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exporting symbols, help with export list

H. J. Lu hjl@lucon.org
Mon Aug 23 22:54:00 GMT 2004 
On Mon, Aug 23, 2004 at 12:04:50PM -0400, Robert Schweikert wrote:
> The story/questions continue.
> 
> I have managed to get the link time behavior I wanted and also achieved
> one of the runtime goals. At link time I now get errors when a symbols
> is called that is not defined in our export list and runtime of the code
> has significantly improved, the number of relocations is a lot smaller
> than it used to be. So far so good.
> 
> The problem now is that some Exceptions no longer get caught, i.e. they
> migrate to the top and trigger a call to Abort(). At this point I have
> been unable to nail down the difference between exceptions that get
> caught and exceptions that do not get caught.
> 
> I seem to recall reading something about export lists and exceptions
> somewhere but I can no longer locate the information. Thus the question:
> 
> Is there anything special w.r.t. exceptions and using export lists?
> 
> Right now I am using the following format:
> 
> {
> global:
>   symbol1;
>   symbol2;
> ......
> local:
>   symbol_x;
>   symbol_y;
> ....
> };
> 
> My best guess at this point is that exception symbols do not show up in
> either section.
> 

You have to export a few C++ symbols in order to support exceptions.
libstdc++-v3/config/linker-map.gnu in gcc should give you some ideas.


H.J.
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