--with-arch=i486 (was Re: Merging the jh branch to trunk)

[Jeremy Huntwork]

Matthew Burgess wrote:
> On Thu, 06 Sep 2007 16:09:02 +1000, Greg Schafer <gschafer at zip.com.au> wrote:
> 
>> But getting back on topic, I personally don't buy any of the arguments for
>> using `--with-arch=i486' listed in this ticket:
> 
> OK, as I also don't want to inflict default optimisation choices on LFSers I can see your point of view

All of Gregs arguments appear to be rational. However, before I again 
make a decision based on someone else's research, and change the jh 
branch to something else, I'm going to be digging into this a little 
further. Although, I probably won't be able to really touch it until 
tomorrow night.

Matt, as far as CFLAGS go, IIRC, glibc must be built with some level of 
optimization. If you set CFLAGS on the command line, I believe you're 
overriding what is included by default in the Makefile system, so you 
must also include some -O option in CFLAGS. -O2 is what Greg uses in 
DIY. I would think that it would be more ideal to find exactly what it 
is in the Glibc build system that defaults to i386 and change those 
defaults with a sed of some sort to be i486.

Be warned that I'm just speaking from memory here. As I said above, I 
will be spending time digging so that I understand the whole system 
better, but if you get there first, great. Whoever commits this to trunk 
should understand thoroughly the issue - a mistake I admit I made with 
the jh branch.

--
JH