add default cases

Adding default case for cases where the compilation flag
-Wswitch-default is present on the command line when spdlog is
included in external projects.
Signed-off-by: Ryan Sherlock <ryan.m.sherlock@gmail.com>

include/spdlog/fmt/bundled/core.h

@@ -1350,6 +1350,8 @@ FMT_CONSTEXPR_DECL FMT_INLINE auto visit_format_arg(
     return vis(arg.value_.pointer);
   case detail::type::custom_type:
     return vis(typename basic_format_arg<Context>::handle(arg.value_.custom));
+  default:
+    break;
   }
   return vis(monostate());
 }

include/spdlog/fmt/bundled/format.h

@@ -2814,6 +2814,8 @@ FMT_CONSTEXPR const Char* parse_align(const Char* begin, const Char* end,
     case '^':
       align = align::center;
       break;
+    default:
+      break;
     }
     if (align != align::none) {
       if (p != begin) {
@@ -2897,6 +2899,8 @@ FMT_CONSTEXPR const Char* parse_format_specs(const Char* begin, const Char* end,
     handler.on_space();
     ++begin;
     break;
+  default:
+    break;
   }
   if (begin == end) return begin;
 

include/spdlog/sinks/ansicolor_sink-inl.h

@@ -106,6 +106,8 @@ SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
     case color_mode::never:
         should_do_colors_ = false;
         return;
+    default:
+        should_do_colors_ = false;
     }
 }