Re: [avr-gcc-list] Re: Removal of unused functions

[Bernd Trog]

On Tue, 22 Aug 2006, Joerg Wunsch wrote:

> Bernd Trog <address@hidden> wrote:
> > Use __attribute__((used)) for ISRs if you call gcc with -combine
> > -fwhole-program *.c.
>
> OK, that'll require changes in avr-libc (in the prototype for ISR()).
> Should be easy though.

Oh - the documentation for __attribute__((used)) makes no
guarantees about the symbol visibility.

We should use 'externally_visible' for ISRs:

| externally_visible:
| This attribute, attached to a global variable or function nullify effect
| of -fwhole-program command line option, so the object remain visible
| outside the current compilation unit.



It would probably better to do this in the compiler some how (if
'signal'|'innterrupt' then add 'externally_visible')?




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