exporting symbols in shared libraries

exporting symbols in shared libraries

[thomas joseph]

Hi All,
 I have a small question to you.
 Could some body tell me how do I stop exporting
 a symbol in a shared libraries using gcc.

 I do n't want to make it static. Because I need to 
 access it from other files.
 Is there any compiler option/construct to support
 this.

 Thanks in advance,

 best regards,
 --thomas




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Re: exporting symbols in shared libraries

[Fergus Henderson]

On 24-Oct-2002, thomas joseph <thomascanny@yahoo.co.nz> wrote:
> 
> Hi All,
>  I have a small question to you.
>  Could some body tell me how do I stop exporting
>  a symbol in a shared libraries using gcc.
> 
>  I do n't want to make it static. Because I need to 
>  access it from other files.
>  Is there any compiler option/construct to support
>  this.

In the latest (CVS) versions of gcc, you can use the visibility attribute,
e.g. __attribute__((visibility(hidden))).  This only works for ELF targets,
AFAIK.

-- 
Fergus Henderson <fjh@cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.

Re: exporting symbols in shared libraries

[Phil Edwards]

On Thu, Oct 24, 2002 at 10:56:01PM +1300, thomas joseph wrote:
> 
> Hi All,
>  I have a small question to you.
>  Could some body tell me how do I stop exporting
>  a symbol in a shared libraries using gcc.

Usually this is done by the linker, not the compiler.  See your linker's
documentation on symbol maps.

Phil

-- 
I would therefore like to posit that computing's central challenge, viz. "How
not to make a mess of it," has /not/ been met.
                                                 - Edsger Dijkstra, 1930-2002

Re: exporting symbols in shared libraries

[Rayson Ho]

> 
> Hi All,
>  I have a small question to you.
>  Could some body tell me how do I stop exporting
>  a symbol in a shared libraries using gcc.

You can use "version script", or "Linker Mapfile":

http://www.gnu.org/manual/ld-2.9.1/html_node/ld_25.html
http://soldc.sun.com/articles/linker_mapfiles.html

Rayson


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