[v3] libstdc++/24645

[Paolo Carlini]

Hi,

the below is the long overdue clean-up. Most of it is completely
trivial, besides, maybe a mildly delicate issue in
operator>>(short&/int&), in case num_get throws - the state is bad -
don't try to assign the long to the short/int type + a lot of boring
work on the exports: in the linker script we had very loose patterns for
basic_ostream (compared to basic_istream) and I spent a couple of hours
detailing the various bits @3.4 and checking and re-checking that we are
exporting the new symbols only @3.4.7.

I'm finishing testing the patch and assuming nobody objects probably
will be the first one of the new year! ;)

By the way, happy 2006 to all the libstdc++-v3 friends!

Paolo.

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