On Sun, Sep 18, 2005 at 05:28:44PM +0200, Loïc Minier wrote: > Hi, > > Policy 10.2: "The shared version of a library must be compiled with > -fPIC". > > This is a "must", but I couldn't find where the requirement comes from > (I only checked the changelog). > > I'm currently trying to resolve Debian bug #268603 where mpeg2dec is > built with -fPIC on i386 only. As far as I understood it, -fPIC is a > 10% performance improvement on i386 only, and a much smaller > improvement on most other arches because they usually have more > registers. I also have read that -fPIC is borken on some !i386 arches.
I guess you mean not using -fPIC is a performance improvement, and ffmpeg is only not using it on i386. > Would someone please sched some light on the origins of this > requirement? If this requirement is only to save memory in most cases, > would it be reasonable to permit building with -fPIC by changing this > "must" in a "should"? The problem is that on some architectures not using -fPIC will just not work (hppa, amd64, alpha) while on others it's the default (atleast ia64). I don't now about other arches. As I understand it, i386 really is the only arch that supports non-pic code in a shared object. There are also ways to avoid the relocations, and I really recommend everybody making a shared library reads Ulrich Drepper's dso howto: http://people.redhat.com/drepper/dsohowto.pdf Kurt -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
