Patches for egcs-971016 on AIX

[David Edelsohn]

>>>>> Andrey Slepuhin writes:

Andrey> Sorry, I never thought about such possibility. What about additional
Andrey> linker flag to disable automatic exports?

	Should exporting all global symbols be enabled by default or
disabled by default?  The option can toggle either way.

Andrey> And finally, what about
Andrey> __eh_* symbols? They are global in *every* object file. If I create
Andrey> a shared object from several object files, from which one these symbols
Andrey> will be exported? Moreover, I will receive warnings when linking *any*
Andrey> program, because these symbols are exported in libstdc++. Who can
Andrey> imagine the situation when these symbols are really need to be exported?
Andrey> So, I think I should exclude them from export list until I see such
Andrey> situation.

	We need more input from Mike Stump and Joe Buck and others
involved in the C++ exception handling to understand how these symbols are
used, especially in the AIX environment, and then determine a template or
regex for those that need to be exported.  If all global symbols are
exported, isn't this moot, or are you going to export all symbols *except*
those which may generate duplicate warnings?  The latter is wrong because
most of those duplicate symbols specifically have a common name to be
accessed by programmers to explicitly invoke ctors/dtors in a
runtime-loaded library, for example.

David