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