Detect exec failures in compile script, refs #10693

bin/compile

@@ -3,16 +3,28 @@
 
 $cwd = getcwd();
 chdir(__DIR__.'/../');
-$ts = rtrim(shell_exec('git log -n1 --pretty=%ct HEAD'));
+$ts = rtrim(exec('git log -n1 --pretty=%ct HEAD'));
 if (!is_numeric($ts)) {
     echo 'Could not detect date using "git log -n1 --pretty=%ct HEAD"'.PHP_EOL;
     exit(1);
 }
 // Install with the current version to force it having the right ClassLoader version
 // Install without dev packages to clean up the included classmap from phpunit classes
-shell_exec('php bin/composer config autoloader-suffix ComposerPhar' . $ts);
-shell_exec('php bin/composer install -q --no-dev');
-shell_exec('php bin/composer config autoloader-suffix --unset');
+exec('php bin/composer config autoloader-suffix ComposerPhar' . $ts, $output, $result);
+if (0 !== $result) {
+    echo 'Could not set the autoloader suffix, make sure exec is allowed and php can be found in your PATH';
+    exit(1);
+}
+exec('php bin/composer install -q --no-dev', $output, $result);
+if (0 !== $result) {
+    echo 'Could not remove dev deps, make sure exec is allowed and php can be found in your PATH';
+    exit(1);
+}
+exec('php bin/composer config autoloader-suffix --unset', $output, $result);
+if (0 !== $result) {
+    echo 'Could not remove the autoloader suffix, make sure exec is allowed and php can be found in your PATH';
+    exit(1);
+}
 chdir($cwd);
 
 require __DIR__.'/../src/bootstrap.php';