Fix error

src/constants.h

@@ -105,3 +105,8 @@
 // The intent is to ensure that the rendering doesn't turn terribly blurry
 // when filtering is enabled.
 #define TEXTURE_FILTER_MIN_SIZE 192U
+
+
+// Luanti config filenames
+#define CONFIGFILE "luanti.conf"
+#define LEGACY_CONFIGFILE "minetest.conf"

src/main.cpp

@@ -60,8 +60,6 @@ extern "C" {
 #error ==================================
 #endif
 
-#define CONFIGFILE "luanti.conf"
-#define LEGACY_CONFIGFILE "minetest.conf"
 #define DEBUGFILE "debug.txt"
 #define DEFAULT_SERVER_PORT 30000
 
@@ -743,28 +741,10 @@ static void startup_message()
 }
 
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
-static std::string xdg_get_config_dir() {
-	const char *const xdg_config_home = getenv("XDG_CONFIG_HOME");
-	if (xdg_config_home)
-		return std::string(xdg_config_home) + DIR_DELIM "luanti";
-
-	const char *const home = getenv("HOME");
-	// In rare cases the HOME environment variable may be unset
-	FATAL_ERROR_IF(!home,
-		"Required environment variable HOME is not set");
-	return std::string(home) + DIR_DELIM ".config" DIR_DELIM "luanti";
-}
-#endif
-
 static bool read_config_file(const Settings &cmd_args)
 {
 	// Path of configuration file in use
 	sanity_check(g_settings_path.empty());	// Sanity check
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
-	fs::CreateAllDirs(xdg_get_config_dir());
-#endif
-
 	if (cmd_args.exists("config")) {
 		bool r = g_settings->readConfigFile(cmd_args.get("config").c_str());
 		if (!r) {
@@ -775,9 +755,9 @@ static bool read_config_file(const Settings &cmd_args)
 		g_settings_path = cmd_args.get("config");
 	} else {
 		std::vector<std::string> filenames;
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
-		filenames.push_back(xdg_get_config_dir() + DIR_DELIM CONFIGFILE);
-#endif
+		std::optional<std::string> platform_specific_filename = porting::getPlatformSpecificConfigFile();
+		if (platform_specific_filename != std::nullopt)
+			filenames.push_back(platform_specific_filename.value());
 		// Legacy configuration file location
 		filenames.push_back(porting::path_user + DIR_DELIM + LEGACY_CONFIGFILE);
 		// Very legacy configuration file location

src/porting.cpp

@@ -474,6 +474,7 @@ void migrateLegacyDirs() {
 #elif defined(__ANDROID__)
 
 extern bool setSystemPaths(); // defined in porting_android.cpp
+extern void migrateLegacyDirs(); // defined in porting_android.cpp
 
 
 //// XDG systems
@@ -1015,4 +1016,28 @@ void TriggerMemoryTrim()
 
 #endif
 
+#if defined(__ANDROID__)
+std::optional<std::string> getPlatformSpecificConfigFile() {
+	return std::nullopt;
+}
+#elif defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
+static std::string xdg_get_config_dir() {
+	const char *const xdg_config_home = getenv("XDG_CONFIG_HOME");
+	if (xdg_config_home)
+		return std::string(xdg_config_home) + DIR_DELIM "luanti";
+	return std::string(getHomeOrFail()) + DIR_DELIM ".config" DIR_DELIM "luanti";
+}
+
+std::optional<std::string> getPlatformSpecificConfigFile() {
+	std::string config_home = xdg_get_config_dir();
+	fs::CreateAllDirs(config_home);
+	return config_home + DIR_DELIM CONFIGFILE;
+}
+
+#else
+std::optional<std::string> getPlatformSpecificConfigFile() {
+	return std::nullopt;
+}
+#endif
+
 } //namespace porting

src/porting.h

@@ -14,6 +14,7 @@
 
 // Be mindful of what you include here!
 #include <string>
+#include <optional>
 #include "config.h"
 #include "irrlichttypes.h" // u64
 #include "debug.h"
@@ -121,6 +122,8 @@ void initializePaths();
 
 void migrateLegacyDirs();
 
+std::optional<std::string> getPlatformSpecificConfigFile();
+
 /*
 	Return system information
 	e.g. "Linux/3.12.7 x86_64"

src/porting_android.cpp

@@ -40,6 +40,7 @@ namespace porting {
 	void cleanupAndroid();
 	std::string getLanguageAndroid();
 	bool setSystemPaths(); // used in porting.cpp
+	void migrateLegacyDirs(); // used in porting.cpp
 }
 
 extern "C" int SDL_Main(int _argc, char *_argv[])
@@ -99,6 +100,10 @@ static std::string readJavaString(jstring j_str)
 	return str;
 }
 
+void migrateLegacyDirs() {
+	// Real migration in android/
+}
+
 bool setSystemPaths()
 {
 	// Set user and share paths