Fixes issue 29539 with the workaround of initializing libnotify early by calling localtime_r in OS:…

runtime/vm/os_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(HOST_OS_MACOS)
 
 #include "vm/os.h"
 
 #include <errno.h>           // NOLINT
@@ skipping 405 matching lines @@
 }
 
 
 void OS::InitOnce() {
   // TODO(5411554): For now we check that initonce is called only once,
   // Once there is more formal mechanism to call InitOnce we can move
   // this check there.
   static bool init_once_called = false;
   ASSERT(init_once_called == false);
   init_once_called = true;
+
+  // See https://github.com/dart-lang/sdk/issues/29539
+  // This is a workaround for a macos bug, we eagerly call localtime_r so that
+  // libnotify is initialized early before any fork happens.
+  struct timeval tv;
+  if (gettimeofday(&tv, NULL) < 0) {
+    FATAL1("gettimeofday returned an error (%s)\n", strerror(errno));
+    return;
+  }
+  tm decomposed;
+  struct tm* error_code = localtime_r(&(tv.tv_sec), &decomposed);
+  if (error_code == NULL) {
+    FATAL1("localtime_r returned an error (%s)\n", strerror(errno));
+    return;
+  }
 }
 
 
 void OS::Shutdown() {}
 
 
 void OS::Abort() {
   abort();
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(HOST_OS_MACOS)