aio functions do not require librt on FreeBSD #2018
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On FreeBSD, the aio_ functions require librt _only_ if they use SIGEV_THREAD completion notification. However, due to Rust's originally poor support for C unions, libc doesn't even expose some of the fields of struct sigevent that SIGEV_THREAD requires. Accordingly, there is no need to link librt to programs using aio via libc. This change partially reverts 8c23f77 from PR rust-lang#1630 . While I'm here, fix the linkage of lio_listio on DragonflyBSD. It _does_ require librt.
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r? @JohnTitor (rust-highfive has picked a reviewer for you, use r? to override) |
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cc @myfreeweb |
JohnTitor
approved these changes
Jan 5, 2021
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@bors r+ |
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📌 Commit f40f306 has been approved by |
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☀️ Test successful - checks-actions, checks-cirrus-freebsd-11, checks-cirrus-freebsd-12, checks-cirrus-freebsd-13 |
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Thanks John! |
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On FreeBSD, the aio_ functions require librt only if they use
SIGEV_THREAD completion notification. However, due to Rust's originally
poor support for C unions, libc doesn't even expose some of the fields of
struct sigevent that SIGEV_THREAD requires. Accordingly, there is no
need to link librt to programs using aio via libc.
This change partially reverts 8c23f77
from PR #1630 .
While I'm here, fix the linkage of lio_listio on DragonflyBSD. It
does require librt.