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Rollup merge of #84365 - vext01:improve-lto-docstrings, r=petrochenkov

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Improve the docstrings of the `Lto` struct.

This change is the result of [this zulip discussion](https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Making.20sense.20of.20LTO.20modes.20in.20rustc).

Hopefully it makes things a little clearer. What do you think?
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Mara Bos 2021-04-21 23:06:17 +02:00 • committed by GitHub
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12
compiler/rustc_session/src/config.rs
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@ -75,19 +75,21 @@ impl_stable_hash_via_hash!(OptLevel);
/// This is what the `LtoCli` values get mapped to after resolving defaults and
/// and taking other command line options into account.
///
/// Note that linker plugin-based LTO is a different mechanism entirely.
#[derive(Clone, PartialEq)]
pub enum Lto {
/// Don't do any LTO whatsoever
/// Don't do any LTO whatsoever.
No,
/// Do a full crate graph LTO with ThinLTO
/// Do a full-crate-graph (inter-crate) LTO with ThinLTO.
Thin,
/// Do a local graph LTO with ThinLTO (only relevant for multiple codegen
/// units).
/// Do a local ThinLTO (intra-crate, over the CodeGen Units of the local crate only). This is
/// only relevant if multiple CGUs are used.
ThinLocal,
/// Do a full crate graph LTO with "fat" LTO
/// Do a full-crate-graph (inter-crate) LTO with "fat" LTO.
Fat,
}