Re: [avr-libc-dev] [bug #19050] gcrt1.S should call main ratherthanjumping to it

[David Brown]

Marek Michalkiewicz wrote:
> On Tue, Feb 13, 2007 at 02:36:54PM -0700, Eric Weddington wrote:
>
> > I agree completely: -mcall-prologues is still desired if it produces smaller
> > code.
>
> OK, you may be right it still makes sense on the very small devices
> (I don't have a strong opinion, just a suggestion), though it's still
> possible to use the old toolchain with the old devices.  I certainly
> don't see much point in supporting it on the large (3-byte PC) devices.
>
> > In fact, this brings up the question as to why it is not the default?
>
> It's a tradeoff: smaller, but slower.
>
> Marek

Can the default be made dependant on the core?  Certainly 3-byte PC 
cores will have enough program space, but the for the smaller cores, you 
normally want to save space.

Alternatively, can the setting follow the optimisation flags?  -Os gives 
call prologues, -O2 gives inline prologues?

mvh.,

David