Scripts taken from autoconf 90b8cb42ba3b244250a6986b8b78c80f30ed197a

Previously we would append -Werror to the argument list. However, this
ended up overriding the -Wno-error=... flags in Settings.Warnings.

The previous state was quite illegible.

This interfered with the autoconf variable of the same name, breaking
pre-release builds.

(cherry picked from commit 15dca847)
(cherry picked from commit 3e55edd9)

Shayne Fletcher authored 4 years ago and Ben Gamari committed 4 years ago

(cherry picked from commit 57f3fdb1)

Fixes #18233.

Takenobu Tani authored 4 years ago and Ben Gamari committed 4 years ago

This patch adds the upper bound of a happy version for ghc-9.0
and earlier.

Currently, we can't use happy-1.20.0 for ghc-9.0.

See #18620.

(cherry picked from commit 74a7fbff)

Previously we would push large objects and compact regions to the mark
queue during the deadlock detect GC, resulting in failure to detect
deadlocks.

Pull the cold non-moving allocation path out of alloc_for_copy.

Previously the deadlock-detection promotion logic in alloc_for_copy was
just plain wrong: it failed to fire when gct->evac_gen_no !=
oldest_gen->gen_no. The fix is simple: move the

When performing a deadlock-detection GC we must ensure that all objects
end up in the non-moving generation. Assert this in scavenge.

Previously an incorrect semicolon meant that we would fail to call
busy_wait_nop when spinning.

Per request of @phadej.

Pulled out of !4310.

(cherry picked from commit be408b86)

As noted in #18991, we would previously allocate heap in low memory.
Due to this the linker, which typically *needs* low memory, would end up
competing with the heap. In longer builds we end up running out of
low memory entirely, leading to linking failures.

(cherry picked from commit a1a75aa9)

We place symbol_extras right after bss. We also need
to ensure that symbol_extras can be mprotect'd independently from the
rest of the image. To ensure this we round up the size of bss to a page
boundary, thus ensuring that symbol_extras is also page-aligned.

(cherry picked from commit 9f40cf6c)
(cherry picked from commit 4b83b6a8)

See Note [Non-moving GC: Marking evacuated objects].

(cherry picked from commit b416189e)

(cherry picked from commit a3b8375e)

The mark thread is not joinable as we detach from it on creation.

(cherry picked from commit ca1ef0e7)

pthread_join returns its error code and apparently doesn't set errno.

(cherry picked from commit c488ac73)

Ensure that the the free variables have been pushed to the update
remembered set before we zero the slop.

(cherry picked from commit 134f7599)

(cherry picked from commit 35c22991)

After a THROWTO message has been handle the message closure is
overwritten by a NULL message. We must ensure that the original
closure's pointers continue to be visible to the nonmoving GC.

(cherry picked from commit 6c2faf15)

The TSAN rework (specifically aad1f803) introduced a subtle regression
in GC.c, swapping `g0` in place of `gen`. Whoops!

Fixes #18997.

(cherry picked from commit 21c807df)

See Note [Racing weak pointer evacuation] for all of the gory details.

When fixing #17962 I neglected to consider that --export-dynamic is only
supported on ELF platforms.

(cherry picked from commit 35799dda)

Fix the previous backport; this function was dead code in master but is
still needed due to ProfHeap.c in ghc-8.10.

Since the latter wants to call getRTSStats.

While on face value this seems a bit heavy, I think it's far better than
enforcing ordering on every access.

We can generally be pretty relaxed in the barriers here since the timer
thread is a loop.

Previously `initScheduler` would attempt to pause the ticker and in so
doing acquire the ticker mutex. However, initTicker, which is
responsible for initializing said mutex, hadn't been called
yet.

This avoids #17289.