title: Eclipse CDT not building fresh project of certain name
body: <p>I've a C++ project in Eclipse CDT called <code>agos</code> with about 50 source files. The problem is that it doesn't build anymore. Eclipse reports that it built:</p>
  
  <pre><code>15:23:28 **** Build of configuration Debug for project agos ****
  make all 
  make: Nothing to be done for `all'.
  
  15:23:28 Build Finished (took 59ms)
  </code></pre>
  
  <p>However, the built time is way too short and there are no <code>.o</code> files and no executable anywhere under the project directory after building.</p>
  
  <p>To rebuild, I've tried this:</p>
  
  <p>1.)</p>
  
  <ul>
  <li>have switched on <code>Build Automatically</code></li>
  <li>choose <code>Project &gt; Clean...</code></li>
  <li>result: only clean is reported; build is not done and not reported</li>
  </ul>
  
  <p>2.)</p>
  
  <ul>
  <li>switch off <code>Build Automatically</code></li>
  <li>choose <code>Project &gt; Clean...</code> (and have <code>Start a build immediately</code> ticked)</li>
  <li>result: build is reported as above, but not done</li>
  </ul>
  
  <p>3.)</p>
  
  <ul>
  <li>keep <code>Build Automatically</code> switched off</li>
  <li>choose <code>Project &gt; Clean...</code> (and have <code>Start a build immediately</code> unticked)</li>
  <li>choose <code>Project &gt; Build Project</code></li>
  <li>result: build is reported as above, but not done</li>
  </ul>
  
  <p>Now the mysterious thing: Another project with the same content compiles fine:  </p>
  
  <p>When I create another C++ project (let's call it <code>foo</code>) and copy 
  all source files from <code>agos</code> to <code>foo</code>, then <code>foo</code> builds just fine. When I delete <code>agos</code> and all its files on disk (I've checked that they the project folder gets deleted), restart Eclipse, and create <code>agos</code> again and copy all the files back from <code>foo</code> to <code>agos</code>, then <code>agos</code> still doesn't build and <code>foo</code> still builds fine.</p>
  
  <p>I'm using<br>
  - Ubuntu 14.04 (64bit)<br>
  - Eclipse IDE for C/C++ Developers<br>
  - Eclipse Mars Release (4.5.0), Build id: 20150621-1200  </p>
  
  <p>I have kept Eclipse CDT as the bundle is after download and I did not install any additional plugins.</p>