--- /dev/null
+# 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])
+])