cor3ntin wrote:
Reduced further
```cpp
template <int dim, int = dim> class DoFHandler;
template <int dim, int = dim> class FiniteElement;
template <int dim, class InVector, class OutVector, int spacedim>
void back_interpolate(const DoFHandler<dim, spacedim> &, const InVector &,
const FiniteElement<dim, spacedim> &, OutVector &){};
template <int dim, template <int> class DH,
class InVector, class OutVector,
int spacedim>
void back_interpolate(const DH<dim> &, InVector,
const FiniteElement<dim, spacedim> &, OutVector){};
template void back_interpolate(const DoFHandler<3> &, const double &,
const FiniteElement<3> &, double &);
```
https://compiler-explorer.com/z/5az5s8jMh
Both GCC and Clang trunk reject that code and i believe this is the conforming
behavior.
@zygoloid Do you think we should explore some sort of mitigation strategy here?
(a flag to restore the old behavior?)
Looking at that code, it's unclear how either is considered a better
specialization by clang 18
https://github.com/llvm/llvm-project/pull/100692
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