Re: [avr-gcc-list] How to use pgmspace.h in a library source without warning?

[Georg-Johann Lay]

Thomas D. Dean schrieb:
> On 06/07/13 09:53, Georg-Johann Lay wrote:
> > Suppose the following include in a library source.c:
> >
> > #include <avr/pgmspace.h>
> >
> > and the source compiled with, e.g. -mmcu=avr5 or -mmcu=avr35 etc.
> >
> > This throws a warning like:
> >
> > $ avr-gcc -mmcu=avr5 source.c -c
> >
> > In file included from INSTALL/avr/include/avr/pgmspace.h:88:0,
> >                   from source.c:1:
> > INSTALL/avr/include/avr/io.h:428:6: warning: #warning "device type not
> > defined" [-Wcpp]
> >
> > Is there a way to build library modules that use pgmspace functionality
> > without such annoying warning?
>
> Look at avr/io.h, where the warning is issued.  avr5 is not one of the 
> defined device types.
>
> You have to use a specific device.
>
> Tom Dean

That's not a good approach.  Reading avr/io.h, the solution reads

#define __COMPILING_AVR_LIBC__


Libraries are typically defined for groups of devices, not for each of 
the ~ 200 AVR devices...

Johann