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

[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 you also create the Intersection in the constructor the warnings are gone. And this also seems to fix my Heisenbug. The extended patch is attached.

Perhaps we should compile all tests with '-O3 -Wall' to trigger all such bugs since you might no notice the 'wrong' inlining else. Notice that '-Wall' alone does not trigger this if '-fstrict-aliasing' is not enabled.
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