Re: Rationale for some rules in style guide

[Joerg Sonnenberger <joerg%bec.de@localhost>]

Am Wed, Apr 12, 2023 at 05:16:55AM -0700 schrieb Carlo Arenas:
> On Wed, Apr 12, 2023 at 5:07 AM Joerg Sonnenberger <joerg%bec.de@localhost> wrote:
> >
> > Am Wed, Apr 12, 2023 at 09:17:49AM -0000 schrieb Michael van Elst:
> > > joerg%bec.de@localhost (Joerg Sonnenberger) writes:
> > >
> > > >Which compiler from this century doesn't allocate stack space
> > > >independent from the source order?
> > >
> > > gcc with -O0 and -O1 allocates variables in source order.
> >
> > More by accident, not guaranteed.
> 
> FWIW clang also does with -O0, not sure if it proves it is a common
> mistake to make or there might be some intention to it.

It's not a mistake. Just that -O0 (and for gcc, -O1) effectively ask the
compiler "just do whatever is easiest". Given how bad code generation in
those modes is anyway, it's completely pointless to argue and optimize
for this mode.

Joerg