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Emit warning when trying to use PGO in conjunction with unwinding on … #61853

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Jul 10, 2019
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Emit warning when trying to use PGO in conjunction with unwinding on … #61853

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8 changes: 4 additions & 4 deletions src/librustc/session/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1303,15 +1303,15 @@ fn validate_commandline_args_with_session_available(sess: &Session) {
}

// PGO does not work reliably with panic=unwind on Windows. Let's make it
// an error to combine the two for now. It always runs into an assertions
// a warning to combine the two for now. It always runs into an assertions
// if LLVM is built with assertions, but without assertions it sometimes
// does not crash and will probably generate a corrupted binary.
if sess.opts.cg.profile_generate.enabled() &&
sess.target.target.options.is_like_msvc &&
sess.panic_strategy() == PanicStrategy::Unwind {
sess.err("Profile-guided optimization does not yet work in conjunction \
with `-Cpanic=unwind` on Windows when targeting MSVC. \
See https://github.com/rust-lang/rust/issues/61002 for details.");
sess.warn("Profile-guided optimization does not yet work in conjunction \
with `-Cpanic=unwind` on Windows when targeting MSVC. \
See https://github.com/rust-lang/rust/issues/61002 for details.");
}
}

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