[Groff] Fw: configure checking for csh hash hack

[Werner LEMBERG]

I got this from Arne.


     Werner

--- Begin Message --- Subject: Re: configure checking for csh hash hack Date: Fri, 16 Dec 2016 17:20:24 +0100 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

Hi Werner,

I tested your csh hack fix from

    https://lists.gnu.org/archive/html/bug-groff/2015-05/msg00017.html

But it does not work on my Gentoo system.

It seems the blockage is connected to a bug in tcsh when used with GCC 5
(GCC 5 optimizes away a required check because a variable which must not
be optimized away is not marked as volatile):

    https://bugs.archlinux.org/task/45602
    http://mx.gw.com/pipermail/tcsh-bugs/2015-May/000944.html

So the solution is to update to tcsh 6.20 (or rather require either tcsh
>= 6.20 or no csh at all) which fixes the issue.

In short: Nothing to be done in groff. The bug is between tcsh and gcc5
and already fixed in tcsh 6.20.00

Best wishes,
Arne
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Karlsruher Institut für Technologie (KIT)
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