https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90646
--- Comment #6 from myLC at gmx dot net --- I'm afraid that wasn't it. I rebuilt the Nana (GUI) library with the same compiler (gcc/c++-9.1.0) and I'm still facing the same problem. Valgrind croaked with 'Process finished with exit code 9', which makes sense. The output shows the 'Invalid read of size 8' ( if (__ptr != nullptr) ) in unique_ptr.h: std::unique_ptr<std::filesystem::path::_List::_Impl,std::filesystem::path::_List::_Impl_deleter>::~unique_ptr() std::filesystem::path::_List::~_List() std::filesystem::path::~path() std::filesystem::current_path(std::error_code&) std::filesystem::current_path() std::filesystem::absolute(std::filesystem::path const&) Config::read(std::filesystem::path const&, std::string const&) main Address 0xb is not stack'd, malloc'd or (recently) free'd I'm in for a lot of fun, it seems...
