Fails to build with Clang 19.1.x

[berolinux]

Trying to build vigra with clang 19.1.x fails because multi_iterator_coupled.hxx tries to modify the this pointer.

cd /home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/build/src/impex && /usr/bin/c++ -DHasEXR -DHasHDF5 -DHasJPEG -DHasPNG -DHasTIFF -DHasZLIB -Dvigraimpex_EXPORTS -I/home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/include -isystem /usr/include/OpenEXR -isystem /usr/include/Imath -pthread -ftemplate-depth-1024 -ftemplate-depth-1024 -std=gnu++11 -fPIC    -DH5_BUILT_AS_DYNAMIC_LIB -MD -MT src/impex/CMakeFiles/vigraimpex.dir/imageinfo.cxx.o -MF CMakeFiles/vigraimpex.dir/imageinfo.cxx.o.d -o CMakeFiles/vigraimpex.dir/imageinfo.cxx.o -c /home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/src/impex/imageinfo.cxx
In file included from /home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/src/impex/imageinfo.cxx:62:
In file included from /home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/include/vigra/imageinfo.hxx:58:
In file included from /home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/include/vigra/multi_iterator.hxx:43:
/home/bero/abf/vigra/BUILD/vigra-1.12.1-build/vigra-Version-1-12-1/include/vigra/multi_iterator_coupled.hxx:493:9: error: expression is not assignable
  493 |         --this;
      |         ^ ~~~~
1 error generated.
make[2]: *** [src/impex/CMakeFiles/vigraimpex.dir/build.make:219: src/impex/CMakeFiles/vigraimpex.dir/imageinfo.cxx.o] Error 1

[lazka]

In addition I get this with llvm 19:

C:/msys64/home/user/M/mingw-w64-vigra/src/vigra-Version-1-12-1/include/vigra/random_access_set.hxx:403:37: error: no member named 'operator()' in 'RandomAccessSet<Key, Compare, Alloc>'
  403 |    if((position == begin() || this->operator()(*(position-1),value))
      |                               ~~~~  ^
C:/msys64/home/user/M/mingw-w64-vigra/src/vigra-Version-1-12-1/include/vigra/random_access_set.hxx:404:35: error: no member named 'operator()' in 'RandomAccessSet<Key, Compare, Alloc>'
  404 |    && (position == end() || this->operator()(value, *position))) {