title: gcc 4.3.3 compiler options enabled by default
body: <p>I have moved from gcc version 4.0.3 to 4.3.3 and realized that -mfpmath was set to sse by default in gcc 4.3.3. This actually caused errors in my application. 
  In 4.0.3 the -mfpmath was 387.</p>
  
  <p>I want to know how I can get all the default options enabled by gcc for a given version.
  How can I dump set of all options used by gcc while compiling.
  This enables me to compare version 4.0.3 vs 4.3.3.</p>
  
  <p>In general it will be great if I can know a comprehensive list of things need to be checked before going for a version change in gcc .(As this has effect on performance and functionality.)</p>