fix io and fs compile on mac

test=develop

paddle/fluid/framework/device_worker.h

@@ -32,7 +32,7 @@ limitations under the License. */
 #include "paddle/fluid/framework/variable_helper.h"
 #include "paddle/fluid/operators/reader/blocking_queue.h"
 #include "paddle/fluid/platform/place.h"
-#includw "paddle/fluid/platform/port.h"
+#include "paddle/fluid/platform/port.h"
 #include "paddle/fluid/platform/timer.h"
 
 namespace paddle {

paddle/fluid/framework/io/shell.cc

@@ -242,7 +242,7 @@ static int shell_p2open_fork_internal(const char* real_cmd, int pipein_fds[2],
 std::pair<std::shared_ptr<FILE>, std::shared_ptr<FILE>> shell_p2open(
     const std::string& cmd) {
 #if defined _WIN32 || defined __APPLE__
-  return nullptr;
+  return {};
 #else
   if (shell_verbose()) {
     LOG(INFO) << "Opening bidirectional pipe[" << cmd << "]";
@@ -315,7 +315,9 @@ std::string shell_get_command_output(const std::string& cmd) {
       }
     }
   } while (err_no == -1);
+  return "";
 #endif
 }
+
 }  // end namespace framework
 }  // end namespace paddle

paddle/fluid/framework/io/shell.h

@@ -29,6 +29,7 @@
 #include <string>
 #include <utility>
 #include "glog/logging.h"
+#include "paddle/fluid/platform/port.h"
 #include "paddle/fluid/string/string_helper.h"
 
 namespace paddle {

paddle/fluid/framework/trainer.h

@@ -25,12 +25,12 @@ limitations under the License. */
 #include "paddle/fluid/framework/data_set.h"
 #include "paddle/fluid/framework/device_worker.h"
 #include "paddle/fluid/framework/lod_tensor.h"
-#includw "paddle/fluid/platform/port.h"
 #include "paddle/fluid/framework/program_desc.h"
 #include "paddle/fluid/framework/reader.h"
 #include "paddle/fluid/framework/trainer_desc.pb.h"
 #include "paddle/fluid/framework/variable_helper.h"
 #include "paddle/fluid/operators/reader/blocking_queue.h"
+#include "paddle/fluid/platform/port.h"
 
 namespace paddle {
 namespace framework {