title: What are my available march/mtune options?
body: <p>Is there a way to get gcc to output the available -march=arch options? I'm getting build errors (tried <code>-march=x86_64</code>) and I don't know what my options are.</p>
  
  <p>The compiler I'm using is a proprietary wrapper around gcc that doesn't seem to like <code>-march=skylake</code>. The flags should be the same so I assume whatever options I'd send to gcc to dump architectures would be the same for this wrapper.</p>
  
  <p>I managed to cause gcc to error with a bogus parameter and it dumped a list, but I'm not seeing that now that I'm going through a wrapper.</p>
  
  <p>How can I get gcc to tell me what it supports?</p>