Re: Need help with autoconf configure script

[Bob Rossi]

Hi all,

Sorry to reply to my own Email, but I have more info, and with this I'm
hopeing someone could solve the last piece of the puzzle.

To recap, look at the if/else below(in original Email). When I go into the 
top part of the if statement, VL_LIB_READLINE isn't ever called. However, 
my configure script is still corrupted even though VL_LIB_READLINE isn't 
executed. If I take out the VL_LIB_READLINE everything works fine.

I've commented lines out of the VL_LIB_READLINE macro and found the lines 
that are breaking the configure script for me.
  if test "$vl_cv_lib_readline" != "no"; then
    AC_DEFINE(HAVE_LIBREADLINE, 1,
              [Define if you have a readline compatible library])
dnl    AC_CHECK_HEADERS(readline.h readline/readline.h)
    AC_CACHE_CHECK([whether readline supports history],
                   vl_cv_lib_readline_history, [
      vl_cv_lib_readline_history="no"
      AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")
    ])
    if test "$vl_cv_lib_readline_history" = "yes"; then
      AC_DEFINE(HAVE_READLINE_HISTORY, 1,
                [Define if your readline library has \`add_history'])
dnl      AC_CHECK_HEADERS(history.h readline/history.h)
    fi
  fi

The 2 lines commentted out above (AC_CHECK_HEADERS) are causing
VL_LIB_READLINE to break the configure script, even though those lines
are never executed. Does anyone understand how this could happen?
I am at a loss and really need some help.

Thanks,
Bob Rossi


On Tue, Jul 12, 2005 at 09:32:56AM -0400, Bob Rossi wrote:
> Hi again,
> 
> I'm still trying to get CGDB working with autoconf. I've got a very
> strange problem. I have this in my configure.in,
> 
>    if test "$opt_with_readline_prefix" = "no"; then
>    echo "READLINE_PREFIX=NO"
>    else
>    echo "READLINE_PREFIX=YES"
>    VL_LIB_READLINE
>    fi
> 
> I downloaded VL_LIB_READLINE from here,
>   http://autoconf-archive.cryp.to/vl_lib_readline.html
> although I have modified it slightly (see attachment).
> 
> If I run ./configure then by default opt_with_readline_prefix is "no".
> During ../cgdb/configure I get,
>    checking pty.h usability... yes
>    checking pty.h presence... no
>    configure: WARNING: pty.h: accepted by the compiler, rejected by the 
> preprocessor!
>    configure: WARNING: pty.h: proceeding with the compiler's result
>    checking for pty.h... yes
> so I get error's when VL_LIB_READLINE is *not* run.
> 
> If I run ../cgdb/configure --with-readline, then
> opt_with_readline_prefix is not "no". This causes VL_LIB_READLINE to
> run. When this happens, I get,
> 
>    checking pty.h usability... yes
>    checking pty.h presence... yes
>    checking for pty.h... yes
> 
> I can't figure out why I'm getting error's when VL_LIB_READLINE is not
> run. Any help would be greatly appreciated. I've attached the slightly
> modified version of VL_LIB_READLINE that I am using.
> 
> Thanks,
> Bob Rossi

> dnl Available from the GNU Autoconf Macro Archive at:
> dnl http://www.gnu.org/software/ac-archive/htmldoc/vl_lib_readline.html
> dnl
> AC_DEFUN([VL_LIB_READLINE], [
>   AC_CACHE_CHECK([for a readline compatible library],
>                  vl_cv_lib_readline, [
>     ORIG_LIBS="$LIBS"
>     for readline_lib in readline; do
>       for termcap_lib in "" termcap ncurses curses; do
>         if test -z "$termcap_lib"; then
>           TRY_LIB="-l$readline_lib"
>         else
>           TRY_LIB="-l$readline_lib -l$termcap_lib"
>         fi
>         LIBS="$ORIG_LIBS $TRY_LIB"
>         AC_TRY_LINK_FUNC(readline, vl_cv_lib_readline="$TRY_LIB")
>         if test -n "$vl_cv_lib_readline"; then
>           break
>         fi
>       done
>       if test -n "$vl_cv_lib_readline"; then
>         break
>       fi
>     done
>     if test -z "$vl_cv_lib_readline"; then
>       vl_cv_lib_readline="no"
>       LIBS="$ORIG_LIBS"
>     fi
>   ])
> 
>   have_readline=no
>   if test "$vl_cv_lib_readline" != "no"; then
>     have_readline=yes
>     AC_DEFINE(HAVE_LIBREADLINE, 1,
>               [Define if you have a readline compatible library])
>     AC_CHECK_HEADERS(readline.h readline/readline.h)
>     AC_CACHE_CHECK([whether readline supports history],
>                    vl_cv_lib_readline_history, [
>       vl_cv_lib_readline_history="no"
>       AC_TRY_LINK_FUNC(add_history, vl_cv_lib_readline_history="yes")
>     ])
>     have_history=no
>     if test "$vl_cv_lib_readline_history" = "yes"; then
>       have_history=yes
>       AC_DEFINE(HAVE_READLINE_HISTORY, 1,
>                 [Define if your readline library has \`add_history'])
>       AC_CHECK_HEADERS(history.h readline/history.h)
>     fi
>   fi
> 
> dnl Here we need to quit if there is no readline available
>     if test $have_readline = no; then
>         AC_MSG_ERROR([   *****************************************************
>                      cgdb requires the GNU readline library to link!
>                      *****************************************************])
>     fi
> 
> dnl Here we need to quit if there is no history available
>     if test $have_history = no; then
>         AC_MSG_ERROR([   *****************************************************
>                      cgdb requires the GNU readline history library to link!
>                      *****************************************************])
>     fi
> ])dnl

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