"probe-rs\")\n        .args([","sourceCodeStart":32,"sourceCodeEnd":68,"githubUrl":"https://github.com/zeroclaw-labs/zeroclaw/blob/88bb9c8533fc57ed7a03e36ca7c9ed2bf8336dcc/crates/zeroclaw-hardware/src/peripherals/nucleo_flash.rs#L32-L68","documentation":"flash_nucleo_firmware runs `cargo build --release --target thumbv7em-none-eabihf` inside firmware/nucleo and bails with cargo's stderr when the build exits non-zero. The most common cause is the embedded target not being installed in the active rustup toolchain; dependency fetch failures or firmware compile errors also surface here with full stderr.","triggerScenarios":"Calling flash_nucleo_firmware() without thumbv7em-none-eabihf installed (`rustup target list --installed`), offline without vendored crates.io dependencies, or with a compile error in firmware/nucleo itself.","commonSituations":"First embedded build on a new machine (rustup ships without cross targets); CI containers without cached targets; toolchain mismatch with firmware/nucleo's rust-toolchain.toml (Embassy firmware).","solutions":["Install the target: `rustup target add thumbv7em-none-eabihf`","Read the embedded stderr — can't-find-core errors name the exact target; code errors name file and line","Verify standalone: `cd firmware/nucleo && cargo build --release --target thumbv7em-none-eabihf`","Ensure the required toolchain is present and crates.io is reachable (or deps are vendored)"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"let installed = std::process::Command::new(\"rustup\")\n    .args([\"target\", \"list\", \"--installed\"])\n    .output()?;\nif !String::from_utf8_lossy(&installed.stdout).contains(\"thumbv7em-none-eabihf\") {\n    std::process::Command::new(\"rustup\")\n        .args([\"target\", \"add\", \"thumbv7em-none-eabihf\"])\n        .status()?;\n}\nflash_nucleo_firmware()?;","typeGuard":null,"tryCatchPattern":"if let Err(e) = flash_nucleo_firmware() {\n    let chain = format!(\"{e:#}\"); // embedded cargo stderr names the exact failure\n    if chain.contains(\"can't find crate for `core`\") || chain.contains(\"not installed\") {\n        // missing target: rustup target add thumbv7em-none-eabihf, then retry\n    }\n}","preventionTips":["Pre-install thumbv7em-none-eabihf on machines that flash Nucleo firmware","Build firmware/nucleo standalone once before automating the full flash flow","Pin the toolchain firmware/nucleo requires (rust-toolchain.toml) in CI images"],"tags":["cargo","cross-compilation","rustup-target","nucleo","embassy"],"backgroundTag":"cross-compilation-failed","analyzedSha":"88bb9c8533fc57ed7a03e36ca7c9ed2bf8336dcc","analyzedAt":"2026-08-23T01:07:41.857Z","schemaVersion":2},"datasetVersion":"2026-08-23T08:06:27.607Z"}