[GHC] #7152: Add flag to configure that skips overwriting of symlinks on install

[GHC]

#7152: Add flag to configure that skips overwriting of symlinks on install
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        Reporter:  tibbe             |                   Owner:
                                     |  thoughtpolice
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.4.2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by thomie):

 See also this thread: https://mail.haskell.org/pipermail/glasgow-haskell-
 users/2015-July/026020.html "simultaneous ghc versions", which
 [http://www.haskell.org/pipermail/glasgow-haskell-users/ concluded] with:


 > > > Come to think of it, shouldn't ghc include this, instead of
 > > > everyone creating their own shell scripts by hand?
 > > I don't think so. This is usually done in the userland -- at least in
 > > GNU+Linux distributions.
 > More to the point, various distribution methods already include such
 things
 > (e.g. NixOS, Debian's alternatives system, MacPorts' "port select") plus
 > there are various mechanisms for implementing this on an ad-hoc basis
 (GNU
 > stow, environment modules, etc.). Downstream packages implementing their
 > own versions of this except speicifically on an opt-in basis (e.g.
 > configure option) tend to interfere with these and complicate inclusion
 > into existing package systems.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7152#comment:9>
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