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emacs/m4/utimens.m4
Paul Eggert 846657afaf Update from Gnulib
This incorporates:
2020-08-16 time_rz: remove unused functions
2020-08-16 time_rz: fix issues with mktime_z failures
2020-08-16 nstrftime: Guide inlining also on clang
2020-08-16 intprops: Avoid bogus warning on clang
2020-08-16 libc-config: Enable __REDIRECT macro also on clang
2020-08-16 regex: Use initializer shorthand syntax also with clang
2020-08-16 regex: Use space optimization also with clang
2020-08-16 Use _Static_assert and static_assert when present on clang
2020-08-16 Use 'throw ()' for optimization in C++ mode also on clang
2020-08-16 stdio: Don't break attribute 'scanf' on clang
2020-08-16 Fix "warning: 'format' attribute ...: rpl_printf"
2020-08-16 Fix "warning: attribute declaration must precede definition"
2020-08-16 Fix undesired warnings
2020-08-16 Don't use Autoconf quadrigraphsxo
2020-08-16 Fix quoting of AC_LANG_PROGRAM arguments
2020-08-16 Assume autoconf >= 2.64
2020-08-15 nstrftime: be more predictable about errno
2020-08-15 canonicalize: Fix autoconf test on MSVC/clang
2020-08-15 Support compiling without -loldnames on native Windows
2020-08-14 mktime, mktime-internal: Remove obsolete code
2020-08-14 Assume tzset exists
* lib/c++defs.h, lib/canonicalize-lgpl.c, lib/cdefs.h, lib/dup2.c:
* lib/fcntl.in.h, lib/getopt-cdefs.in.h, lib/intprops.h, lib/md5.h:
* lib/mktime.c, lib/nstrftime.c, lib/open.c, lib/regcomp.c:
* lib/regex_internal.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/strftime.h, lib/string.in.h, lib/sys_select.in.h:
* lib/sys_stat.in.h, lib/sys_time.in.h, lib/time.in.h, lib/time_rz.c:
* lib/unistd.in.h, lib/verify.h, m4/00gnulib.m4:
* m4/absolute-header.m4, m4/alloca.m4, m4/canonicalize.m4, m4/dup2.m4:
* m4/fchmodat.m4, m4/fcntl.m4, m4/fdopendir.m4, m4/fpending.m4:
* m4/futimens.m4, m4/getdtablesize.m4, m4/getloadavg.m4:
* m4/gnulib-common.m4, m4/include_next.m4, m4/largefile.m4:
* m4/manywarnings.m4, m4/mktime.m4, m4/nstrftime.m4, m4/open-slash.m4:
* m4/pselect.m4, m4/pthread_sigmask.m4, m4/time_h.m4, m4/utimens.m4:
* m4/utimensat.m4, m4/utimes.m4, m4/warnings.m4:
Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.
2020-08-16 14:30:29 -07:00

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dnl Copyright (C) 2003-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl serial 11
AC_DEFUN([gl_UTIMENS],
[
dnl Prerequisites of lib/utimens.c.
AC_REQUIRE([gl_FUNC_UTIMES])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([futimes futimesat futimens utimensat lutimes])
if test $ac_cv_func_futimens = no && test $ac_cv_func_futimesat = yes; then
dnl FreeBSD 8.0-rc2 mishandles futimesat(fd,NULL,time). It is not
dnl standardized, but Solaris implemented it first and uses it as
dnl its only means to set fd time.
AC_CACHE_CHECK([whether futimesat handles NULL file],
[gl_cv_func_futimesat_works],
[touch conftest.file
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stddef.h>
#include <sys/times.h>
#include <fcntl.h>
]GL_MDA_DEFINES],
[[int fd = open ("conftest.file", O_RDWR);
if (fd < 0) return 1;
if (futimesat (fd, NULL, NULL)) return 2;
]])],
[gl_cv_func_futimesat_works=yes],
[gl_cv_func_futimesat_works=no],
[case "$host_os" in
# Guess yes on Linux systems.
linux-* | linux) gl_cv_func_futimesat_works="guessing yes" ;;
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_futimesat_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_futimesat_works="$gl_cross_guess_normal" ;;
esac
])
rm -f conftest.file])
case "$gl_cv_func_futimesat_works" in
*yes) ;;
*)
AC_DEFINE([FUTIMESAT_NULL_BUG], [1],
[Define to 1 if futimesat mishandles a NULL file name.])
;;
esac
fi
])