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Make globals with private linkage unnamed. Fixes #50862.
cc @oli-obk @nagisa
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This is a clippy-breaking change.
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Emitting LLVM bitcode uses ThinLTOBuffers, so we need to prepare for
thin LTO or we will likely cause errors in LLVM.
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Previously linker diagnostic were being hidden when two modules were linked
together but failed to link. This commit fixes the situation by ensuring that we
have a diagnostic handler installed and also adds support for handling linker
diagnostics.
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This reverts commit f6894ebe664d111259a91a2b5fcc1236ca413436.
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Remove `ty_to_def_id`
fixes https://github.com/rust-lang/rust/issues/52341
The uses were mostly convenience and generally "too powerful" (would also have worked for types that weren't interesting at the use site)
r? @eddyb
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r=alexcrichton
Preliminary work for incremental ThinLTO.
Since implementing incremental ThinLTO is a bit more involved than I initially thought, I'm splitting out some of the things that already work. This PR (1) adds a way accessing some ThinLTO information in `rustc` and (2) does some cleanup around CGU/object file naming (which makes things quite a bit nicer).
This is probably best reviewed one commit at a time.
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Deny bare trait objects in in src/librustc_codegen_llvm
Enforce `#![deny(bare_trait_objects)]` in `src/librustc_codegen_llvm`.
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Disable LLVM verification by default
Currently -Z no-verify only controls IR verification prior to LLVM codegen, while verification is performed unconditionally both before and after linking with (Thin)LTO.
Also wondering what the sentiment is on disabling verification by default (and e.g. only enabling it on ALT builds with assertions). This does not seem terribly useful outside of rustc development and it does seem to show up in profiles (at something like 3%).
**EDIT:** A table showing the various configurations and what is enabled when.
| Configuration | Dynamic verification performed | LLVM static assertions compiled in |
| --- | --- | --- |
| alt builds | | yes |
| nightly builds | | no |
| stable builds | | no |
| CI builds | | |
| dev builds in a checkout | | |
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instead of embedding the bitcode into the regular object file.
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This disables IR verification by default.
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Currently -Z no-verify only controls IR verification prior to
LLVM codegen, while verification is performed unconditionally
both before and after linking with (Thin)LTO.
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Codegen issues commonly only manifest under specific circumstances,
e.g. if multiple codegen units are used and ThinLTO is enabled.
However, these configuration are threaded, making the use of LLVM
debugging facilities hard, as output is interleaved.
This patch adds a -Z no-parallel-llvm flag, which allows disabling
parallelization of codegen and linking, while otherwise preserving
behavior with regard to codegen units and LTO.
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