在 2006-06-25日的 12:01 +0800，Zhang Weiwu写道： > I have been using gentoo linux on my ultra-sparc U2 and U5 for two > years, untill very recently I learnt the gentoo Linux is actually not > 64-bit (it is 32-bit). > > The U2 gets broken after I upgraded OBP (when I tries Solaris 10, it > prompted OBP is 32-bit OBP, I must upgrade to 64bit, then I did it, then > this U2 never boots up again). I have the remaining U5 box serving as > print server, it simply run out of CPU power (a single A4 brochure > printing uses up CPU and caused very slow printing). I think I can run > the machine in 64-bit mode, recompile related packages in 64-bit > executable to regain some speed. > > I tried to adjust C-flags: > > CFLAGS="-O2 -m64 -mcpu=ultrasparc -fomit-frame-pointer -pipe" > (added -m64) > > then emerge a package, get this error: > > checking whether the C compiler (gcc -O2 -m64 -mcpu=ultrasparc > -fomit-frame-pointer -pipe ) works... no > > I think perhaps it is not possible to compile anything in 64-bit > executable when the kernel itself is running in 32-bit mode. Perhaps it > is not possible to run 64-bit code on 32-bit kernal at all (if this > sounds obvious, I admit I am a newbie). So what should I do? Should I > try to compile a kernel with -m64 first? Then there comes another > question: can 32-bit OBP loads 64bit kernel? I don't know if I have 64 > OBP at all (and don't know how to tell it), my other U2 has had 32bit > OBP, that's for sure. > > and even if I try to compile a 64-bit kernel, that may as well not > possible because it seems gcc refuse to run with -m64 (the error message > above). > > Besides, is 64-big executable much faster then 32-bit executable? > > P.S. I bet there must be an article somewhere on the Internet telling > how to get 64-bit linux running on sparcs, only that I didn't find it. >
an example of trying to run gcc with -m64 on 32bit system: sappho ~ # touch abc #creates 0byte file abc sappho ~ # gcc -O2 -m64 -mcpu=ultrasparc -fomit-frame-pointer -pipe abc /usr/lib/gcc/sparc-unknown-linux-gnu/3.4.4/../../../crt1.o(.text+0x10): In function `_start': : undefined reference to `main' /usr/lib/gcc/sparc-unknown-linux-gnu/3.4.4/../../../crt1.o(.text+0x1c): In function `_start': : undefined reference to `main' collect2: ld returned 1 exit status -- [email protected] mailing list
