title: (Where) Does clang document implementation-defined behavior?
body: <p>Implementation-defined behaviors in C are unspecified behaviors for which each conforming implementation must document its choice.</p>
  
  <p>I found such documentations easily for gcc <a href="https://gcc.gnu.org/onlinedocs/gcc-5.3.0/gcc/C-Implementation.html#C-Implementation">here</a> or Microsoft C <a href="https://msdn.microsoft.com/en-us/library/3d61ah0s.aspx">here</a>, but I can't find any such documentation for clang.</p>
  
  <p>Am I searching wrong or is there no such thing?</p>