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Set LIBC_CHECK_CFG=1 when building Rust code in bootstrap #108898

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Mar 9, 2023
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Set LIBC_CHECK_CFG=1 when building Rust code in bootstrap #108898

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9 changes: 9 additions & 0 deletions src/bootstrap/builder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1718,6 +1718,15 @@ impl<'a> Builder<'a> {

cargo.env("RUSTC_VERBOSE", self.verbosity.to_string());

// Downstream forks of the Rust compiler might want to use a custom libc to add support for
// targets that are not yet available upstream. Adding a patch to replace libc with a
// custom one would cause compilation errors though, because Cargo would interpret the
// custom libc as part of the workspace, and apply the check-cfg lints on it.
//
// The libc build script emits check-cfg flags only when this environment variable is set,
// so this line allows the use of custom libcs.
cargo.env("LIBC_CHECK_CFG", "1");

if source_type == SourceType::InTree {
let mut lint_flags = Vec::new();
// When extending this list, add the new lints to the RUSTFLAGS of the
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