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

[Dune]

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

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If the grids really violate the strict aliasing rule assumed by '-O3' the following might be related:

I have one application that produces wrong results with '-O3' and gcc-4.4.1. This does not happen with '-O3 -fno-strict-aliasing' or older gcc versions. The code seems correct and any try to debug this makes the bug vanish by avoiding inlining.

Unfortunately the code uses subgrid and our discretization framework which makes it very complicated to extract a test case.
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