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Re: [Bug-readline] [PATCH] Enable visibility annotations

From: Pedro Alves
Subject: Re: [Bug-readline] [PATCH] Enable visibility annotations
Date: Thu, 14 Apr 2016 11:47:48 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

On 04/14/2016 07:45 AM, Yury Gribov wrote:
> Hi,
> These two patches add visibility annotations to readline's public
> functions and also enable -fvisibility=hidden on platforms where it's
> available.
> This results in 9% size decrease (279K -> 254K) and 45% export symbols
> reduction (655 -> 398) for libreadline on x86_64.
> The autoconf hunk is similar to one that I've recently submitted to
> X.org's libICE, hope there's no licensing problem about this.
> Is this ok for trunk?

FYI, this is probably doing to break (at least) gdb against system 
readline.  gdb relies on accessing a few private readline symbols...  :-/


tui/tui-io.c:437:  extern int _rl_echoing_p;
completer.c:1677:  extern int _rl_complete_mark_directories;
completer.c:1770:extern int _rl_completion_prefix_display_length;
completer.c:1771:extern int _rl_print_completions_horizontally;

Unless/until someone fixes these and adds the missing public APIs
to readline, I think distros will need to either back off this
patch, or build gdb against a static readline, which they'd rather
not (at least Fedora doesn't want that).

We may need a configure option as workaround, or perhaps export
the _rl_foo symbols as well...

Pedro Alves

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