Re: [R] RMySQL not loading on Mac OS X

From: Bill Northcott <w.northcott_at_unsw.edu.au>
Date: Thu 18 Aug 2005 - 20:47:50 EST

On 18/08/2005, at 7:46 PM, Georg Otto wrote:
> Concerning your suggestion: The system default compiler is gcc 4.0,
> but RMySQL seems to be built using gcc-3.3 regardless if I switch
> to 3.3. or not.
>
> Would it be a solution to force RMySQL to use gcc 4.0 during built?
> (Might be a naive idea, I am quite new to this). And if yes, how
> could I do this?

When R is built it stores the configuration including the compilers which were used. When you try to build a source package, it uses the same compile commands. However, this is a less than perfect mechanism and requires that the packagers of binaries understand what is going on.

For instance on Panther 'gcc' by default means gcc-3.3, whereas on Tiger by default it means gcc-4.0. So a package built with 'gcc' and 'g77' will work on Panther but not Tiger. See the problem.

OTOH 'gcc-3.3' means gcc-3.3 on either Panther or Tiger, but 'gcc-4.0' won't work on Panther at all.

The best solution is to build everything from source with the same compilers. That way you cannot have a compatibility problems.

Hopefully soon the transition to gcc-4 will be complete. The change to Intel guarantees that, because the Apple gcc-3.3 compilers don't do x86 code. In a perfect future Apple will include Fortran in their Developer tools distribution, but for now they want gcc-4 and gfortran is not quite ready for the big time.

Bill Northcott



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