Detect debug mode in platform code of desktop

app/linux/main.cc

@@ -1,6 +1,12 @@
 #include "my_application.h"
 
 int main(int argc, char** argv) {
+#ifndef NDEBUG
+  printf("This app works in debug mode\n");
+#else
+  printf("This app works in release mode\n");
+#endif
+
   g_autoptr(MyApplication) app = my_application_new();
   return g_application_run(G_APPLICATION(app), argc, argv);
 }

app/macos/Runner/AppDelegate.swift

@@ -23,6 +23,11 @@ class AppDelegate: FlutterAppDelegate {
   public override func application(_ application: NSApplication,
                                   continue userActivity: NSUserActivity,
                                   restorationHandler: @escaping ([any NSUserActivityRestoring]) -> Void) -> Bool {
+#if DEBUG
+    print("This app works in debug mode")
+#else
+    print("This app works in release mode")
+#endif
 
     guard let url = AppLinks.shared.getUniversalLink(userActivity) else {
       return false

app/windows/runner/main.cpp

@@ -8,6 +8,11 @@
 
 int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
                       _In_ wchar_t *command_line, _In_ int show_command) {
+#ifdef _DEBUG
+  println("This app works in debug mode");
+#else
+  println("This app works in release mode");
+#endif
 
   HWND hwnd = ::FindWindow(L"FLUTTER_RUNNER_WIN32_WINDOW", L"Acter");
   if (hwnd != NULL) {