Merge pull request #1586 from Deltajom/cpp20dev

Specify std::error_code usage in parser.cpp, without it fails to comp…

Author: evoskuil

src/config/parser.cpp

@@ -28,7 +28,6 @@ namespace config {
 
 using namespace std::filesystem;
 using namespace boost::program_options;
-using namespace boost::system;
 
 BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
 
@@ -93,7 +92,7 @@ bool parser::load_configuration_variables(variables_map& variables,
     const auto config_path = get_config_option(variables, option_name);
 
     // If the existence test errors out we pretend there's no file :/.
-    error_code code;
+    std::error_code code;
     if (!config_path.empty() && exists(config_path, code))
     {
         const auto& path = config_path.string();