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# Configure a replacement for <sys/time.h>.
# Copyright (C) 2007 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# Written by Paul Eggert and Martin Lambers.
AC_DEFUN([gl_HEADER_SYS_TIME_H],
[
dnl Use AC_REQUIRE here, so that the REPLACE_GETTIMEOFDAY=0 statement
dnl below is expanded once only, before all REPLACE_GETTIMEOFDAY=1
dnl statements that occur in other macros.
AC_REQUIRE([gl_HEADER_SYS_TIME_H_BODY])
])
AC_DEFUN([gl_HEADER_SYS_TIME_H_BODY],
[
AC_REQUIRE([AC_C_RESTRICT])
AC_CHECK_HEADERS_ONCE([sys/time.h])
if test $ac_cv_header_sys_time_h = yes; then
gl_ABSOLUTE_HEADER([sys/time.h])
ABSOLUTE_SYS_TIME_H=\"$gl_cv_absolute_sys_time_h\"
HAVE_SYS_TIME_H=1
else
ABSOLUTE_SYS_TIME_H=\"no/such/file/sys/time.h\"
HAVE_SYS_TIME_H=0
fi
AC_SUBST([ABSOLUTE_SYS_TIME_H])
AC_SUBST([HAVE_SYS_TIME_H])
AC_CACHE_CHECK([for struct timeval], [gl_cv_sys_struct_timeval],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>
]],
[[static struct timeval x; x.tv_sec = x.tv_usec;]])],
[gl_cv_sys_struct_timeval=yes],
[gl_cv_sys_struct_timeval=no])])
if test $gl_cv_sys_struct_timeval = yes; then
HAVE_STRUCT_TIMEVAL=1
else
HAVE_STRUCT_TIMEVAL=0
fi
AC_SUBST([HAVE_STRUCT_TIMEVAL])
dnl Assume POSIX behavior unless another module says otherwise.
REPLACE_GETTIMEOFDAY=0
AC_SUBST([REPLACE_GETTIMEOFDAY])
if test $HAVE_SYS_TIME_H = 0 || test $HAVE_STRUCT_TIMEVAL = 0; then
SYS_TIME_H=sys/time.h
else
SYS_TIME_H=
fi
AC_SUBST([SYS_TIME_H])
])
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