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Ensure libraries built in stage0 have unique metadata

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Issue #50786 shows a case with local rebuild where the libraries built
by stage0 had the same suffix as stage0's own, and were accidentally
loaded by that stage0 rustc when compiling `librustc_trans`.

Now we set `__CARGO_DEFAULT_LIB_METADATA` to "bootstrap" during stage0,
rather than the release channel like usual, so the library suffix will
always be completely distinct from the stage0 compiler.
This commit is contained in:
Josh Stone 2018-05-15 17:48:02 -07:00
parent f0fdaba04e
commit e8e5eb58c0
1 changed files with 9 additions and 1 deletions
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10
src/bootstrap/builder.rs
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@ -592,7 +592,15 @@ impl<'a> Builder<'a> {
// FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
// Force cargo to output binaries with disambiguating hashes in the name
cargo.env("__CARGO_DEFAULT_LIB_METADATA", &self.config.channel);
let metadata = if compiler.stage == 0 {
// Treat stage0 like special channel, whether it's a normal prior-
// release rustc or a local rebuild with the same version, so we
// never mix these libraries by accident.
"bootstrap"
} else {
&self.config.channel
};
cargo.env("__CARGO_DEFAULT_LIB_METADATA", &metadata);
let stage;
if compiler.stage == 0 && self.local_rebuild {