Auto merge of #49530 - petrhosek:empty-extra-flags, r=cramertj
Only include space in RUSTFLAGS extra flags if not empty 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.
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@ -555,7 +555,9 @@ impl<'a> Builder<'a> {
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let mut extra_args = env::var(&format!("RUSTFLAGS_STAGE_{}", stage)).unwrap_or_default();
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if stage != 0 {
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let s = env::var("RUSTFLAGS_STAGE_NOT_0").unwrap_or_default();
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extra_args.push_str(" ");
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if !extra_args.is_empty() {
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extra_args.push_str(" ");
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}
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extra_args.push_str(&s);
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}
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