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dnl Check:
dnl * If we have gettimeofday;
dnl * If we have struct timezone for use in calling it;
dnl * If calling it with a timezone pointer actually works -- this is deemed
dnl obsolete or undefined on some systems which say you should use a null
dnl pointer -- and undefine HAVE_TIMEZONE if so;
dnl * Whether it only takes one arg.
AC_DEFUN(LIBU77_GETTIMEOFDAY, [
AC_CHECK_FUNCS(gettimeofday)
if test "$ac_cv_func_gettimeofday" = yes; then
AC_CACHE_CHECK([for struct timezone], g77_cv_struct_timezone,
[AC_TRY_COMPILE([#include <sys/time.h>],
[struct timezone tz;],
g77_cv_struct_timezone=yes, g77_cv_struct_timezone=no)])
if test $g77_cv_struct_timezone = yes; then
dnl It may be that we can't call gettimeofday with a non-null pointer.
dnl In that case we'll lie about struct timezone.
AC_TRY_RUN([
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
main ()
{
struct timeval time;
struct timezone dummy;
if (gettimeofday (&time, &dummy))
exit (1);
else
exit (0);
}],
[AC_DEFINE(HAVE_TIMEZONE)], ,[AC_DEFINE(HAVE_TIMEZONE)])
fi
AC_REQUIRE([AC_HEADER_TIME])
AC_CACHE_CHECK(whether gettimeofday can accept two arguments,
emacs_cv_gettimeofday_two_arguments,
AC_TRY_LINK([
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
],
[
struct timeval time;
#ifdef HAVE_TIMEZONE
struct timezone dummy;
#define DUMMY &dummy
#else
#define DUMMY NULL
#endif
gettimeofday (&time, DUMMY);],
emacs_cv_gettimeofday_two_arguments=yes,
emacs_cv_gettimeofday_two_arguments=no))
if test $emacs_cv_gettimeofday_two_arguments = no; then
AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT)
fi
fi])
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