From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-380870-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 24747 invoked by alias); 22 Jan 2012 20:40:00 -0000
Received: (qmail 24737 invoked by uid 22791); 22 Jan 2012 20:39:59 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 22 Jan 2012 20:39:47 +0000
From: "basil at list dot ru" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51951] Template function dependent name resolution fails
Date: Sun, 22 Jan 2012 20:57:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: basil at list dot ru
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-51951-4-oAh79uWwhK@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-51951-4@http.gcc.gnu.org/bugzilla/>
References: <bug-51951-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-01/txt/msg02545.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51951

--- Comment #2 from Vasily Sukhanov <basil at list dot ru> 2012-01-22 20:39=
:41 UTC ---
Compilation of attached code fails despite it is accepted by previous GCC
versions.

  1 template <class T>
  2 class Option {
  3 public:
  4   bool m_bValid;
  5   T m_t;
  6 };
  7=20
  8 template<class T>
  9 void readSingle(Option<T>& opt) {
 10     readFromStream(opt.m_bValid);
 11 }
 12=20
 13 template <class T>
 14 void readFromStream(T& t) {  }
 15=20
 16 int main()
 17 {
 18   Option<int> o;
 19   readSingle(o);
 20 }


template_test.cpp: In instantiation of =E2=80=98void readSingle(Option<T>&)=
 [with T =3D
int]=E2=80=99:
template_test.cpp:19:15:   required from here
template_test.cpp:10:5: error: =E2=80=98readFromStream=E2=80=99 was not dec=
lared in this scope,
and no declarations were found by argument-dependent lookup at the point of
instantiation [-fpermissive]
template_test.cpp:14:6: note: =E2=80=98template<class T> void readFromStrea=
m(T&)=E2=80=99
declared here, later in the translation unit

I think that instantiation point of readSingle<int> is line 19. readFromStr=
eam
in line 10 is dependent on template parameter. Therefore compiler should
perform lookup in context of template instantiation (14.6.4.2). readFromStr=
eam
was defined by this point.=20=20
I'm on revision 183301.