readline/examples/autoconf/wi_LIB_READLINE

   1 dnl Borut Razem
   2 dnl
   3 dnl This macro checks for the presence of the readline library.
   4 dnl It works also in cross-compilation environment.
   5 dnl
   6 dnl To get it into the aclocal.m4 dnl file, do this:
   7 dnl   aclocal -I . --verbose
   8 dnl
   9 dnl The --verbose will show all of the files that are searched
  10 dnl for .m4 macros.
  11
  12 AC_DEFUN([wi_LIB_READLINE], [
  13   dnl check for the readline.h header file
  14
  15   AC_CHECK_HEADER(readline/readline.h)
  16
  17   if test "$ac_cv_header_readline_readline_h" = yes; then
  18     dnl check the readline version
  19
  20     cat > conftest.$ac_ext <<EOF
  21 #include <stdio.h>
  22 #include <readline/readline.h>
  23 wi_LIB_READLINE_VERSION RL_VERSION_MAJOR RL_VERSION_MINOR
  24 EOF
  25
  26     wi_READLINE_VERSION=$($CPP $CPPFLAGS conftest.$ac_ext | sed -n -e "s/^wi_LIB_READLINE_VERSION  *\([[0-9\]][[0-9\]]*\)  *\([[0-9\]][[0-9\]]*\)$/\1.\2/p")
  27     rm -rf conftest*
  28
  29     if test -n "$wi_READLINE_VERSION"; then
  30       wi_MAJOR=$(expr $wi_READLINE_VERSION : '\([[0-9]][[0-9]]*\)\.')
  31       wi_MINOR=$(expr $wi_READLINE_VERSION : '[[0-9]][[0-9]]*\.\([[0-9]][[0-9]]*$\)')
  32       if test $wi_MINOR -lt 10; then
  33         wi_MINOR=$(expr $wi_MINOR \* 10)
  34       fi
  35       wi_READLINE_VERSION=$(expr $wi_MAJOR \* 100 + $wi_MINOR)
  36     else
  37       wi_READLINE_VERSION=-1
  38     fi
  39
  40     dnl check for the readline library
  41
  42     ac_save_LIBS="$LIBS"
  43     # Note: $LIBCURSES is permitted to be empty.
  44
  45     for LIBREADLINE in "-lreadline.dll" "-lreadline" "-lreadline $LIBCURSES" "-lreadline -ltermcap" "-lreadline -lncurses" "-lreadline -lcurses"
  46     do
  47       AC_MSG_CHECKING([for GNU Readline library $LIBREADLINE])
  48
  49       LIBS="$ac_save_LIBS $LIBREADLINE"
  50
  51       AC_TRY_LINK([
  52         /* includes */
  53         #include <stdio.h>
  54         #include <readline/readline.h>
  55       ],[
  56         /* function-body */
  57         int dummy = rl_completion_append_character; /* rl_completion_append_character appeared in version 2.1 */
  58         readline(NULL);
  59       ],[
  60         wi_cv_lib_readline=yes
  61         AC_MSG_RESULT(yes)
  62       ],[
  63         wi_cv_lib_readline=no
  64         AC_MSG_RESULT(no)
  65       ])
  66
  67       if test "$wi_cv_lib_readline" = yes; then
  68         AC_SUBST(LIBREADLINE)
  69         AC_DEFINE_UNQUOTED(HAVE_LIBREADLINE, $wi_READLINE_VERSION, [Readline])
  70         break
  71       fi
  72     done
  73
  74     LIBS="$ac_save_LIBS"
  75   fi
  76 ])