Re: [avr-gcc-list] regression in size from 4.2.2 to 4.5.0

[Rolf Ebert]

Weddington, Eric schrieb:
> > -----Original Message-----
> > From: 
> > address@hidden 
> > [mailto:address@hidden
> > org] On Behalf Of Bob Paddock
> > Sent: Friday, May 08, 2009 6:55 PM
> > To: address@hidden
> > Subject: Re: [avr-gcc-list] regression in size from 4.2.2 to 4.5.0
> >
> > > > 1) -no-inline-small-function    - 69034
> > > > 2) --param inline-call-cost=2   - 68964
> > > > 3) -fno-inline                  - 68816
> > > > 4) -finline-limit=10            - 68810
> > > > 5) #2 & #4                      - 68754 6) 
> > -finline-limit=3             -
> > > > 68754 (same results for 1,2 and 3)
> > > I found that it depends on your source codes
> > > To get better code size, you have to try different switches 
> > combinations.
> >
> > Is there any way to apply the switches on a per source file basis?
>
> Yes, it's called "using a Makefile". ;-)

You can, for example, define the CFLAGS depending on the target

foo.o: CFLAGS += -no-inline-small-functions
bar.o: CFLAGS += --param inline-call-cost=2 -finline-limit=10

and leave everything else as it is provided in the sample Makefile.

Beware that the above syntax might be a GNU extension and not be 
available elsewhere.

   Rolf