Update from gnulib

This incorporates:
2016-09-07 flexmember: new macro FLEXALIGNOF
2016-09-07 flexmember: port better to GCC + valgrind
2016-08-18 Port modules to use getprogname explicitly
2016-09-02 manywarnings: add -fno-common
* admin/merge-gnulib (GNULIB_TOOL_FLAGS): Don’t avoid flexmember,
since time_rz now uses part of it.  Instead, remove m4/flexmember.m4.
* configure.ac (AC_C_FLEXIBLE_ARRAY_MEMBER): Define away,
since Emacs assumes C99 and therefore removes m4/flexmember.m4.
* lib/euidaccess.c, lib/group-member.c, lib/time_rz.c:
* m4/manywarnings.m4: Copy from gnulib.
* lib/flexmember.h: New file, from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/flexmember.h b/lib/flexmember.h
new file mode 100644
index 00000000000..62c556bae25
--- /dev/null
+++ b/lib/flexmember.h
@@ -0,0 +1,42 @@
+/* Sizes of structs with flexible array members.
+
+   Copyright 2016 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   Written by Paul Eggert.  */
+
+#include <stddef.h>
+
+/* Nonzero multiple of alignment of TYPE, suitable for FLEXSIZEOF below.
+   On older platforms without _Alignof, use a pessimistic bound that is
+   safe in practice even if FLEXIBLE_ARRAY_MEMBER is 1.
+   On newer platforms, use _Alignof to get a tighter bound.  */
+
+#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112
+# define FLEXALIGNOF(type) (sizeof (type) & ~ (sizeof (type) - 1))
+#else
+# define FLEXALIGNOF(type) _Alignof (type)
+#endif
+
+/* Upper bound on the size of a struct of type TYPE with a flexible
+   array member named MEMBER that is followed by N bytes of other data.
+   This is not simply sizeof (TYPE) + N, since it may require
+   alignment on unusually picky C11 platforms, and
+   FLEXIBLE_ARRAY_MEMBER may be 1 on pre-C11 platforms.
+   Yield a value less than N if and only if arithmetic overflow occurs.  */
+
+#define FLEXSIZEOF(type, member, n) \
+   ((offsetof (type, member) + FLEXALIGNOF (type) - 1 + (n)) \
+    & ~ (FLEXALIGNOF (type) - 1))