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Description of problem:
Calls to `std::uncaught_exception` after calling
`std::rethrow_exception' always return `true' when
`std::uncaught_exception' should return `false' unless an exception is
in flight. `std::rethrow_exception' does not update
`__cxa_eh_globals::uncaughtExceptions' while the following call to
`__cxa_begin_catch' decrements it. This fixes PR 62258.


How reproducible:
Always


Additional info:
PATCH ==> https://gcc.gnu.org/ml/libstdc++/2015-02/msg00005.html


This is a two-line patch that is already fixed upstream.

Affects RHEL 6.7 as well.  Probably introduced here in RHEL6

* Tue Apr 15 2014 Marek Polacek <polacek> 4.4.7-5
- fix std::uncaught_exception (#1085442, PR c++/59224)

as a side-effect since the problem does not manifest with libstdc++-4.4.7-3.

This is an issue when using devtoolset compilers on RHEL6, esp. when using C++11 std::future with exceptions, which uses std::rethrow_exception() to move the exceptions across threads.

The related test passes on all architectures with gcc-4.8.5-14.el7.
VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2094