[Dune] [#674] strict-aliasing warnings with gcc-4.4 (Attachment added)

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FS#674 - strict-aliasing warnings with gcc-4.4
User who did this - Carsten Gräser (Carsten)

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The attached example violates the strict aliasing rule. Compile itwith 'g++ -O3 -Wall strict_aliasing_rule.cc'.

With gcc-4.4 you get a warning about the violation and the result '1 n 3'. Previous gcc versions (I have at hand) don't warn and give '3 n 3'.

I'm not sure whether this comparable to what we are doing in the grid interface.
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