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

src/core/hle/kernel/shared_page.cpp

@@ -94,7 +94,7 @@ u64 Handler::GetSystemTime() const {
     epoch_tm.tm_mon = 0;
     epoch_tm.tm_year = 100;
     epoch_tm.tm_isdst = 0;
-    u64 epoch = std::mktime(&epoch_tm) * 1000;
+    s64 epoch = std::mktime(&epoch_tm) * 1000;
 
     // 3DS console time uses Jan 1 1900 as internal epoch,
     // so we use the milliseconds between 1900 and 2000 as base console time

src/core/hle/service/apt/apt.cpp

@@ -262,8 +262,8 @@ void Module::APTInterface::GetSharedFont(Kernel::HLERequestContext& ctx) {
     // kernel version and an applet with new kernel version run at the same time, and they both use
     // shared font, different linear heap region would have required shared font to relocate
     // according to two different addresses at the same time, which is impossible.
-    VAddr target_address =
-        apt->shared_font_mem->GetLinearHeapPhysicalOffset() + Memory::LINEAR_HEAP_VADDR;
+    VAddr target_address = static_cast<VAddr>(apt->shared_font_mem->GetLinearHeapPhysicalOffset()) +
+                           Memory::LINEAR_HEAP_VADDR;
     if (!apt->shared_font_relocated) {
         BCFNT::RelocateSharedFont(apt->shared_font_mem, target_address);
         apt->shared_font_relocated = true;

src/core/hle/service/service.cpp

@@ -150,15 +150,15 @@ void ServiceFrameworkBase::ReportUnimplementedFunction(u32* cmd_buf, const Funct
     int num_params = header.normal_params_size + header.translate_params_size;
     std::string function_name = info == nullptr ? fmt::format("{:#08x}", cmd_buf[0]) : info->name;
 
-    fmt::memory_buffer buf;
-    fmt::format_to(buf, "function '{}': port='{}' cmd_buf={{[0]={:#x}", function_name, service_name,
-                   cmd_buf[0]);
+    std::string result = fmt::format("function '{}': port='{}' cmd_buf={{[0]={:#x}", function_name,
+                                     service_name, cmd_buf[0]);
     for (int i = 1; i <= num_params; ++i) {
-        fmt::format_to(buf, ", [{}]={:#x}", i, cmd_buf[i]);
+        result += fmt::format(", [{}]={:#x}", i, cmd_buf[i]);
     }
-    buf.push_back('}');
 
-    LOG_ERROR(Service, "unknown / unimplemented {}", fmt::to_string(buf));
+    result.push_back('}');
+
+    LOG_ERROR(Service, "unknown / unimplemented {}", result);
     // TODO(bunnei): Hack - ignore error
     header.normal_params_size.Assign(1);
     header.translate_params_size.Assign(0);