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| -rw-r--r-- | src/bootstrap/builder.rs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/bootstrap/builder.rs b/src/bootstrap/builder.rs index 9b5e116aa5c..47d742ef796 100644 --- a/src/bootstrap/builder.rs +++ b/src/bootstrap/builder.rs @@ -1721,6 +1721,15 @@ 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 |