bjoernager/rust
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Add support for nounused --extern flag

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This adds `nounused` to the set of extern flags:
`--extern nounused:core=/path/to/core/libcore.rlib`.

The effect of this flag is to suppress `unused-crate-dependencies`
warnings relating to the crate.
This commit is contained in:
Jeremy Fitzhardinge 2022-04-14 15:09:00 -07:00 • committed by Jeremy Fitzhardinge
parent b21759f550
commit 9102edf208
6 changed files with 38 additions and 1 deletions
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11
compiler/rustc_session/src/config.rs
View file

@ -474,6 +474,11 @@ pub struct ExternEntry {
/// This can be disabled with the `noprelude` option like
/// `--extern noprelude:name`.
pub add_prelude: bool,
/// The extern entry shouldn't be considered for unused dependency warnings.
///
/// `--extern nounused:std=/path/to/lib/libstd.rlib`. This is used to
/// suppress `unused-crate-dependencies` warnings.
pub nounused_dep: bool,
}
#[derive(Clone, Debug)]
@ -512,7 +517,7 @@ impl Externs {
impl ExternEntry {
fn new(location: ExternLocation) -> ExternEntry {
ExternEntry { location, is_private_dep: false, add_prelude: false }
ExternEntry { location, is_private_dep: false, add_prelude: false, nounused_dep: false }
}
pub fn files(&self) -> Option<impl Iterator<Item = &CanonicalizedPath>> {
@ -2131,6 +2136,7 @@ pub fn parse_externs(
let mut is_private_dep = false;
let mut add_prelude = true;
let mut nounused_dep = false;
if let Some(opts) = options {
if !is_unstable_enabled {
early_error(
@ -2152,6 +2158,7 @@ pub fn parse_externs(
);
}
}
"nounused" => nounused_dep = true,
_ => early_error(error_format, &format!("unknown --extern option `{opt}`")),
}
}
@ -2160,6 +2167,8 @@ pub fn parse_externs(
// Crates start out being not private, and go to being private `priv`
// is specified.
entry.is_private_dep |= is_private_dep;
// likewise `nounused`
entry.nounused_dep |= nounused_dep;
// If any flag is missing `noprelude`, then add to the prelude.
entry.add_prelude |= add_prelude;
}