[issue1204] readline configuration for shared libs w/o curses dependencies

[Roumen Petrov]

Roumen Petrov <bugtrack at roumenpetrov.info> added the comment:

In the configure{.in} exist another bug:
--------------
AC_CHECK_LIB(readline, readline)
if test "$ac_cv_have_readline_readline" = no
then
  AC_CHECK_LIB(termcap, readline)
fi
--------------
but "grep _readline_readline configure" show that variable in use is
$ac_cv_lib_readline_readline, so the check for function termcap in
readline can be removed safely - it is never reached.

I would like to propose another patch that don't use possible unresolved
symbol to detect presence of library. The new patch will define
HAVE_LIBREADLINE. If necessary will check for dependent library
and link it in correct order. The script print messages like next:
------
checking how to link readline libs... -lreadline -lncursesw
checking for rl_callback_handler_install in -lreadline... yes
checking for rl_pre_input_hook in -lreadline... yes
checking for rl_completion_matches in -lreadline... yes
------

The patch is for branch release25-maint.
It is without changes in configure script, i.e autoconf has to run to
recreate it after applying.
The patch can be applied to trunk as well.

----------
nosy: +rpetrov
Added file: http://bugs.python.org/file11272/python-release25-readline.patch

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