title: linker issues in VSCode
body: <p>so I am sort of new to using VSCode, decided to do a switch from eclipse to vscode since it look more appealing to the eyes. So I have been following some setup videos and I have been running into this linker issue and cannot seem to get it fix, so here i am asking for some guidance. Thanks in advance. Here is the error output:</p>
  <pre class="lang-none prettyprint-override"><code>rgmac@MacBook-Pro trst % cd &quot;/Users/rgmac/Desktop/VScode/c++ws/trst/&quot; &amp;&amp; g++ t.cpp -o t &amp;&amp; &quot;/Users/rgmac/Desktop/VScode/c++ws/trst/&quot;t
  Undefined symbols for architecture x86_64:
    &quot;_main&quot;, referenced from:
       implicit entry/start for main executable
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>