6.4.2 release plans
duncan.coutts at worc.ox.ac.uk
Mon Mar 20 14:46:48 EST 2006
On Thu, 2006-03-16 at 17:19 +0000, Duncan Coutts wrote:
> > > We have some arch-specific defaults for wether to enable certain ghc
> > > features. I think these would be suitable defaults for everyone:
> > >
> > > alpha, hppa and ppc64 should use GhcWithInterpreter=NO
> > This corresponds to the current default except for ppc64. Does GHCi not
> > work on ppc64? (I don't see any ppc64-specific stuff in rts/Linker.c,
> > so maybe).
> I can double check. The ppc64 ABI is somewhat different to that of ppc.
We tested this again and ghci does not work "out of the box" on ppc64
with ghc-6.4.1. We think this is related to a "TOC overflow" problem
that we get with the ppc64 ABI.
The ppc64 ABI has this limited-size TOC table for referencing global
symbols. The gnu binutils has some support for making more TOCs when
they overflow so most of the time one can ignore the TOC size
restriction. Unfortunately this doesn't seem to work when all the
little .o files in a package are linked together into one GHCi-style .o
file. Since the GHCi .o files are unusable, GHCi itself becomes
> > > alpha, hppa, ppc, ppc64 and sparc should use SplitObjs=NO
> > This corresponds to the current default except for sparc and powerpc.
> > What's the problem with those?
> At one time they did not work. I'll double check.
You're quite right, we tested this again and SplitObjs=YES does indeed
work on sparc and ppc.
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