Re: [avr-gcc-list] -fwhole-program ate my ISR!

[Ned Konz]

On Apr 22, 2006, at 7:27 AM, Bernd Trog wrote:

> Ned, do you see any change in code size?

Well, it was smaller when it deleted the ISR <g>.

So far I've only tried this on toy programs, so I can't tell.

> > I found that adding
> >
> > __attribute__ ((used))
> >
> > before the ISR() definition kept this from happening.
>
> There is this "externally_visible" attribute too.
> I don't know which is better.

Hmm... I think it would probably be best to have both:

#ifdef __cplusplus
#define ISR(vector)                                    \
-extern "C" void vector(void) __attribute__ ((signal)); \
+extern "C" void vector(void) __attribute__ ((signal, used,  
externally_visible));       \
void vector (void)
#else
#define ISR(vector)                                    \
-void vector (void) __attribute__ ((signal));           \
+void vector (void) __attribute__ ((signal, used,  
externally_visible));         \
void vector (void)
#endif


--
Ned Konz
address@hidden