Symbol versions for inlined symbols

[Mike Hearn <mike@plan99.net>]

Hi,

One problem with the parallel C++ ABI versioning (which makes it not so
useful) is that symbols in the libstdc++ namespaces are put into the
generated binary if you use the STL. Those generated symbols are *not*
symbol versioned so conflicts can still occur.

This is registered in bugzilla and has been for a while, with no sign of a
fix. So I thought I'd look at it.

Would an acceptable solution be to have a new attribute that set the
symbol version for inlined functions. That way, the STL headers could be
annotated like so:

class XXX
{
	int STD_VERSION std::whatever() { return 4; }
}

An alternative approach would be to have the linker assigned inlined
symbols the same version tag as whatever the same symbol in libstdc++ has,
but I'm not sure how I'd implement this.

Does anybody have insight?

thanks -mike