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diff --git a/extern/mantaflow/preprocessed/general.cpp b/extern/mantaflow/preprocessed/general.cpp
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+
+
+// DO NOT EDIT !
+// This file is generated using the MantaFlow preprocessor (prep generate).
+
+/******************************************************************************
+ *
+ * MantaFlow fluid solver framework
+ * Copyright 2011-2016 Tobias Pfaff, Nils Thuerey
+ *
+ * This program is free software, distributed under the terms of the
+ * Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Globally used macros and functions (e.g. time measurements),
+ * and doxygen documentation collection.
+ *
+ ******************************************************************************/
+
+/*! \mainpage Welcome to mantaflow!
+ *
+ *  Here you can find the auto-generated documentation of the mantaflow framework.
+ *
+ *  One of the most useful parts is probably the list of python functions, classes and the C++
+ * kernels. Those can be found found in the ''Modules'' section. For python functions the
+ * parameters (e.g. Grids, Real or int values) are automatically transferred to and from python.
+ * Thus, this list is a good reference how to call the functions used in the example scenes.
+ *
+ */
+
+// Define plugin documentation group
+// all kernels, plugin functions and classes will automatically be added to this group
+//! @defgroup Plugins Functions callable from Python
+//! @defgroup PyClasses Classes exposed to Python
+//! @defgroup Kernels Computation Kernels
+
+#include "general.h"
+#if defined(WIN32) || defined(_WIN32)
+#  define WIN32_LEAN_AND_MEAN
+#  define NOMINMAX
+#  include <windows.h>
+#  undef WIN32_LEAN_AND_MEAN
+#  undef NOMINMAX
+#else
+#  include <sys/time.h>
+#  include "gitinfo.h"
+#endif
+
+using namespace std;
+
+namespace Manta {
+
+int gDebugLevel = 1;
+
+void MuTime::get()
+{
+#if defined(WIN32) || defined(_WIN32)
+  LARGE_INTEGER liTimerFrequency;
+  QueryPerformanceFrequency(&liTimerFrequency);
+  LARGE_INTEGER liLastTime;
+  QueryPerformanceCounter(&liLastTime);
+  time = (INT)(((double)liLastTime.QuadPart / liTimerFrequency.QuadPart) * 1000);
+#else
+  struct timeval tv;
+  struct timezone tz;
+  tz.tz_minuteswest = 0;
+  tz.tz_dsttime = 0;
+  gettimeofday(&tv, &tz);
+  time = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+#endif
+}
+
+MuTime MuTime::update()
+{
+  MuTime o = *this;
+  get();
+  return *this - o;
+}
+
+string MuTime::toString()
+{
+  stringstream ss;
+  ss << *this;
+  return ss.str();
+}
+
+ostream &operator<<(ostream &os, const MuTime &t)
+{
+  unsigned long ms = (unsigned long)((double)t.time / (60.0 * 1000.0));
+  unsigned long ss = (unsigned long)(((double)t.time / 1000.0) - ((double)ms * 60.0));
+  int ps = (int)(((double)t.time - (double)ss * 1000.0) / 1.0);
+
+  if (ms > 0) {
+    os << ms << "m" << ss << "s";
+  }
+  else {
+    if (ps > 0) {
+      os << ss << ".";
+      if (ps < 10) {
+        os << "0";
+      }
+      if (ps < 100) {
+        os << "0";
+      }
+      os << ps << "s";
+    }
+    else {
+      os << ss << "s";
+    }
+  }
+  return os;
+}
+
+//! print info about this mantaflow build, used eg by printBuildInfo in fluidsolver.cpp
+std::string buildInfoString()
+{
+  std::ostringstream infoStr;
+#ifndef MANTAVERSION
+#  define MANTAVERSION "<unknown-version>"
+#endif
+  infoStr << "mantaflow " << MANTAVERSION;
+
+  // os
+#if defined(WIN32) || defined(_WIN32)
+  infoStr << " win";
+#endif
+#ifdef __APPLE__
+  infoStr << " mac";
+#endif
+#ifdef LINUX
+  infoStr << " linux";
+#endif
+
+  // 32/64 bit
+  if (sizeof(size_t) == 8)
+    infoStr << " 64bit";
+  else
+    infoStr << " 32bit";
+
+    // fp precision
+#if FLOATINGPOINT_PRECISION == 2
+  infoStr << " fp2";
+#else
+  infoStr << " fp1";
+#endif
+
+  // other compile switches
+#ifdef DEBUG
+  infoStr << " debug";
+#endif
+#ifdef OPENMP
+  infoStr << " omp";
+#endif
+
+  // repository info (git commit id)
+#ifndef MANTA_GIT_VERSION
+#  define MANTA_GIT_VERSION "<unknown-commit>"
+#endif
+  infoStr << " " << MANTA_GIT_VERSION;
+
+  infoStr << " from " << __DATE__ << ", " << __TIME__;
+  return infoStr.str();
+}
+
+//! note - generic PYTHON helpers in fluidsolver.cpp , no python bindings here
+
+}  // namespace Manta