Aha, I think I found -- it's direct binding of
/opt/csw/lib/amd64/libstdc++.so to libc.so.1 for _Unwind_RaiseException
symbol.
$ ./a-4.7
terminate called after throwing an instance of 'std::runtime_error'
terminate called recursively
Abort (core dumped)
$ LD_NODIRECT=1 ./a-4.7
$ echo $?
0
$
And
$ elfdump -y /opt/csw/lib/amd64/libstdc++.so|grep Unwind_RaiseException
[1016] DB [2] libc.so.1 _Unwind_RaiseException
$ elfdump -y /opt/gcc-4.8/lib/amd64/libstdc++.so|grep Unwind_RaiseException
$
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