[Dune] [#491] PoolAllocator not 64 bit clean

[Dune]

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FS#491 - PoolAllocator not 64 bit clean
User who did this - Carsten Gräser (Carsten)

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Could you please also check with -Wstrict-aliasing=2 and -Wstrict-aliasing=1 ?

With -Wstrict-aliasing=1 my gcc-4.4.1 throws a lot of warnings for the sllisttest (on 32bit). With the more accurate levels 2 and 3 this does not happen. Level 1 is said to have more false positives. However the most accurate level 3 might also give false negative results.

I'm afraid we have to check these warnings by hand. Does anyone fully understand what the standard says ? The essence seems to be that most reinterpret_casts lead to undefined behaviour after dereferencing.
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