[Bug 1256246] Re: gccgo/arm64: using channels before main starts is unreliable

[Michael Hudson-Doyle]

This (rather obvious) more aggressive version does hang when compiled
with mainline though.

** Attachment added: "whut6.go"
   https://bugs.launchpad.net/ubuntu/+source/gcc-4.8/+bug/1256246/+attachment/3920095/+files/whut6.go

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Title:
  gccgo/arm64: using channels before main starts is unreliable

Status in “gcc-4.8” package in Ubuntu:
  New

Bug description:
  This is the distilled version of the problem that was causing the gcc
  testsuite to hang -- compile and run the attached.  It hangs for me,
  but only on real hardware: I suspect a race that only occurs on
  multiprocessors.

  For extra fun, it _does not_ hang when compiled with mainline /
  gcc-4.9 as of a few days ago.

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