make buildword problem/documentation

[Giorgos Keramidas]

On 2006-04-11 21:10, Giorgos Keramidas <keramida at ceid.upatras.gr> wrote:
> On 2006-04-11 17:50, Jim Stapleton <stapleton.41 at gmail.com> wrote:
> > ahh, thanks everyone, I was looking through the document, and focused
> > on finding "buildworld".
> >
> > Still, anyone know why those particular cflags would cause problems?
>
> Don't use arbitrary CFLAGS in `make.conf'.  The build is already
> complicated enough and careful steps have to be taken, without the
> introduction of random flags.

On 2006-04-11 18:27, Jim Stapleton <stapleton.41 at gmail.com> wrote:
> ok, thanks, I won't worry about it then.

Cool.

> I just like to have everything as optimised as possible. Guess it'll
> have to wait here...

There are cases when things break in one or another way if you enable
optimizations for all the builds, in make.conf.  The warning near the
description of CFLAGS in `/usr/share/examples/etc/make.conf' is there
exactly to avoid this sort of thing:

# Note that optimization settings other than -O and -O2 are not recommended
# or supported for compiling the world or the kernel - please revert any
# nonstandard optimization settings to "-O" or -O2 before submitting bug
# reports without patches to the developers.

So, unless there is a measurable performance gain which doesn't also
result in strange build- or runtime errors, I guess you don't need to
worry about it too much :)