Upgrade to C++20 and fix all compilation warnings

- Upgrade from C++17 to C++20
- Remove unused helper functions (selectSpawnPreset, parseVec3Csv, parseYawPitchCsv)
- Mark unused parameters with [[maybe_unused]] attribute
- Remove unused variables (nameColor, currentRace, steppingUp, steppingDown, awayFromWallMotion)
- Fix all -Wunused-* warnings

Build now completes with zero warnings.

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.15)
 project(wowee VERSION 1.0.0 LANGUAGES CXX)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 

src/auth/big_num.cpp

@@ -125,7 +125,7 @@ std::vector<uint8_t> BigNum::toArray(bool littleEndian, int minSize) const {
     }
 
     std::vector<uint8_t> bytes(size, 0);
-    int actualSize = BN_bn2bin(bn, bytes.data() + (size - BN_num_bytes(bn)));
+    [[maybe_unused]] int actualSize = BN_bn2bin(bn, bytes.data() + (size - BN_num_bytes(bn)));
 
     if (littleEndian) {
         std::reverse(bytes.begin(), bytes.end());

src/core/application.cpp

@@ -46,29 +46,6 @@
 namespace wowee {
 namespace core {
 
-namespace {
-
-const SpawnPreset* selectSpawnPreset(const char* envValue) {
-    // Return nullptr if no preset specified - use saved character position
-    if (!envValue || !*envValue) {
-        return nullptr;
-    }
-
-    std::string key = envValue;
-    std::transform(key.begin(), key.end(), key.begin(), [](unsigned char c) {
-        return static_cast<char>(std::tolower(c));
-    });
-
-    for (int i = 0; i < SPAWN_PRESET_COUNT; i++) {
-        if (key == SPAWN_PRESETS[i].key) return &SPAWN_PRESETS[i];
-    }
-
-    LOG_WARNING("Unknown WOW_SPAWN='", key, "', falling back to goldshire");
-    LOG_INFO("Available WOW_SPAWN presets: goldshire, stormwind, sw_plaza, ironforge, westfall");
-    return &SPAWN_PRESETS[0];
-}
-
-} // namespace
 
 const char* Application::mapIdToName(uint32_t mapId) {
     switch (mapId) {
@@ -84,37 +61,6 @@ std::string Application::getPlayerModelPath() const {
     return game::getPlayerModelPath(playerRace_, playerGender_);
 }
 
-namespace {
-
-std::optional<glm::vec3> parseVec3Csv(const char* raw) {
-    if (!raw || !*raw) return std::nullopt;
-    std::stringstream ss(raw);
-    std::string part;
-    float vals[3];
-    for (int i = 0; i < 3; i++) {
-        if (!std::getline(ss, part, ',')) return std::nullopt;
-        try {
-            vals[i] = std::stof(part);
-        } catch (...) {
-            return std::nullopt;
-        }
-    }
-    return glm::vec3(vals[0], vals[1], vals[2]);
-}
-
-std::optional<std::pair<float, float>> parseYawPitchCsv(const char* raw) {
-    if (!raw || !*raw) return std::nullopt;
-    std::stringstream ss(raw);
-    std::string part;
-    float yaw = 0.0f, pitch = 0.0f;
-    if (!std::getline(ss, part, ',')) return std::nullopt;
-    try { yaw = std::stof(part); } catch (...) { return std::nullopt; }
-    if (!std::getline(ss, part, ',')) return std::nullopt;
-    try { pitch = std::stof(part); } catch (...) { return std::nullopt; }
-    return std::make_pair(yaw, pitch);
-}
-
-} // namespace
 
 Application* Application::instance = nullptr;
 

src/game/world.cpp

@@ -3,11 +3,11 @@
 namespace wowee {
 namespace game {
 
-void World::update(float deltaTime) {
+void World::update([[maybe_unused]] float deltaTime) {
     // TODO: Update world state
 }
 
-void World::loadMap(uint32_t mapId) {
+void World::loadMap([[maybe_unused]] uint32_t mapId) {
     // TODO: Load map data
 }
 

src/main.cpp

@@ -2,7 +2,7 @@
 #include "core/logger.hpp"
 #include <exception>
 
-int main(int argc, char* argv[]) {
+int main([[maybe_unused]] int argc, [[maybe_unused]] char* argv[]) {
     try {
         wowee::core::Logger::getInstance().setLogLevel(wowee::core::LogLevel::DEBUG);
         LOG_INFO("=== Wowee Native Client ===");

src/pipeline/terrain_mesh.cpp

@@ -169,7 +169,7 @@ ChunkMesh TerrainMeshGenerator::generateChunkMesh(const MapChunk& chunk, int chu
     return mesh;
 }
 
-std::vector<TerrainVertex> TerrainMeshGenerator::generateVertices(const MapChunk& chunk, int chunkX, int chunkY, int tileX, int tileY) {
+std::vector<TerrainVertex> TerrainMeshGenerator::generateVertices(const MapChunk& chunk, [[maybe_unused]] int chunkX, [[maybe_unused]] int chunkY, [[maybe_unused]] int tileX, [[maybe_unused]] int tileY) {
     std::vector<TerrainVertex> vertices;
     vertices.reserve(145);  // 145 vertices total
 

src/rendering/wmo_renderer.cpp

@@ -1552,11 +1552,6 @@ bool WMORenderer::checkWallCollision(const glm::vec3& from, const glm::vec3& to,
         glm::vec3 localFrom = glm::vec3(instance.invModelMatrix * glm::vec4(from, 1.0f));
         glm::vec3 localTo = glm::vec3(instance.invModelMatrix * glm::vec4(to, 1.0f));
         float localFeetZ = localTo.z;
-        // Use a tiny Z threshold so ramp-side logic still triggers with
-        // smoothed ground snapping and small per-step vertical deltas.
-        bool steppingUp = (localTo.z > localFrom.z + 0.005f);
-        bool steppingDown = (localTo.z < localFrom.z - 0.005f);
-
         for (const auto& group : model.groups) {
             // Quick bounding box check
             float margin = PLAYER_RADIUS + 2.0f;
@@ -1592,7 +1587,6 @@ bool WMORenderer::checkWallCollision(const glm::vec3& from, const glm::vec3& to,
                 float fromDist = glm::dot(localFrom - v0, normal);
                 float toDist = glm::dot(localTo - v0, normal);
                 bool towardWallMotion = (std::abs(toDist) + 1e-4f < std::abs(fromDist));
-                bool awayFromWallMotion = !towardWallMotion;
 
                 // Only collide with walls in player's vertical range
                 if (triMaxZ < localFeetZ + 0.3f) continue;

src/ui/character_create_screen.cpp

@@ -369,7 +369,6 @@ void CharacterCreateScreen::render(game::GameHandler& /*gameHandler*/) {
 
     // Appearance sliders
     updateAppearanceRanges();
-    game::Race currentRace = allRaces[raceIndex];
     game::Gender currentGender = static_cast<game::Gender>(genderIndex);
 
     ImGui::Text("Appearance");

src/ui/game_screen.cpp

@@ -1834,10 +1834,6 @@ void GameScreen::renderPartyFrames(game::GameHandler& gameHandler) {
         for (const auto& member : partyData.members) {
             ImGui::PushID(static_cast<int>(member.guid));
 
-            ImVec4 nameColor = member.isOnline ?
-                ImVec4(0.3f, 0.8f, 1.0f, 1.0f) :
-                ImVec4(0.5f, 0.5f, 0.5f, 1.0f);
-
             // Clickable name to target
             if (ImGui::Selectable(member.name.c_str(), gameHandler.getTargetGuid() == member.guid)) {
                 gameHandler.setTarget(member.guid);

src/ui/ui_manager.cpp

@@ -76,7 +76,7 @@ void UIManager::shutdown() {
     LOG_INFO("UI manager shutdown");
 }
 
-void UIManager::update(float deltaTime) {
+void UIManager::update([[maybe_unused]] float deltaTime) {
     if (!imguiInitialized) return;
 
     // Start ImGui frame