[Config] Log commandline overrides

src/xenia/base/cvar.h

@@ -53,6 +53,7 @@ class IConfigVar : virtual public ICommandVar {
   virtual bool is_advanced() const = 0;
   virtual bool is_transient() const = 0;
   virtual std::string config_value() const = 0;
+  virtual std::string commandline_value() const = 0;
   virtual void LoadConfigValue(const toml::node* result) = 0;
   virtual void LoadGameConfigValue(const toml::node* result) = 0;
   virtual void ResetConfigValueToDefault() = 0;
@@ -93,6 +94,7 @@ class ConfigVar : public CommandVar<T>, virtual public IConfigVar {
                const char* display_name, const char* category, bool is_advanced,
                bool is_transient);
   std::string config_value() const override;
+  std::string commandline_value() const override;
   const T& GetTypedConfigValue() const;
   const std::string& category() const override;
   const std::string& display_name() const override;
@@ -296,6 +298,12 @@ std::string ConfigVar<T>::config_value() const {
   return this->ToString(this->default_value_);
 }
 template <class T>
+std::string ConfigVar<T>::commandline_value() const {
+  if (this->commandline_value_)
+    return this->ToString(*this->commandline_value_);
+  return config_value();
+}
+template <class T>
 const T& ConfigVar<T>::GetTypedConfigValue() const {
   return config_value_ ? *config_value_ : this->default_value_;
 }

src/xenia/config.cc

@@ -158,6 +158,19 @@ void ReadConfig(const std::filesystem::path& file_path,
     }
   }
 
+  // Log command line overrides (after config values are loaded)
+  bool has_overrides = false;
+  for (const auto& it : *cvar::ConfigVars) {
+    auto config_var = static_cast<cvar::IConfigVar*>(it.second);
+    if (config_var->commandline_value() != config_var->config_value()) {
+      if (!has_overrides) {
+        XELOGI("Command line overrides:");
+        has_overrides = true;
+      }
+      XELOGI("  {} = {}", config_var->name(), config_var->commandline_value());
+    }
+  }
+
   MigrateLegacyCvars(config);
   uint32_t config_defaults_date = defaults_date_cvar->GetTypedConfigValue();
   if (update_if_no_version_stored || config_defaults_date) {