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Improve error message when cargo build is used to build the compiler #120475

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merged 1 commit into from
Jan 30, 2024
Merged

Improve error message when cargo build is used to build the compiler #120475

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16 changes: 16 additions & 0 deletions compiler/rustc_macros/build.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
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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