Upgrade codebase to C++ 20 + fix warnings + update submodules (#6115)

src/common/logging/formatter.h

@@ -0,0 +1,22 @@
+// Copyright 2022 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <type_traits>
+#include <fmt/format.h>
+
+// adapted from https://github.com/fmtlib/fmt/issues/2704
+// a generic formatter for enum classes
+#if FMT_VERSION >= 80100
+template <typename T>
+struct fmt::formatter<T, std::enable_if_t<std::is_enum_v<T>, char>>
+    : formatter<std::underlying_type_t<T>> {
+    template <typename FormatContext>
+    auto format(const T& value, FormatContext& ctx) -> decltype(ctx.out()) {
+        return fmt::formatter<std::underlying_type_t<T>>::format(
+            static_cast<std::underlying_type_t<T>>(value), ctx);
+    }
+};
+#endif

src/common/logging/log.h

@@ -4,10 +4,10 @@
 
 #pragma once
 
+#include <algorithm>
 #include <array>
-#include <fmt/format.h>
 #include "common/common_types.h"
-
+#include "common/logging/formatter.h"
 namespace Log {
 
 // trims up to and including the last of ../, ..\, src/, src\ in a string