Global register variables on Sparc

[Sven Panne]

Using GHC 5.00.2 on Sparc (Solaris 2.7) yields

   warning: call-clobbered register used for global register variable

when -Wall is given (for registers F1, F2, F3, F4, D1, and D2).
Nevertheless, things seem to work fine. Is this only an artifact of
-Wall or something more serious?

Cheers,
   S.
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