What's new:
-----------

- New APIs: clearenv, pthread_tryjoin_np, pthread_timedjoin_np,
  sched_getcpu.

- New APIs: aio_cancel, aio_error, aio_fsync, aio_read, aio_return,
  aio_suspend, aio_write, lio_listio.
  New header: <aio.h>.


What changed:
-------------

- SO_RCVTIMEO and SO_SNDTIMEO socket options are now honored.

- /proc/cpuinfo now reports L3 cache size on Intel CPUs.

- Drop denormal-operand exception from FE_ALL_EXCEPT, as on Linux.


Bug Fixes
---------

- Fix utils path handling in case cygdrive path is just '/'.
  Addresses: https://cygwin.com/ml/cygwin/2018-02/msg00174.html

- Fix a potential SIGFPE in strtod, if FE_INVALID exceptions are
  enabled.
  Addresses: https://cygwin.com/ml/cygwin/2018-04/msg00055.html

- Fix a CPU affinity problem when creating /proc/cpuinfo output.
  Addresses: https://cygwin.com/ml/cygwin/2018-04/msg00118.html

- Fix a buffer underrun problem in Win32 path normalization.
  Addresses: https://cygwin.com/ml/cygwin/2018-05//msg00017.html

- Fix a stack alignment problem which may lead to spurious crashes after
  fork.
  Addresses: https://cygwin.com/ml/cygwin-patches/2018-q2/msg00016.html

- Fix a g++ compilation problem with -std=c++14 or -std=c++17.
  Addresses: https://cygwin.com/ml/cygwin/2018-05/msg00316.html

- Fix FPE flag handling for division by zero conditions
  Addresses: https://cygwin.com/ml/cygwin/2018-06/msg00281.html

- Fix Unicode table.
  Addresses: https://cygwin.com/ml/cygwin/2018-06/msg00248.html

- Handle a non-standard return value from some tape drives to
  report a "no-media" error.
  Addresses: https://cygwin.com/ml/cygwin/2018-06/msg00245.html

- Fix duration handling in sigtimedwait
  Addresses: https://cygwin.com/ml/cygwin-patches/2018-q3/msg00018.html

- Make FP environment symbols available on x86_64.
  Addresses: https://cygwin.com/ml/cygwin/2018-07/msg00183.html

- Fix fegetenv behaviour.
  Addresses: https://cygwin.com/ml/cygwin/2018-08/msg00000.html