tests fail with ffast-math (using clang-11)
On my local machine quite a few tests fail when I use -ffast-math with clang-11. An example is fmatrixtest
which outputs
error: norm not NaN: frobenius_norm() on line 760 (type: Dune::FieldVector<double, 2> const)
looptest
is another example (with a lot of output).