Use C++20. (#2322)

src/platform/linux/cuda.cpp

@@ -262,7 +262,7 @@ namespace cuda {
       fs::path sysfs_dir { sysfs_path };
       for (auto &entry : fs::directory_iterator { sysfs_dir }) {
         auto file = entry.path().filename();
-        auto filestring = file.generic_u8string();
+        auto filestring = file.generic_string();
         if (std::string_view { filestring }.substr(0, 4) != "card"sv) {
           continue;
         }
@@ -1049,4 +1049,4 @@ namespace platf {
 
     return display_names;
   }
-}  // namespace platf
+}  // namespace platf

src/platform/linux/input.cpp

@@ -1510,7 +1510,7 @@ namespace platf {
     std::stringstream ss;
     ss << std::hex << std::setfill('0');
     for (const auto &ch : str) {
-      ss << ch;
+      ss << static_cast<uint_least32_t>(ch);
     }
 
     std::string hex_unicode(ss.str());

src/platform/linux/kmsgrab.cpp

@@ -614,7 +614,7 @@ namespace platf {
         for (auto &entry : fs::directory_iterator { card_dir }) {
           auto file = entry.path().filename();
 
-          auto filestring = file.generic_u8string();
+          auto filestring = file.generic_string();
           if (filestring.size() < 4 || std::string_view { filestring }.substr(0, 4) != "card"sv) {
             continue;
           }
@@ -1641,7 +1641,7 @@ namespace platf {
     for (auto &entry : fs::directory_iterator { card_dir }) {
       auto file = entry.path().filename();
 
-      auto filestring = file.generic_u8string();
+      auto filestring = file.generic_string();
       if (std::string_view { filestring }.substr(0, 4) != "card"sv) {
         continue;
       }

src/platform/windows/input.cpp

@@ -1411,7 +1411,7 @@ namespace platf {
   ds4_update_state(gamepad_context_t &gamepad, const gamepad_state_t &gamepad_state) {
     auto &report = gamepad.report.ds4.Report;
 
-    report.wButtons = ds4_buttons(gamepad_state) | ds4_dpad(gamepad_state);
+    report.wButtons = static_cast<uint16_t>(ds4_buttons(gamepad_state)) | static_cast<uint16_t>(ds4_dpad(gamepad_state));
     report.bSpecial = ds4_special_buttons(gamepad_state);
 
     report.bTriggerL = gamepad_state.lt;

src/platform/windows/misc.cpp

@@ -1691,8 +1691,8 @@ namespace platf {
   }
   int64_t
   qpc_counter() {
-    LARGE_INTEGER performace_counter;
-    if (QueryPerformanceCounter(&performace_counter)) return performace_counter.QuadPart;
+    LARGE_INTEGER performance_counter;
+    if (QueryPerformanceCounter(&performance_counter)) return performance_counter.QuadPart;
     return 0;
   }