Commits on Jan 18, 2024

1. base/tensor.h: work around bogus compiler warning …

   gcc-9.4 warnings loudly about an unused argument "end":
   
   ```
   In file included from ../include/deal.II/base/symmetric_tensor.h:26,
                    from ../include/deal.II/base/array_view.h:23,
                    from ../source/base/tensor.cc:16:
   ../include/deal.II/base/tensor.h: In instantiation of 'void dealii::Tensor<rank_, dim, Number>::unroll(Iterator, Iterator) const [with Iterator = float*; int rank_ = 1; int dim = 1; Number = float]':
   ../include/deal.II/base/tensor.h:1736:11:   required from 'void dealii::Tensor<rank_, dim, Number>::unroll(Iterator, Iterator) const [with Iterator = float*; int rank_ = 2; int dim = 1; Number = float]'
   ../source/base/tensor.cc:52:5:   required from 'void dealii::{anonymous}::calculate_svd_in_place(dealii::Tensor<2, dim, Number>&, dealii::Tensor<2, dim, Number>&) [with int dim = 1; Number = float]'
   ../source/base/tensor.cc:85:25:   required from 'dealii::Tensor<2, dim, Number> dealii::project_onto_orthogonal_tensors(const dealii::Tensor<2, dim, Number>&) [with int dim = 1; Number = float]'
   ../source/base/tensor.cc:92:60:   required from here
   ../include/deal.II/base/tensor.h:1728:51: warning: parameter 'end' set but not used [-Wunused-but-set-parameter]
    1728 |                                    const Iterator end) const
         |
   ```
   
   This is of course bogus, the compiler simply lost track of the
   `if constexpr(...)` branch. This is fixed in later gcc versions. Let's
   simply use the usual `(void)parameter` strategy to make gcc-9.4 happy.

   

   tamiko committed Jan 18, 2024
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