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What's new:
-----------
- New open(2) flags O_TMPFILE and O_NOATIME.
- scanf/wscanf now handle the POSIX %m modifier.
- scanf now handles the %l[ conversion.
- Improved hostprogs compatibility for cross-compiling the Linux kernel.
New headers: <asm/bitsperlong.h>, <asm/posix_types.h>.
- Built-in implementation of Stack Smashing Protection compiler feature.
New APIs: __stack_chk_fail, __stack_chk_guard.
- Built-in implementation of _FORTIFY_SOURCE guards for functions in
<stdio.h>, <stdlib.h>, <string.h>, <strings.h>, <unistd.h>, <wchar.h>,
<sys/poll.h>, and <sys/socket.h>.
New APIs: __chk_fail, __gets_chk, __memcpy_chk, __memmove_chk, __mempcpy_chk,
__memset_chk, __snprintf_chk, __sprintf_chk, __stpcpy_chk, __stpncpy_chk,
__strcat_chk, __strcpy_chk, __strncat_chk, __strncpy_chk, __vsnprintf_chk,
__vsprintf_chk.
- Built-in implementation of POSIX.1-2001 message catalog support.
New APIs: catclose, catgets, catopen. New tool: gencat.
- New APIs: sigtimedwait, wmempcpy.
What changed:
-------------
- Standard headers no longer use macros to support K&R C.
- confstr(3) and getconf(1) accept LFS_CFLAGS, LFS_LDFLAGS, etc.
- The __always_inline and __nonnull macros in <sys/cdefs.h> are now
compatible with glibc.
- Feature Test Macros improvements in <fcntl.h>, <limits.h>, <netdb.h>,
<strings.h>, and <unistd.h>.
Bug Fixes
---------
- Fix a problem in unlink on NFS.
Addresses: Shows up in GAWK testsuite test "testext"
- Fix errno setting bug in posix_fadvise and posix_fallocate.
Addresses: https://cygwin.com/ml/cygwin-patches/2017-q4/msg00026.html
- Fix two bugs in the limit of large numbers of sockets.
Addresses: https://cygwin.com/ml/cygwin/2017-11/msg00052.html
- Fix a fork failure with private anonymous mmaps.
Addresses: https://cygwin.com/ml/cygwin/2017-12/msg00061.html
- Remove a call to fflush from ftell{o}, which may result in wrong offsets.
Addresses: https://cygwin.com/ml/cygwin/2017-12/msg00151.html
- Fix file pointer computation after short writes on block devices.
Addresses: https://cygwin.com/ml/cygwin/2017-12/msg00151.html
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