title: Visual Studio 2019 is configured for:c++17 but it looks more like c++14
body: <p><a href="https://i.stack.imgur.com/F3V3b.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/F3V3b.png" alt="VS2019 Project properties showing c++17" /></a></p>
  <p>If I compile some code with the following:</p>
  <pre><code>#include &lt;string_view&gt;
  
  std::string_view strv{ &quot;Test 1&quot; };
  </code></pre>
  <p>I get this error:</p>
  <pre><code>Error C2065 'string_view': undeclared identifier...
  </code></pre>
  <p>I tried some other c++17 code and not of it works.
  I get the same errors if the C++ Language Standard is set to std:c++14</p>
  <p>The Properties--&gt;C/C++--&gt;Command line contains  /std:c++17
  but the actual compiler command line that runs does not have this option set.</p>
  <p>This is a community version of Visual Studio 2019 version 16.7.1</p>