Compiliation fails with clang 19

[valentin-seitz]

When compiling the package with LLVM 19 i encountered the following errors:

./dccrg/dccrg.hpp:10597:33: error: no member named 'get_x_index' in 'Dccrg<type-parameter-0-0, type-parameter-0-1, tuple<type-parameter-0-2...>, tuple<type-parameter-0-3...>>'
 10597 |                 const uint64_t index1 = this->get_x_index(cell1);
       |                                         ~~~~  ^
./dccrg/dccrg.hpp:10598:33: error: no member named 'get_x_index' in 'Dccrg<type-parameter-0-0, type-parameter-0-1, tuple<type-parameter-0-2...>, tuple<type-parameter-0-3...>>'
 10598 |                 const uint64_t index2 = this->get_x_index(cell2);
       |                                         ~~~~  ^
./dccrg/dccrg.hpp:10627:33: error: no member named 'get_y_index' in 'Dccrg<type-parameter-0-0, type-parameter-0-1, tuple<type-parameter-0-2...>, tuple<type-parameter-0-3...>>'
 10627 |                 const uint64_t index1 = this->get_y_index(cell1);
       |                                         ~~~~  ^
./dccrg/dccrg.hpp:10628:33: error: no member named 'get_y_index' in 'Dccrg<type-parameter-0-0, type-parameter-0-1, tuple<type-parameter-0-2...>, tuple<type-parameter-0-3...>>'
 10628 |                 const uint64_t index2 = this->get_y_index(cell2);
       |                                         ~~~~  ^
./dccrg/dccrg.hpp:10657:33: error: no member named 'get_z_index' in 'Dccrg<type-parameter-0-0, type-parameter-0-1, tuple<type-parameter-0-2...>, tuple<type-parameter-0-3...>>'
 10657 |                 const uint64_t index1 = this->get_z_index(cell1);
       |                                         ~~~~  ^
./dccrg/dccrg.hpp:10658:33: error: no member named 'get_z_index' in 'Dccrg<type-parameter-0-0, type-parameter-0-1, tuple<type-parameter-0-2...>, tuple<type-parameter-0-3...>>'
 10658 |                 const uint64_t index2 = this->get_z_index(cell2);

Looking at the code we can see that functions bool {x,y,z}_indices_overlap(const uint64_t cell1, const uint64_t cell2) const call to get_{x,y,z}_index respectively.

dccrg/dccrg.hpp

Lines 11347 to 11348 in 98319b0

	const uint64_t index1 = this->get_x_index(cell1);
	const uint64_t index2 = this->get_x_index(cell2);

There is however no member function get_{x,y,z}_index available, so clang fails. I don't fully understand why gcc compiles it, but maybe it has to do with code-reachability.