Re: [patch] Leave errno unchanged by successful std::stoi etc

[Jonathan Wakely]

commit 502928c8061343e82e982e06299c11d465f64b6c
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Wed Sep 30 14:10:58 2015 +0100

   Save-and-restore errno more carefully in libstdc++

* doc/xml/manual/diagnostics.xml: Document use of errno.

        * config/locale/generic/c_locale.cc (_Save_errno): New helper.
        (__convert_to_v): Use _Save_errno.
        * include/ext/string_conversions.h (__stoa): Only restore errno when
        it isn't set to non-zero.

Committed to trunk.