Re: [libdv-dev] Re: libdv for AMD64

[Dean K. <kol...@qw...>]

I changed to ld 2.15.92.0.2, which is in Fedora Core 3, and reproduced the 
problem.

As I understand it, x86-64 shared libraries cannot use absolute addresses 
in the instructions, because the library may be shared between multiple 
executables. Also, most rip-relative instructions can only use a 32-bit 
offset. Therefore in x86-64 shared libraries, when accessing an address in 
another .o, you have to go through the Global Offset Table. The computed 
address has to be 64 bits, a 32 bit offset doesn't work between shared .o 
files. The new linker is enforcing this. For libdv, the error messages are 
correct. Within a .o, smaller than 2 GB, rip-relative addresses can be used 
without going through the GOT.

I found a new version of the ABI at 
http://ftp.lug.ro/suse/people/matz/ABI/abi-095.pdf with an expanded section 
3.5 with position independent code examples.

I made some fixes to use the GOT and put them at 
http://www.users.qwest.net/~kdean6/libdv_fixes.tar.bz2 Extract the files 
into the libdv subdirectory and rebuild.