Auto merge of #100786 - sunshowers:macos-posix-chdir, r=sunshowers

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Use posix_spawn for absolute paths on macOS

Currently, on macOS, Rust never uses the fast posix_spawn path if a
directory change is requested, due to a bug in Apple's libc. However, the
bug is only triggered if the program is a relative path.

This PR makes it so that the fast path continues to work if the program
is an absolute path or a lone filename.

This was an alternative proposed in https://github.com/rust-lang/rust/pull/80537#issue-776674009, and it makes a measurable performance difference in some of my code that spawns thousands of processes.

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bors 2022-08-29 07:54:06 +00:00

parent 328d1a1474 c62518000d

commit db137150d7

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