bashANYrustuptoolchainsshow
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rustup showA first step when builds behave differently than expected across machines or CI.
Rust CLI Troubleshooting: rustup, Toolchains, Components, and Targets
Commands for fixing toolchain mismatches, missing components, and cross-compilation target issues in Rust CLI projects.
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Toolchain selection
Verify which compiler and channel Cargo is using.
bashANYrustupdefaultstable
bash
rustup default stableUseful when a machine accidentally defaults to nightly or an older channel.
bashANYcargotoolchainstable
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cargo +stable testGood for confirming whether an issue is tied to a specific channel or toolchain version.
bashANYrustupoverride
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rustup override set stableUseful when a repository should always use one toolchain regardless of the machine default.
bashANYrustupwhichrustc
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rustup which rustcHelpful when PATH confusion or editor integration points to the wrong compiler binary.
Components and targets
Install missing tools like clippy or target triples for cross builds.
bashANYrustupcomponents
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rustup component listUseful when `cargo fmt` or `cargo clippy` fails because the component is missing.
bashANYrustupcomponentclippy
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rustup component add clippyRequired before using `cargo clippy` if the component is not already installed.
bashANYrustupcomponentrustfmt
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rustup component add rustfmtRequired before using `cargo fmt` if rustfmt is missing.
bashANYrustuptargets
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rustup target list --installedUseful when cross-compilation fails because the intended target is not installed.
bashANYrustuptargetcross
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rustup target add x86_64-unknown-linux-muslA common step when building static Linux binaries or cross-compiling from another host platform.
bashANYcargobuildtarget
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cargo build --target x86_64-unknown-linux-muslUseful after adding the target with rustup and configuring any required linker or C toolchain pieces.
More in Rust CLI
Rust CLI Troubleshooting: CI, Environment, Build Scripts, and Publishing
Commands for debugging CI failures, environment mismatches, build script output, installation problems, and publish checks in Rust CLI projects.
Rust CLI Troubleshooting: Tests, Doctests, and Documentation
Commands for debugging failing tests, capturing output, isolating flaky cases, and fixing documentation-generation issues in Rust CLI projects.
Rust CLI Troubleshooting: Dependencies, Features, and Lockfiles
Commands for analyzing dependency trees, feature activation, duplicate crates, and lockfile behavior in Rust CLI projects.
Rust CLI Troubleshooting: Manifest, Packages, and Workspaces
Commands and examples for debugging Cargo.toml issues, package selection mistakes, and workspace confusion in Rust CLI repos.
Rust CLI Troubleshooting: Build Errors and Diagnostics
Commands for investigating compiler errors, Cargo diagnostics, verbose output, and fix suggestions in Rust CLI projects.
Rust CLI Cargo Config, Environment, Docs, and Debugging
Cargo configuration, environment variables, docs generation, and troubleshooting commands for Rust CLI development.