amd64 and -fPIC

[Kris Kennaway]

On Mon, Feb 20, 2006 at 05:18:15AM +0100, pfgshield-freebsd at yahoo.com wrote:
> Hi;
> 
> amd64 has a rather nasty issue: in order to mix shared and static libraries
> everything has to be built with -fPIC. Most ports are either static or dynamic
> so it's usually not a problem, but I'm stating to find problems in the math
> section: packages like arpack and glpk are only built static and without -fPIC.
> And lately we are only building the dynamic version of ATLAS so packages that
> use many math libraries will have problems on amd64.
> 
> Someone would say the easy way out of this would be to add -fPIC to everything
> by default, which works, but has some performance issues. If someone has a
> better solution I would like to hear it (please!) but if not I would like to
> suggest instead a general guideline:
> 
> If the package includes a library that might be used frequently and doesn't
> include a shared version please add -fPIC to the amd64 version of the port, for
> example for math/arpack (and feel free to commit this):

The best solution is to make the port also build a shared version;
it's usually not that difficult to modify the makefile.  That way you
don't have to add nasty hacks.

Kris
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