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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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