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

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

Inspired by #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.
This commit is contained in:
Guillaume Gomez 2024-01-30 16:57:50 +01:00 committed by GitHub
commit 399b81faac
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1 changed files with 16 additions and 0 deletions
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compiler/rustc_macros/build.rs Normal file
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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");
}
}