Merge pull request 'Update MuParser to version 2.3.2 from 17.06.2020.' (#21)...

Merge pull request 'Update MuParser to version 2.3.2 from 17.06.2020.' (#21) from peters/VirtualFluids_dev:feature/update_muparser into develop

3rdParty/MuParser/samples/example2/Readme.txt

+
+                 __________
+    _____   __ __\______   \_____  _______  ______  ____ _______
+   /     \ |  |  \|     ___/\__  \ \_  __ \/  ___/_/ __ \\_  __ \
+  |  Y Y  \|  |  /|    |     / __ \_|  | \/\___ \ \  ___/ |  | \/
+  |__|_|  /|____/ |____|    (____  /|__|  /____  > \___  >|__|
+        \/                       \/            \/      \/
+
+  Copyright (C) 2004-2020
+  Ingo Berg
+
+
+This sample demonstrates using muParsers C-interface. The C-Interface
+is useful when interfacing muParser from different languages such
+as C#. This sample is intended for use with the MS-Windows OS.
+
+The sample should work with windows and linux.

3rdParty/MuParser/test/t_ParserTest.cpp

+#include "muParserTest.h"
+
+using namespace mu::Test;
+
+int main(int, char**)
+{
+  ParserTester tester;
+  return tester.Run();
+}

CMakeLists.txt

@@ -13,7 +13,8 @@ cmake_minimum_required(VERSION 3.13..3.18 FATAL_ERROR)
 
 project(VirtualFluids CXX)
 
-set (CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 set_property(GLOBAL PROPERTY PREDEFINED_TARGETS_FOLDER ".cmake")