[beta] Fix LTO with doctests. #8658
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… r=alexcrichton Fix cache_messages::rustdoc test broken on beta. The most recent beta `rustc 1.47.0-beta.1` broke this test (rust-lang/rust#75951). Just switch to a different lint to get the test working again.
Add spaces after -C and -Z flags for consistency Most other options have a space after flag name. This commit makes verbose output of rustc invocations a little bit cleaner.
Fix LTO with doctests. This fixes an issue where `cargo test --release` would fail to run doctests if LTO is set in `profile.release` or `profile.bench`. The issue is that dependencies were built with `-Clinker-plugin-lto`, but the final rustdoc invocation did not issue `-C lto`. This causes a link failure (or crash!) because the necessary object code was missing. This is because rustdoc historically did not support codegen flags, so Cargo has never passed them in. Rustdoc now supports codegen flags (via rust-lang/rust#63827), so it should be safe to start passing them in. For now, I am only adding LTO, but more should be added in the future. There are two bugs here. One is that LTO flags aren't passed to rustdoc. The other is that the "doctest" unit was using the wrong profile (it was using dev/release when it should be using test/bench). There are two distinct scenarios here. One where just `release` has `lto` set. And one where both `release` and `bench` have `lto` set. This is relevant because LTO mostly cares about what the final artifact wants, and in the case where `bench` does not have `lto` set, then LTO will not be used for tests. This will hopefully be a little cleaner in the future when rust-lang#6988 is stabilized, which causes the test/bench profiles to *inherit* from the dev/bench profiles, which means you won't need to manually synchronize the test/bench profiles with dev/release. Fixes rust-lang#8654
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…acrum [beta] Update cargo 1 commits in 51b66125ba97d2906f461b3f4e0408f206299bb6..f3c7e066ad66e05439cf8eab165a2de580b41aaf 2020-08-19 20:22:52 +0000 to 2020-08-28 19:37:58 +0000 - [beta] Fix LTO with doctests. (rust-lang/cargo#8658)
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Beta packports:
Although the LTO regression is on 1.46, I probably won't do a stable backport even if there is a point release, as I think it would be good to have sufficient time for testing on nightly, and I don't want to rush it. I'm willing to reconsider that, though.