client: Rewrite readline configuration
AX_LIB_READLINE tries to cope with systems where readline lacks history support, or lacks headers, or needs headers included in unorthodox ways. It puts six HAVE_ macros into config.h, and its usage example takes 24 lines of code just to include two headers. Way too complicated for my taste. Replace with new MY_LIB_READLINE, which succeeds only when you have a sane readline, and then defines *one* macro: HAVE_LIBREADLINE. Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
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7 changed files with 35 additions and 140 deletions
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_lib_readline.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_LIB_READLINE
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#
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# DESCRIPTION
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#
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# Searches for a readline compatible library. If found, defines
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# `HAVE_LIBREADLINE'. If the found library has the `add_history' function,
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# sets also `HAVE_READLINE_HISTORY'. Also checks for the locations of the
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# necessary include files and sets `HAVE_READLINE_H' or
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# `HAVE_READLINE_READLINE_H' and `HAVE_READLINE_HISTORY_H' or
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# 'HAVE_HISTORY_H' if the corresponding include files exists.
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#
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# The libraries that may be readline compatible are `libedit',
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# `libeditline' and `libreadline'. Sometimes we need to link a termcap
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# library for readline to work, this macro tests these cases too by trying
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# to link with `libtermcap', `libcurses' or `libncurses' before giving up.
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#
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# Here is an example of how to use the information provided by this macro
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# to perform the necessary includes or declarations in a C file:
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#
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# #ifdef HAVE_LIBREADLINE
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# # if defined(HAVE_READLINE_READLINE_H)
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# # include <readline/readline.h>
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# # elif defined(HAVE_READLINE_H)
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# # include <readline.h>
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# # else /* !defined(HAVE_READLINE_H) */
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# extern char *readline ();
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# # endif /* !defined(HAVE_READLINE_H) */
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# char *cmdline = NULL;
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# #else /* !defined(HAVE_READLINE_READLINE_H) */
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# /* no readline */
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# #endif /* HAVE_LIBREADLINE */
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#
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# #ifdef HAVE_READLINE_HISTORY
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# # if defined(HAVE_READLINE_HISTORY_H)
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# # include <readline/history.h>
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# # elif defined(HAVE_HISTORY_H)
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# # include <history.h>
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# # else /* !defined(HAVE_HISTORY_H) */
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# extern void add_history ();
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# extern int write_history ();
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# extern int read_history ();
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# # endif /* defined(HAVE_READLINE_HISTORY_H) */
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# /* no history */
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# #endif /* HAVE_READLINE_HISTORY */
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#
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# LICENSE
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#
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# Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 6
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AU_ALIAS([VL_LIB_READLINE], [AX_LIB_READLINE])
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AC_DEFUN([AX_LIB_READLINE], [
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AC_CACHE_CHECK([for a readline compatible library],
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ax_cv_lib_readline, [
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ORIG_LIBS="$LIBS"
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for readline_lib in readline edit editline; do
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for termcap_lib in "" termcap curses ncurses; do
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if test -z "$termcap_lib"; then
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TRY_LIB="-l$readline_lib"
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else
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TRY_LIB="-l$readline_lib -l$termcap_lib"
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fi
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LIBS="$ORIG_LIBS $TRY_LIB"
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AC_TRY_LINK_FUNC(readline, ax_cv_lib_readline="$TRY_LIB")
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if test -n "$ax_cv_lib_readline"; then
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break
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fi
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done
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if test -n "$ax_cv_lib_readline"; then
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break
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fi
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done
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if test -z "$ax_cv_lib_readline"; then
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ax_cv_lib_readline="no"
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fi
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LIBS="$ORIG_LIBS"
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])
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if test "$ax_cv_lib_readline" != "no"; then
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LIBS="$LIBS $ax_cv_lib_readline"
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AC_DEFINE(HAVE_LIBREADLINE, 1,
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[Define if you have a readline compatible library])
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AC_CHECK_HEADERS(readline.h readline/readline.h)
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AC_CACHE_CHECK([whether readline supports history],
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ax_cv_lib_readline_history, [
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ax_cv_lib_readline_history="no"
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AC_TRY_LINK_FUNC(add_history, ax_cv_lib_readline_history="yes")
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])
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if test "$ax_cv_lib_readline_history" = "yes"; then
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AC_DEFINE(HAVE_READLINE_HISTORY, 1,
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[Define if your readline library has \`add_history'])
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AC_CHECK_HEADERS(history.h readline/history.h)
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fi
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fi
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])dnl
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25
m4/my_lib_readline.m4
Normal file
25
m4/my_lib_readline.m4
Normal file
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@ -0,0 +1,25 @@
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AC_DEFUN([MY_LIB_READLINE], [
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have_readline=no
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for readline_lib in readline edit editline; do
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for termcap_lib in "" termlib termcap curses ncurses; do
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AC_CHECK_LIB([$readline_lib], [add_history],
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[have_readline=yes; break 2], [], [$termcap_lib])
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done
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done
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if test "$have_readline" = yes; then
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AC_CHECK_HEADER([readline/readline.h], [], [have_readline=no],
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[AC_INCLUDES_DEFAULT])
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AC_CHECK_HEADER([readline/history.h], [], [have_readline=no],
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[AC_INCLUDES_DEFAULT])
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fi
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if test "$have_readline" = yes; then
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if test "x$termcap_lib" != x; then
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LIBS="-l$termcap_lib $LIBS"
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fi
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LIBS="-l$readline_lib $LIBS"
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AC_DEFINE([HAVE_LIBREADLINE], [1],
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[Define if you have libreadline])
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fi
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])
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