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Co-authored-by: Rémy Rakic <remy.rakic+github@gmail.com>
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Before, it said "global_allocator does nothing". Now it gives you
suggestions for what to do if you want to change the global allocator
(which is likely the main reason you'd be reading the comment).
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This is the first (known) step towards starting to use `unix_sigpipe` in
the wild. Eventually, `rustc_driver::set_sigpipe_handler` can be removed
and all clients can use `unix_sigpipe` instead.
For now we just start using `unix_sigpipe` in once place: `rustc`
itself.
It is easy to manually verify this change. If you remove
`#[unix_sigpipe = "sig_dfl"]` and run `./x.py build` you will get an ICE
when you do `./build/x86_64-unknown-linux-gnu/stage1/bin/rustc --help |
false`. Add back `#[unix_sigpipe = "sig_dfl"]` and the ICE disappears
again.
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This was added in #83152, which has several errors in its comments.
This commit also fix up the comments, which are quite wrong and
misleading.
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Fix jemalloc usage on OSX
Closes #82423
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we need to actually -> we actually need to
@rustbot label +C-cleanup
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Closes #82423
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