m4/sys_select_h.m4

   1 # sys_select_h.m4 serial 3
   2 dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 AC_DEFUN([gl_HEADER_SYS_SELECT],
   8 [
   9   AC_CACHE_CHECK([whether <sys/select.h> is self-contained],
  10     [gl_cv_header_sys_select_h_selfcontained],
  11     [
  12       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/select.h>], [])],
  13         [gl_cv_header_sys_select_h_selfcontained=yes],
  14         [gl_cv_header_sys_select_h_selfcontained=no])
  15     ])
  16   if test $gl_cv_header_sys_select_h_selfcontained = yes; then
  17     SYS_SELECT_H=''
  18   else
  19     SYS_SELECT_H='sys/select.h'
  20     gl_CHECK_NEXT_HEADERS([sys/select.h])
  21     if test $ac_cv_header_sys_select_h = yes; then
  22       HAVE_SYS_SELECT_H=1
  23     else
  24       HAVE_SYS_SELECT_H=0
  25     fi
  26     AC_SUBST([HAVE_SYS_SELECT_H])
  27   fi
  28   AC_SUBST([SYS_SELECT_H])
  29 ])