From: realnc@arcor.de   
      
   João Jerónimo wrote:   
   > Hello,   
   >   
   > I'm gonna install GCC 4.3 now (hope it makes a new slot...) cause I've just   
   > installed an AMD Phenom (and corresponding motherboard), and want to   
   > optimize the system with -march=amdfam10.   
   >   
   > Are there any big problems with using this version on Gentoo to which I have   
   > to pay special atention?   
      
   First the obvious: you'll need to rebuild GCC right after you emerge it   
   since you need to put "-march=amdfam10" in make.conf *after* it has been   
   build with the previous GCC (which doesn't support "-march=amdfam10").   
   Only then you should rebuild system and world.   
      
   You'll need a recent glibc.  The stable one doesn't work with GCC 4.3.   
   I use glibc-2.8_p20080602.   
      
   I'm on Gentoo stable, but some packages don't build with 4.3.  You'll   
   need to keyword the few that don't compile.  From the major packages,   
   the kernel, Open Office, KDE and Firefox 3 don't have a problem.   
   Thunderbird does have a major one: it's compiled without optimizations   
   (-O0) and becomes slow as hell.  I had to modify the ebuild to force the   
   use of -O2 since the optimize-bug doesn't seem to affect me.   
      
   Other than that, I'm using GCC 4.3 ever since I first installed Gentoo   
   :P  (For "-march=core2".)   
      
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