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Date: Mon, 04 Dec 2017 23:04:00 -0000
From: Jonathan Wakely <jwakely@redhat.com>
To: Ville Voutilainen <ville.voutilainen@gmail.com>
Cc: libstdc++ <libstdc++@gcc.gnu.org>,	"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [v3 PATCH] Implement LWG 2221, No formatted output operator for nullptr
Message-ID: <20171204230424.GA31922@redhat.com>
References: <CAFk2RUa_FkNpgnu3nJw4ZdNnuDx4+tmcM045vuXFhM3pivLp5g@mail.gmail.com>
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X-Clacks-Overhead: GNU Terry Pratchett
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On 03/12/17 23:08 +0200, Ville Voutilainen wrote:
>Tested on Linux-x64.
>
>2017-11-14  Ville Voutilainen  <ville.voutilainen@gmail.com>
>
>    Implement LWG 2221
>    * include/std/ostream (operator<<(nullptr_t)): New.
>    * testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc: New.

>diff --git a/libstdc++-v3/include/std/ostream b/libstdc++-v3/include/std/ostream
>index f7cab03..18011bc 100644
>--- a/libstdc++-v3/include/std/ostream
>+++ b/libstdc++-v3/include/std/ostream
>@@ -245,6 +245,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>       operator<<(const void* __p)
>       { return _M_insert(__p); }
>
>+#if __cplusplus > 201402L
>+      __ostream_type&
>+      operator<<(nullptr_t)
>+      { return *this << "nullptr"; }
>+#endif

As discussed on IRC, this requires a new symbol to be exported for the
std::ostream and std::wostream explicit instantiations, or the new
test will fail to link at -O0.

That should wait for stage 1.