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Unrolled build for rust-lang#120475
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Rollup merge of rust-lang#120475 - Nilstrieb:cargo-build-my-a-, r=michaelwoerister

Improve error message when `cargo build` is used to build the compiler

Inspired by rust-lang#76446.

Doing it for `core` is probably higher value but also way harder because tools like cargo or rustc-build-sysroot would need to be fixed first, which I don't feel like doing.
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rust-timer authored Jan 30, 2024
2 parents 5ad7454 + 6468d44 commit 6439fe8
Showing 1 changed file with 16 additions and 0 deletions.
16 changes: 16 additions & 0 deletions compiler/rustc_macros/build.rs
Original file line number Diff line number Diff line change
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fn main() {
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-env-changed=RUSTC_BOOTSTRAP");
if !std::env::var("RUSTC_BOOTSTRAP").is_ok() {
eprintln!(
"error: you are attempting to build the compiler without going through bootstrap"
);
eprintln!(
"help: see https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html for how to build the compiler"
);
eprintln!(
"help: if you know what you're doing, set the RUSTC_BOOTSTRAP environment variable to any value"
);
panic!("wrong command used for building");
}
}

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