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Hadrian now performs substitutions, especially to generate .cabal files
from .cabal.in files. Two benefits:
1. We won't have to re-configure when we modify thing.cabal.in. Hadrian
will take care of this for us.
2. It paves the way to allow the same package to be configured
differently by Hadrian in the same session. This will be useful to
fix #19174: we want to build a stage2 cross-compiler for the host
platform and a stage1 compiler for the cross target platform in the
same Hadrian session.
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Previously `timedWaitCondition` assumed that timeouts were referenced
against `CLOCK_MONOTONIC`. This is wrong; by default
`pthread_cond_timedwait` references against `CLOCK_REALTIME`, although
this can be overridden using `pthread_condattr_setclock`.
Fix this and add support for using `CLOCK_MONOTONIC` whenever possible
as it is more robust against system time changes and is likely cheaper
to query. Unfortunately, this is complicated by the fact that older
versions of Darwin did not provide `clock_gettime`, which means we also
need to introduce a fallback path using `gettimeofday`.
Fixes #20144.
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NetBSD supports pthread_setname_np() but it expects a printf-style format string and a string argument.
Also use pthread for itimer on this platform.
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