On Tue, 2003-11-11 at 14:36, Kevin B.Hendricks wrote: > I got got a dual Operton system that is similar in many ways to the > PPC64 versus 32 issue in that 32 bit apps run at full speed under > Opteron.
Me too. > Using that as an example: > > - kernel is 64 bit supporting both 32 but and 64 bit syscalls > - /lib and /lib64 both exist Now try compiling the XFS RPMs natively. It requires quite a bit of hacking, because of that damn broken /lib64 invention. We use to use /usr/lib/i386-unknown-aout for our old a.out executables. Follow that example. So for PowerPC: 64-bit in /lib and /usr/lib 32-bit in /usr/lib/elf32-powerpc > - tool chain defaults to 64 bit but with addition of -m32 wll generate > 32 bit > - gdb32 and gdb available > - almost all packages are compiled 64 bit src rpms, with just a few key > libraries done in 32 bit > > This system works quite well as a research box, able to compile and run > 32 bit apps like SAS, but also able to compile and use R and my own > code using -m64 that allow its numberical processing power to shine. At least for me (Red Hat Enterprise 3) the -m64 is not needed. The compiler defaults to 64-bit.
