title: meson cross-file for different platforms
body: <p>In meson you specify a cross-compiler in a cross-file like:</p>
  
  <pre><code>[binaries]
  c = '/opt/yada-yada/gcc/bin/powerpc-yada-yada-gcc'
  </code></pre>
  
  <p>This is great if you know exactly where your compiler is going to live.  If I want to specify the same compiler for Windows, I need a different cross-file like:</p>
  
  <pre><code>[binaries]
  c = 'c:\Program Files (x86)\yada-yada\gcc\bin\powerpc-yada-yada-gcc'
  </code></pre>
  
  <p>Is there a way of using only a single cross-file for both platforms?  I thought <code>find_program</code> might help, but I just get an error about a Malformed value in cross file variable c.</p>