1999-10-12 16:39:35 +08:00
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dnl Check:
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dnl * If we have gettimeofday;
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dnl * If we have struct timezone for use in calling it;
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dnl * If calling it with a timezone pointer actually works -- this is deemed
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dnl obsolete or undefined on some systems which say you should use a null
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dnl pointer -- and undefine HAVE_TIMEZONE if so;
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dnl * Whether it only takes one arg.
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AC_DEFUN(LIBU77_GETTIMEOFDAY, [
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AC_CHECK_FUNCS(gettimeofday)
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if test "$ac_cv_func_gettimeofday" = yes; then
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AC_CACHE_CHECK([for struct timezone], g77_cv_struct_timezone,
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[AC_TRY_COMPILE([#include <sys/time.h>],
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[struct timezone tz;],
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g77_cv_struct_timezone=yes, g77_cv_struct_timezone=no)])
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if test $g77_cv_struct_timezone = yes; then
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dnl It may be that we can't call gettimeofday with a non-null pointer.
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dnl In that case we'll lie about struct timezone.
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AC_TRY_RUN([
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#endif
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main ()
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{
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struct timeval time;
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struct timezone dummy;
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if (gettimeofday (&time, &dummy))
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exit (1);
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else
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exit (0);
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}],
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[AC_DEFINE(HAVE_TIMEZONE)], ,[AC_DEFINE(HAVE_TIMEZONE)])
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fi
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AC_REQUIRE([AC_HEADER_TIME])
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AC_CACHE_CHECK(whether gettimeofday can accept two arguments,
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emacs_cv_gettimeofday_two_arguments,
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AC_TRY_LINK([
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <time.h>
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#endif
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#endif
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],
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[
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struct timeval time;
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struct timezone dummy;
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gettimeofday (&time, &dummy);],
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emacs_cv_gettimeofday_two_arguments=yes,
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emacs_cv_gettimeofday_two_arguments=no))
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if test $emacs_cv_gettimeofday_two_arguments = no; then
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AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT)
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fi
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fi])
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