(lp#811386)
* bug fix: using GCC >= 4.6 to build SBCL on x86 no longer breaks
backtraces. (lp#818460)
+ * bug fix: better backtraces for interrupted syscall frames on x86.
+ (lp#549673)
changes in sbcl-1.0.50 relative to sbcl-1.0.49:
* enhancement: errors from FD handlers now provide a restart to remove