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Only include space in RUSTFLAGS extra flags if not empty

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When the RUSTFLAGS_STAGE_{1,2} is not set, including a space means
the string will always be non-empty and RUSTFLAGS will be always be
reset which breaks other ways of setting these such as through config
in CARGO_HOME.
This commit is contained in:
Petr Hosek 2018-03-30 19:37:08 -07:00
parent 80785a547d
commit c6bae16dc2
1 changed files with 3 additions and 1 deletions
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4
src/bootstrap/builder.rs
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@ -555,7 +555,9 @@ impl<'a> Builder<'a> {
let mut extra_args = env::var(&format!("RUSTFLAGS_STAGE_{}", stage)).unwrap_or_default();
if stage != 0 {
let s = env::var("RUSTFLAGS_STAGE_NOT_0").unwrap_or_default();
extra_args.push_str(" ");
if !extra_args.is_empty() {
extra_args.push_str(" ");
}
extra_args.push_str(&s);
}