| 1 |
On Sunday 25 January 2004 13:18, Tom Martin wrote: |
| 2 |
> Hello all, |
| 3 |
> |
| 4 |
> Without wanting to become flame bait at all.. I'd just like to know why |
| 5 |
> -O3 is the default (commented) -O in make.conf, even for x86 stage |
| 6 |
> tarballs (I don't really know about the stageballs on other |
| 7 |
> architectures). Although the usefulness / harm of this flag has been |
| 8 |
> discussed to death, on the vast majority of x86 /desktop/ machines I |
| 9 |
> don't really think this flag is that suitable, and I know many agree. |
| 10 |
> |
| 11 |
> The reason I ask is because many people who didn't really change the |
| 12 |
> default flags beyond setting -march have come on #gentoo or on the |
| 13 |
> forums unsatisfied with performance of Gentoo, and there are also |
| 14 |
> several packages that still won't compile with -O3. |
| 15 |
> |
| 16 |
> As a default for x86, wouldn't -O2 be more suitable? My personal |
| 17 |
> viewpoint is that if you want to set -O3 on x86, go ahead. But if you |
| 18 |
> do, you should know why you want to do it, and what affects it will |
| 19 |
> have. Many beginners who haven't really got their heads around CFLAGS |
| 20 |
> will possibly read somewhere that -O3 gives the most optimisation and be |
| 21 |
> sold there and then. |
| 22 |
|
| 23 |
I would agree with this. Especially as gcc-3.2.3 is still the stable compiler. |
| 24 |
It has known code generation issues so should be avoided. |
| 25 |
|
| 26 |
Paul |
| 27 |
|
| 28 |
-- |
| 29 |
Paul de Vrieze |
| 30 |
Gentoo Developer |
| 31 |
Mail: pauldv@g.o |
| 32 |
Homepage: http://www.devrieze.net |
Archives