Make jni_helpers build on arm32.

talk/app/webrtc/java/jni/jni_helpers.cc

 
 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
@@ skipping 85 matching lines @@
   JNIEnv* jni = nullptr;
   if (jvm->GetEnv(reinterpret_cast<void**>(&jni), JNI_VERSION_1_6) != JNI_OK)
     return -1;
 
   return JNI_VERSION_1_6;
 }
 
 // Return thread ID as a string.
 static std::string GetThreadId() {
   char buf[21];  // Big enough to hold a kuint64max plus terminating NULL.
-  CHECK_LT(snprintf(buf, sizeof(buf), "%ld", syscall(__NR_gettid)),
+  CHECK_LT(snprintf(buf, sizeof(buf), "%ld",
+           static_cast<long>(syscall(__NR_gettid))),
            sizeof(buf))
       << "Thread id is bigger than uint64??";
   return std::string(buf);
 }
 
 // Return the current thread's name.
 static std::string GetThreadName() {
   char name[17] = {0};
   if (prctl(PR_GET_NAME, name) != 0)
     return std::string("<noname>");
@@ skipping 171 matching lines @@
 // callbacks (i.e. entry points that don't originate in a Java callstack
 // through a "native" method call).
 ScopedLocalRefFrame::ScopedLocalRefFrame(JNIEnv* jni) : jni_(jni) {
   CHECK(!jni_->PushLocalFrame(0)) << "Failed to PushLocalFrame";
 }
 ScopedLocalRefFrame::~ScopedLocalRefFrame() {
   jni_->PopLocalFrame(NULL);
 }
 
 }  // namespace webrtc_jni