[musl] add posix_spawn chdir functions #3949
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Add `posix_spawn_file_actions_add[f]chdir_np`, as present in musl 1.1.24 and above ([reference]). [reference]: https://git.musl-libc.org/cgit/musl/commit/?id=74244e5b3ed4a61d99c5fc0967b69e5c9a753456
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Add `posix_spawn_file_actions_add[f]chdir_np`, as present in musl 1.1.24 and above ([reference]). [reference]: https://git.musl-libc.org/cgit/musl/commit/?id=74244e5b3ed4a61d99c5fc0967b69e5c9a753456 (backport <rust-lang#3949>) (cherry picked from commit b68a159)
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Currently, not all libcs have the `posix_spawn_file_actions_addchdir_np` symbol available to them. So we attempt to do a weak symbol lookup for that function. But that only works if libc is a dynamic library -- with statically linked musl binaries the symbol lookup would never work, so we would never be able to use it even if the musl in use supported the symbol. Now that Rust has a minimum musl version of 1.2.3, all supported musl versions now include this symbol, so we can unconditionally expect it to be there. This symbol was added to libc in rust-lang/libc#3949 -- use it here. I couldn't find any tests for whether the posix_spawn path is used, but I've verified with cargo-nextest that this change works. This is a substantial improvement to nextest's performance with musl. On my workstation with a Ryzen 7950x, against https://github.com/clap-rs/clap at 61f5ee514f8f60ed8f04c6494bdf36c19e7a8126: Before: ``` Summary [ 1.071s] 879 tests run: 879 passed, 0 skipped ``` After: ``` Summary [ 0.392s] 879 tests run: 879 passed, 0 skipped ``` Fixes rust-lang#99740.
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Currently, not all libcs have the `posix_spawn_file_actions_addchdir_np` symbol available to them. So we attempt to do a weak symbol lookup for that function. But that only works if libc is a dynamic library -- with statically linked musl binaries the symbol lookup would never work, so we would never be able to use it even if the musl in use supported the symbol. Now that Rust has a minimum musl version of 1.2.3, all supported musl versions now include this symbol, so we can unconditionally expect it to be there. This symbol was added to libc in rust-lang/libc#3949 -- use it here. I couldn't find any tests for whether the posix_spawn path is used, but I've verified with cargo-nextest that this change works. This is a substantial improvement to nextest's performance with musl. On my workstation with a Ryzen 7950x, against https://github.com/clap-rs/clap at 61f5ee514f8f60ed8f04c6494bdf36c19e7a8126: Before: ``` Summary [ 1.071s] 879 tests run: 879 passed, 0 skipped ``` After: ``` Summary [ 0.392s] 879 tests run: 879 passed, 0 skipped ``` Fixes rust-lang#99740.
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Currently, not all libcs have the `posix_spawn_file_actions_addchdir_np` symbol available to them. So we attempt to do a weak symbol lookup for that function. But that only works if libc is a dynamic library -- with statically linked musl binaries the symbol lookup would never work, so we would never be able to use it even if the musl in use supported the symbol. Now that Rust has a minimum musl version of 1.2.3, all supported musl versions now include this symbol, so we can unconditionally expect it to be there. This symbol was added to libc in rust-lang/libc#3949 -- use it here. I couldn't find any tests for whether the posix_spawn path is used, but I've verified with cargo-nextest that this change works. This is a substantial improvement to nextest's performance with musl. On my workstation with a Ryzen 7950x, against https://github.com/clap-rs/clap at 61f5ee514f8f60ed8f04c6494bdf36c19e7a8126: Before: ``` Summary [ 1.071s] 879 tests run: 879 passed, 0 skipped ``` After: ``` Summary [ 0.392s] 879 tests run: 879 passed, 0 skipped ``` Fixes rust-lang#99740.
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Currently, not all libcs have the `posix_spawn_file_actions_addchdir_np` symbol available to them. So we attempt to do a weak symbol lookup for that function. But that only works if libc is a dynamic library -- with statically linked musl binaries the symbol lookup would never work, so we would never be able to use it even if the musl in use supported the symbol. Now that Rust has a minimum musl version of 1.2.3, all supported musl versions now include this symbol, so we can unconditionally expect it to be there. This symbol was added to libc in rust-lang/libc#3949 -- use it here. I couldn't find any tests for whether the posix_spawn path is used, but I've verified with cargo-nextest that this change works. This is a substantial improvement to nextest's performance with musl. On my workstation with a Ryzen 7950x, against https://github.com/clap-rs/clap at 61f5ee514f8f60ed8f04c6494bdf36c19e7a8126: Before: ``` Summary [ 1.071s] 879 tests run: 879 passed, 0 skipped ``` After: ``` Summary [ 0.392s] 879 tests run: 879 passed, 0 skipped ``` Fixes rust-lang#99740.
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Oct 19, 2024
[musl] use posix_spawn if a directory change was requested Currently, not all libcs have the `posix_spawn_file_actions_addchdir_np` symbol available to them. So we attempt to do a weak symbol lookup for that function. But that only works if libc is a dynamic library -- with statically linked musl binaries the symbol lookup would never work, so we would never be able to use it even if the musl in use supported the symbol. Now that Rust has a minimum musl version of 1.2.3, all supported musl versions now include this symbol, so we can unconditionally expect it to be there. This symbol was added to libc in rust-lang/libc#3949 -- use it here. I couldn't find any tests for whether the posix_spawn path is used, but I've verified with cargo-nextest that this change works. This is a substantial improvement to nextest's performance with musl. On my workstation with a Ryzen 7950x, against https://github.com/clap-rs/clap at 61f5ee514f8f60ed8f04c6494bdf36c19e7a8126: Before: ``` Summary [ 1.071s] 879 tests run: 879 passed, 0 skipped ``` After: ``` Summary [ 0.392s] 879 tests run: 879 passed, 0 skipped ``` Fixes rust-lang#99740. try-job: dist-various-1 try-job: dist-various-2
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Add
posix_spawn_file_actions_add[f]chdir_np, as present in musl 1.1.24 and above (reference).