[Dune] [#674] strict-aliasing warnings with gcc-4.4

[Dune]

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The following task has a new comment added:

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

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Although some suggested solutions introduce a semantic change to iterators/enitypointers that would be better placed in 2.0 instead of 2.x I suggest to postpone this since there is no easy solution.

IMHO the best solution would be to
* clearly state '_must_ be compiled with -fno-strict-aliasing'
* note that 4.4 will produce wrong code without it but pre 4.4 gcc seemed to work fine
* automatically add -fno-strict-aliasing for gcc-4.x x>=4
* put this all this information also in a warning if compiled without -fno-strict-aliasing

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