Akumuli @0.8.78: error: cannot decrement expression of enum type

[ryandesign (Ryan Carsten Schmidt)]

​Akumuli has this build error at least on 10.8:

/usr/bin/../lib/c++/v1/algorithm:2003:32: error: cannot decrement expression of enum type 'Akumuli::StorageEngine::IOVecBlock::<anonymous enum at /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_databases_Akumuli/Akumuli/work/Akumuli-0.8.78/libakumuli/storage_engine/volume.h:48:5>'
    for (; __n > 0; ++__first, --__n)
                               ^
/usr/bin/../lib/c++/v1/algorithm:2029:18: note: in instantiation of function template specialization 'std::__1::__fill_n<std::__1::back_insert_iterator<std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > >, Akumuli::StorageEngine::IOVecBlock::<anonymous enum at /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_databases_Akumuli/Akumuli/work/Akumuli-0.8.78/libakumuli/storage_engine/volume.h:48:5>, int>' requested here
   return _VSTD::__fill_n(__first, __n, __value_);
                 ^
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_databases_Akumuli/Akumuli/work/Akumuli-0.8.78/libakumuli/storage_engine/blockstore.cpp:563:18: note: in instantiation of function template specialization 'std::__1::fill_n<std::__1::back_insert_iterator<std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > >, Akumuli::StorageEngine::IOVecBlock::<anonymous enum at /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_databases_Akumuli/Akumuli/work/Akumuli-0.8.78/libakumuli/storage_engine/volume.h:48:5>, int>' requested here
            std::fill_n(std::back_inserter(buffer_), IOVecBlock::COMPONENT_SIZE, 0);
                 ^

[barracuda156]

Replying to ryandesign:

The current v. 0.8.80 does not exhibit this error, though it still needs a fix for Clang builds. If you could take a look, it will be awesome – maybe you know how to fix that: ​https://github.com/macports/macports-ports/pull/15631#issuecomment-1207142749

[barracuda156]

In 3da501d9ddf1b6cb3a5bc1de6558ffe4f0d0e519/macports-ports (master):

Akumuli: update to 0.8.80, fix the build (​https://github.com/macports/macports-ports/pull/15631)

Fixes: #60658