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#serial 1
dnl From Jim Meyering.
dnl
dnl See if gettimeofday clobbers the static buffer that localtime uses
dnl for it's return value. The gettimeofday function from Mac OS X 10.0.4,
dnl i.e. Darwin 1.3.7 has this problem.
dnl
dnl If it does, then arrange to use gettimeofday only via the wrapper
dnl function that works around the problem.
AC_DEFUN([AC_FUNC_GETTIMEOFDAY_CLOBBER],
[
AC_REQUIRE([AC_HEADER_TIME])
AC_CHECK_HEADERS(string.h stdlib.h)
AC_CACHE_CHECK([whether gettimeofday clobbers localtime buffer],
jm_cv_func_gettimeofday_clobber,
[AC_TRY_RUN([
#include <stdio.h>
#if HAVE_STRING_H
# include <string.h>
#endif
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
int
main ()
{
time_t t = 0;
struct tm *lt;
struct tm saved_lt;
struct timeval tv;
lt = localtime (&t);
saved_lt = *lt;
gettimeofday (&tv, NULL);
if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
exit (1);
exit (0);
}
],
jm_cv_func_gettimeofday_clobber=no,
jm_cv_func_gettimeofday_clobber=yes,
dnl When crosscompiling, assume it is broken.
jm_cv_func_gettimeofday_clobber=yes)
])
if test $jm_cv_func_gettimeofday_clobber = yes; then
AC_LIBOBJ(gettimeofday)
AC_DEFINE(gettimeofday, rpl_gettimeofday,
[Define to rpl_gettimeofday if the replacement function should be used.])
AC_DEFINE(GETTIMEOFDAY_CLOBBERS_LOCALTIME_BUFFER, 1,
[Define if gettimeofday clobbers localtime's static buffer.])
fi
])
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