Bug with relative searches after including about csol

[nielssp]

Thank you for reporting this. It definitely looks like dirname is the culprit. The way the function is described makes it a bit of a footgun:

   Both dirname() and basename() may modify the contents of  path,  so  it
   may be desirable to pass a copy when calling one of these functions.

   These  functions  may  return  pointers  to statically allocated memory
   which may be overwritten by subsequent calls.  Alternatively, they  may
   return  a  pointer to some part of path, so that the string referred to
   by path should not be modified or freed until the pointer  returned  by
   the function is no longer required.

It should be fixed now in master.