Couple of new issues in mainline

[Paolo Carlini]

Paolo Carlini wrote:

> Well, maybe the solution for those boring issues is very simple (in 
> principle): use for gnu-linux systems too (besides x86-darwin, per 
> Howard's patch, which, by the way, is approved but still unapplied, 
> I'm going to take care of that), -fvisibility-inlines-hidden! I think 
> that (in principle, again), there are no objections, therefore I'm 
> going to prepare that configury change and check that nothing breaks...

... and something breaks: turns out we have in the ABI baseline quite a 
few inlines, see below. We should analyze this issue more in detail. 
Something I don't fully understand is going on with the std exception 
classes destructors, which are indeed trivial but *not* inline: those 
appear as 'W' in stdexcept.o, but as 't' in the final .so (thus in the 
below). Similarly for ~basic_stringbuf, synthetized by the compiler, it 
appear as 'W' in sstream-inst.o and as 't' in the .so. It looks like 
this 'W' -> 't' change is the visibility fall-out of a link-time 
optimization, which at the moment I don't fully understand (help in 
clarifying this issue would be particularly appreciated)

For reference, I'm also attaching the trivial configure.host change I'm 
using.

Paolo.

///////////

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