Is this expected gcc behaviour?

[Paul Smith]

If you don't want the compiler to optimize that variable you have to
declare it to be volatile.  That's what volatile is for...

-- 
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 Paul D. Smith <psmith@nortelnetworks.com>   HASMAT--HA Software Mthds & Tools
 "Please remain calm...I may be mad, but I am a professional." --Mad Scientist
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   These are my opinions---Nortel Networks takes no responsibility for them.

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