[libstdc++ PATCH] Add support for std::uncaught_exceptions

[Jonathan Wakely]

On 13/04/15 02:24 +0300, Ville Voutilainen wrote:
>The patch is a bit large since it does the baseline_symbols regeneration
>and other new-version api-dance.
>Hence attached gzipped.
>
>Tested on Linux x86-64.
>
>2015-04-13  Ville Voutilainen  <ville.voutilainen@gmail.com>
>    Add support for std::uncaught_exceptions.
>    * acinclude.m4: Bump libtool_VERSION.
>    * config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Regenerate.
>    * config/abi/pre/gnu.ver: Export the new symbol.
>    * configure: Bump libtool_VERSION.
>    * libsupc++/eh_catch.cc(uncaught_exceptions): New.
>    * libsupc++/exception(uncaught_exceptions): Ditto.
>    * testsuite/18_support/uncaught_exceptions/uncaught_exceptions.cc: New.
>    * testsuite/util/testsuite_abi.cc: Add 3.4.22 as the latest version.

Tested x86_64-linux and powerpc64le-linux. Committed to trunk.

The baseline_symbols changes aren't needed now and I tweaked the
gnu.ver file slightly.

I also added the feature-test macro recommended by N4440 and changed
the new function to only be declared for -std=gnu++?? and -std=c++1z.
It's useful and easy to provide it for pre-C++17 as an extension.
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