Merge branch '5.2' into 5.3

* 5.2:
  [Console] Run commands when implements SignalableCommandInterface without pcntl and they have'nt signals
  [Form] Fix 'invalid_message' use in multiple ChoiceType
  [Form] fix some type annotations

Author: nicolas-grekas

Application.php

@@ -947,7 +947,7 @@ protected function doRunCommand(Command $command, InputInterface $input, OutputI
             }
         }
 
-        if ($command instanceof SignalableCommandInterface) {
+        if ($command instanceof SignalableCommandInterface && ($this->signalsToDispatchEvent || $command->getSubscribedSignals())) {
             if (!$this->signalRegistry) {
                 throw new RuntimeException('Unable to subscribe to signal events. Make sure that the `pcntl` extension is installed and that "pcntl_*" functions are not disabled by your php.ini\'s "disable_functions" directive.');
             }

Tests/ApplicationTest.php

@@ -37,6 +37,7 @@
 use Symfony\Component\Console\Output\Output;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Output\StreamOutput;
+use Symfony\Component\Console\SignalRegistry\SignalRegistry;
 use Symfony\Component\Console\Tester\ApplicationTester;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\EventDispatcher\EventDispatcher;
@@ -1863,6 +1864,18 @@ public function testSignal()
         $this->assertTrue($command->signaled);
         $this->assertTrue($dispatcherCalled);
     }
+
+    public function testSignalableCommandInterfaceWithoutSignals()
+    {
+        $command = new SignableCommand();
+
+        $dispatcher = new EventDispatcher();
+        $application = new Application();
+        $application->setAutoExit(false);
+        $application->setDispatcher($dispatcher);
+        $application->add($command);
+        $this->assertSame(0, $application->run(new ArrayInput(['signal'])));
+    }
 }
 
 class CustomApplication extends Application
@@ -1930,7 +1943,7 @@ class SignableCommand extends Command implements SignalableCommandInterface
 
     public function getSubscribedSignals(): array
     {
-        return [\SIGALRM];
+        return SignalRegistry::isSupported() ? [\SIGALRM] : [];
     }
 
     public function handleSignal(int $signal): void