title: Is there a GSL implementation I can use with GCC 4.9.x?
body: <p>Microsoft's (Core) Guidelines Support Library implementation is said to support GCC 5.1 - but does not specify support for other versions. Higher versions seem to be ok (anyway, 5.3.1 on my Debian Stretch) - but building the tests with GCC 4.9.3 fails.</p>
  
  <ul>
  <li>Has anybody else implemented the GSL?</li>
  <li>Can I use MS GSL anyway, somehow?</li>
  <li>If not, can I use some safe subset of it? (Probably not, I know)</li>
  <li>If not, isn't it a problem that only people with newer compilers can have a guidelines support libraries? Even though their older compilers support C++11 or even C++14?</li>
  </ul>