[Bug c/20523] gcc 3.4.3 optimizes volatile vars away (gcc 3.4.3 >= -O2)

[ltg at zes dot uni-bremen dot de]

------- Additional Comments From ltg at zes dot uni-bremen dot de  2005-03-17 21:37 -------
Subject: RE:  gcc 3.4.3 optimizes volatile vars away (gcc 3.4.3 >= -O2)


On 17-Mar-2005 pinskia at gcc dot gnu dot org wrote:
> 
> ------- Additional Comments From pinskia at gcc dot gnu dot org  2005-03-17
> 20:58 -------
> You need to mark the variable as used.

Hmmm, I thought "volatile" is suffient in order to prevent the
compiler from optimizing those variables away.

Anyway, I checked the docs and found that I can mark a function
as used (with __attribute__ ((used)) ), but not variables (and types).
Either it´s not in the docs or I looked in the wrong place.
Can you tell me how to mark a variable as used?

Thanks.

Lothar

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E-Mail: ltg@zes.uni-bremen.de
Date: 17-Mar-2005
Time: 22:20:02

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20523