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

[Bernd Trog]

Joerg wrote:

> I think avr-libc would at least have to add __attribute__((used)) to
> the interrupt vector declarators, wouldn't it?  Without that, IMHO the
> linker would assume the vectors to be dead code I'm afraid.

IMO, we should clearly distinguish between compile-time and link-time
optimizations:

compile-time: (gcc-4.1+)
Use __attribute__((used)) for ISRs if you call gcc with -combine 
-fwhole-program *.c.

link-time: (binutils ~2.10+)
Use KEEP(vectors) in the linker script if you call ld with --gc-sections.




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