Local statics

[Mark Mitchell]

For the most part, the ABI doesn't have to talk about threading.  If,
for example, an implementation doesn't provide a thread-safe
exception-handling mechanism, then that's a limitation of the
implementation, but there's no reason that a library which only
expects there to be a single thread, created with a different
compiler, couldn't be linked with object files generated by the
implementation without thread-safe exception-handling.

However, we do need to decide what, if anything, to do about local
statics with constructors.  As a quality-of-implementation issue,
compilers should ensure that they are constructed only once.  Ensuring
this requires some kind of locking protocol; that requires ABI
standardization.

Or, did we already handle this in some other way?

--
Mark Mitchell                   mark at codesourcery.com
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