Re: HEADS-UP: Library version number bumps

From: Thomas Dickey (dickey_at_radix.net)
Date: 09/29/04

  • Next message: Jeremy Chadwick: "Re: installed 5.2.1 can't find LINT" 
    Date: Wed, 29 Sep 2004 13:16:19 -0400
To: freebsd-current@freebsd.org

    On Wed, Sep 29, 2004 at 09:44:22AM -0700, Kris Kennaway wrote:
    >
    > libncurses.so.5 in 5.x does not export many of the global variables
    > exported by 4.x version of libncurses.so.5. The missing symbols are:
    >
    > 23: 0003e270 4 OBJECT GLOBAL DEFAULT 12 SP
    > 166: 0000ee58 26 FUNC GLOBAL DEFAULT 9 _nc_tracebits
    > 170: 00037c0e 2 OBJECT GLOBAL DEFAULT 12 ospeed
    > 175: 00037c2c 4 OBJECT GLOBAL DEFAULT 12 TABSIZE
    > 188: 00036870 4 OBJECT GLOBAL DEFAULT 12 BC
    > 247: 00037744 4 OBJECT GLOBAL DEFAULT 12 COLOR_PAIRS
    > 333: 00037c0c 1 OBJECT GLOBAL DEFAULT 12 PC
    > 370: 00037c1c 4 OBJECT GLOBAL DEFAULT 12 cur_term
    > 406: 00037540 512 OBJECT GLOBAL DEFAULT 12 acs_map
    > 434: 00037748 4 OBJECT GLOBAL DEFAULT 12 COLORS
    > 450: 0003e260 4 OBJECT GLOBAL DEFAULT 12 stdscr
    > 495: 00037c28 4 OBJECT GLOBAL DEFAULT 12 COLS
    > 498: 0003e268 4 OBJECT GLOBAL DEFAULT 12 newscr
    > 515: 0003e264 4 OBJECT GLOBAL DEFAULT 12 curscr
    > 528: 0003686c 4 OBJECT GLOBAL DEFAULT 12 UP
    > 545: 00037c24 4 OBJECT GLOBAL DEFAULT 12 LINES

    Something is going wrong with your script, since most of those are
    well-defined symbols that are present in the normal and wide-character
    libraries. (None are functions, all are variables).

    ** If the script is blameless, then there's a change in the way the
    ** linker builds shared libraries (the point I was trying to establish).

    The wide-character library uses a macro for acs_map (but then, we're not
    talking about that ;-).

    The only other one that is noticeable is the private _nc_tracebits
    symbol (not the topic of this discussion, since applications that use
    private symbols aren't supported by anyone that I recall).

    > A 4.x binary that calls _nc_tracebits() will fail outright when run on
    > 5.x, but this is a debugging function and not likely to be widely used
    > in the real world, so that isn't a big deal.

    _nc_tracebits is a variable, not a function. You can't "call" it.

    Also - checking the changelog - _nc_tracebits was not in ncurses 4.2
    (it was introduced in late 1998).
     
    > However, if a 4.x binary sets one of the other variables in the above
    > list expecting it to have some effect on the library (or vice versa,
    > i.e. expects to read the state of the library by accessing the
    > globals), it will not behave the same way when run on 5.x.
    >
    > If I'm mistaken about the implications (perhaps you can guarantee that
    > the above will not happen), please let us know.
    >
    > Kris 

    -- 
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net

  • Next message: Jeremy Chadwick: "Re: installed 5.2.1 can't find LINT"