From: UnixOS2 Archive
To: "UnixOS2 Archive" <UnixOS2_Archive at unixos2.com>
Date: Wed, 16 Oct 2002 04:39:19 EST-10EDT,10,-1,0,7200,3,-1,0,7200,3600
Subject: [UnixOS2_Archive] No. 345

**************************************************
Tuesday 15 October 2002
 Number  345
**************************************************

Subjects for today
 
1  Re:  Autoconf 2.53: wrongly resolved library search : Thomas Dickey <dickey at herndon4.his.com>
2   Autoconf 2.53: wrongly resolved library search : Thomas Hoffmann <thoffman at zappa.sax.de>

**= Email   1 ==========================**

Date:  Wed, 16 Oct 2002 19:41:40 -0400
From:  Thomas Dickey <dickey at herndon4.his.com>
Subject:  Re:  Autoconf 2.53: wrongly resolved library search

On Wed, Oct 16, 2002 at 10:53:39PM +0100, Thomas Hoffmann wrote:
> This is to check for an appearant error in autoconf 2.53 when 
> trying to resolve a cascaded library search:
> 
> A plain library search from a configure.ac like
> 
> AC_PREREQ(2.50)
> AC_INIT([cascadebug], [1.0], [thoffman at zappa.sax.de])
> AC_CHECK_LIB(ncurses, main)
> AC_OUTPUT
> 
> is correctly resolved into the configure sh script.
> 
> But a "cascaded" search as from this configure.ac
> 
> AC_PREREQ(2.50)
> AC_INIT([cascadebug], [1.0], [thoffman at zappa.sax.de])
> AC_PROG_CC
> AC_CHECK_LIB(ncurses, main, [],
>              AC_CHECK_LIB(termcap, main, [],
>                           AC_CHECK_LIB(termlib, main)))

perhaps:

  AC_CHECK_LIB(ncurses, main, [], [
               AC_CHECK_LIB(termcap, main, [],
                            AC_CHECK_LIB(termlib, main))])

> (Just as a side note: all in all autoconf 2.5x makes debugging much
> easier than 2.13, especially by means of readable log files).

I don't find either difficult to read (but 2.53, like 2.51 had too many
initial bug reports for me to bother with).

-- 
Thomas E. Dickey <dickey at invisible-island.net>
http://invisible-island.net
ftp://invisible-island.net

**= Email   2 ==========================**

Date:  Wed, 16 Oct 2002 22:53:39 +0100
From:  Thomas Hoffmann <thoffman at zappa.sax.de>
Subject:   Autoconf 2.53: wrongly resolved library search

This is to check for an appearant error in autoconf 2.53 when 
trying to resolve a cascaded library search:

A plain library search from a configure.ac like

AC_PREREQ(2.50)
AC_INIT([cascadebug], [1.0], [thoffman at zappa.sax.de])
AC_CHECK_LIB(ncurses, main)
AC_OUTPUT

is correctly resolved into the configure sh script.

But a "cascaded" search as from this configure.ac

AC_PREREQ(2.50)
AC_INIT([cascadebug], [1.0], [thoffman at zappa.sax.de])
AC_PROG_CC
AC_CHECK_LIB(ncurses, main, [],
             AC_CHECK_LIB(termcap, main, [],
                          AC_CHECK_LIB(termlib, main)))
AC_OUTPUT

is resolved into a syntactically wrong sh script, basically the lines
around 
(note the LIBS= line!!)

......
if test "${ac_cv_lib_ncurses_main+set}" = set; then
  echo $ECHO_N "(cached) $ECHO_C" >&6
else
  ac_check_lib_save_LIBS=$LIBS
LIBS="-lncurses which can conflict with char main (); below.  */
#include <assert.h>
/* Override any gcc2 internal prototype to avoid an error.  */
.......

Autoconf is:

# autoconf --version
autoconf (GNU Autoconf) 2.53b (release 2 for OS/2)
Written by David J. MacKenzie and Akim Demaille.

Copyright 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.


The shell is:

 at (#)PD KSH v5.2.14 99/07/13.2

Maybe Andreas can look into this?

(Just as a side note: all in all autoconf 2.5x makes debugging much
easier than 2.13, especially by means of readable log files).


-- 
Thomas Hoffmann                                    Telephone:
49-351-4598831
thoffman at zappa.sax.de                                       Dresden,
Germany

..sig under construction ...