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Replace RUST_LIBC_UNSTABLE env with libc_unstable* cfg#4977

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tgross35 wants to merge 2 commits intorust-lang:mainfrom
tgross35:libc-cfg
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Replace RUST_LIBC_UNSTABLE env with libc_unstable* cfg#4977
tgross35 wants to merge 2 commits intorust-lang:mainfrom
tgross35:libc-cfg

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Make it easier to set these flags only for specific targets, and not necessarily on the host. This was discussed on Zulip.

The internal config `linux_time_bits64` already gets set via the musl or
glibc config, so it isn't useful to be able to set it on its own. Delete
the env option since it isn't used anyway.
@rustbot rustbot added the A-CI Area: CI-related items label Feb 14, 2026
@tgross35 tgross35 force-pushed the libc-cfg branch 2 times, most recently from adfca8d to 3d160eb Compare February 14, 2026 22:25
Make it easier to set these flags only for host or target, not both.
This was discussed on Zulip.
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