Date: Tue, 7 Mar 2006 19:37:56 +0100 From: Roman Neuhauser <neuhauser@sigpipe.cz> To: Kris Kennaway <kris@obsecurity.org> Cc: pfgshield-freebsd@yahoo.com, freebsd-ports@FreeBSD.org Subject: Re: amd64 and -fPIC Message-ID: <20060307183756.GD73973@isis.sigpipe.cz> In-Reply-To: <20060220043813.GA82552@xor.obsecurity.org> References: <20060220041815.3229.qmail@web32907.mail.mud.yahoo.com> <20060220043813.GA82552@xor.obsecurity.org>
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# kris@obsecurity.org / 2006-02-19 23:38:13 -0500:
> On Mon, Feb 20, 2006 at 05:18:15AM +0100, pfgshield-freebsd@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.
That doesn't solve the problem, which is: the static library is
almost useless, and users might actually want or need to use the
static library.
net/libpcap only installs lib/libpcap.so if you install into /usr,
probably because all the dependent ports would need to be taught
to look in /usr/local/lib first.
misc/ossp-uuid's ${PREFIX}/lib/libuuid.a (it configures with
--disable-shared) cannot be used in shared libraries on amd64
because the port doesn't use -fPIC on this platform.
Ports that install static libraries *need* to use -fPIC on amd64.
--
How many Vietnam vets does it take to screw in a light bulb?
You don't know, man. You don't KNOW.
Cause you weren't THERE. http://bash.org/?255991
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