Hi,

I'm seeing three build failures in CI:

1. On perf-nofib, it fails with:

== make boot -j --jobserver-fds=3,4 --no-print-directory;
  in /builds/cactus/ghc/nofib/real/smallpt
------------------------------------------------------------------------
/builds/cactus/ghc/ghc/bin/ghc  -M -dep-suffix "" -dep-makefile .depend
-osuf o     -O2 -Wno-tabs -Rghc-timing -H32m -hisuf hi -packageunboxed-ref
-rtsopts smallpt.hs
<command line>: cannot satisfy -package unboxed-ref
     (use -v for more information)

(e.g. https://gitlab.haskell.org/cactus/ghc/-/jobs/743141#L1465)

2. On validate-x86_64-darwin, pretty much every test fails because of the
following extra stderr output:

+
+<no location info>:
+    warning: Couldn't figure out C compiler information!
+             Make sure you're using GNU gcc, or clang

(e.g. https://gitlab.haskell.org/cactus/ghc/-/jobs/743129#L3655)

3. On validate-x86_64-linux-deb9-integer-simple, T11545 fails on memory
consumption:

Unexpected stat failures:
    perf/compiler/T11545.run  T11545 [stat decreased from x86_64-linux-deb9-integer-simple-validate baseline @
5f3991c7cab8ccc9ab8daeebbfce57afbd9acc33] (normal)

This one is interesting because there is already a commit that is supposed
to fix this:

commit efaad7add092c88eab46e00a9f349d4675bbee06
Author: Matthew Pickering <matthewtpickering@gmail.com>
Date:   Wed Jul 21 10:03:42 2021 +0100

     Stop ug_boring_info retaining a chain of old CoreExpr

     [...]

     -------------------------
     Metric Decrease:
         T11545
     -------------------------

But still, it's failing.

Can someone kick these build setups please?

--

   .--= ULLA! =-----------------.
    \     http://gergo.erdi.hu   \
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