Re: [cc65] How to force a read from a memory mapped register w/o volatile

On Dienstag 07 Dezember 2010, Ullrich von Bassewitz wrote:
> On Tue, Dec 07, 2010 at 03:33:53PM +0100, Groepaz wrote:
> > what about using an external symbol, the optimizer wont touch it then,
> > right? ie define HWREG=$2000 in the linker config, then import that
> > symbol and use it in the code ? shouldnt this work? :)
> 
> No. Using an external symbol won't prevent the optimizer to remove a load
> from this location if it finds that the value is never used later (given
> that volatile has no effect). Why should it?

mmh now you say it.... good question =)

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