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# utime.m4 serial 5
dnl Copyright (C) 2017-2024 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.
AC_DEFUN([gl_FUNC_UTIME],
[
AC_REQUIRE([gl_UTIME_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CHECK_FUNCS_ONCE([lstat])
case "$host_os" in
mingw* | windows*)
dnl On this platform, the original utime() or _utime() produces
dnl timestamps that are affected by the time zone.
dnl Use the function name 'rpl_utime' always, in order to avoid a
dnl possible conflict with the function name 'utime' from oldnames.lib
dnl (MSVC) or liboldnames.a (mingw).
REPLACE_UTIME=1
;;
*)
AC_CHECK_FUNCS([utime])
if test $ac_cv_func_utime = no; then
HAVE_UTIME=0
else
dnl On macOS 10.13, utime("link-to-file/", NULL) mistakenly succeeds.
AC_CACHE_CHECK([whether utime handles trailing slashes on files],
[gl_cv_func_utime_file_slash],
[touch conftest.tmp
# Assume that if we have lstat, we can also check symlinks.
if test $ac_cv_func_lstat = yes; then
ln -s conftest.tmp conftest.lnk
fi
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stddef.h>
#include <utime.h>
]],
[[int result = 0;
if (!utime ("conftest.tmp/", NULL))
result |= 1;
#if HAVE_LSTAT
if (!utime ("conftest.lnk/", NULL))
result |= 2;
#endif
return result;
]])],
[gl_cv_func_utime_file_slash=yes],
[gl_cv_func_utime_file_slash=no],
[case "$host_os" in
# Guess yes on Linux systems.
linux-* | linux) gl_cv_func_utime_file_slash="guessing yes" ;;
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_utime_file_slash="guessing yes" ;;
# Guess no on macOS.
darwin*) gl_cv_func_utime_file_slash="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_utime_file_slash="$gl_cross_guess_normal" ;;
esac
])
rm -f conftest.tmp conftest.lnk
])
case $gl_cv_func_stat_file_slash in
*no)
REPLACE_UTIME=1
AC_DEFINE([REPLACE_FUNC_UTIME_FILE], [1],
[Define to 1 if utime needs help when passed a file name with a trailing slash])
;;
esac
fi
;;
esac
])
# Prerequisites of lib/utime.c.
AC_DEFUN([gl_PREREQ_UTIME], [:])
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