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Allow setting CFG_DISABLE_UNSTABLE_FEATURES to 0

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Two locations check whether this build-time environment variable is
defined. Allowing it to be explicitly disabled with a "0" value is
useful, especially for integrating with external build systems.
This commit is contained in:
Collin Baker 2023-01-12 05:36:04 -05:00
parent 4887cb18dc
commit 0a03d1c9ca
2 changed files with 4 additions and 2 deletions
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3
compiler/rustc_feature/src/lib.rs
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@ -83,7 +83,8 @@ impl UnstableFeatures {
/// Otherwise, only `RUSTC_BOOTSTRAP=1` will work.
pub fn from_environment(krate: Option<&str>) -> Self {
// `true` if this is a feature-staged build, i.e., on the beta or stable channel.
let disable_unstable_features = option_env!("CFG_DISABLE_UNSTABLE_FEATURES").is_some();
let disable_unstable_features =
option_env!("CFG_DISABLE_UNSTABLE_FEATURES").map(|s| s != "0").unwrap_or(false);
// Returns whether `krate` should be counted as unstable
let is_unstable_crate = |var: &str| {
krate.map_or(false, |name| var.split(',').any(|new_krate| new_krate == name))