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Re: [avr-gcc-list] GCC loop optimization and volatile data question
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From: |
J Wunsch |
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Subject: |
Re: [avr-gcc-list] GCC loop optimization and volatile data question |
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Date: |
Sun, 22 Apr 2001 23:05:38 +0200 (MET DST) |
"Larry Barello" <address@hidden> writes:
> extern int some_external_variable;
> ...
> while (...)
> {
> ...
> if (some_external_variable == 0)
> break;
> }
>
> do I need to declare 'some_external_variable' as volatile?
Sure. Linkage classes are totally irrelevant for optimization
considerations (which is why you need `volatile').
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)