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* Re: c++/3084: anonymous namespace linking
@ 2001-06-08 6:26 Artem Khodush
0 siblings, 0 replies; 3+ messages in thread
From: Artem Khodush @ 2001-06-08 6:26 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/3084; it has been noted by GNATS.
From: "Artem Khodush" <artem@duma.gov.ru>
To: <conversy@emn.fr>
Cc: <gcc-gnats@gcc.gnu.org>, <gcc-bugs@gcc.gnu.org>
Subject: Re: c++/3084: anonymous namespace linking
Date: Fri, 8 Jun 2001 16:48:55 +0400
> anonymous namespace functions cannot be linked
> to global call to these functions.
>
> There is an error when linking an object file with
> the code of a function declared inside a unnamed
> "namespace {}".
>
> In the .o that includes the function code, the name
> is the form *__GLOBAL__* where in the .o that refers
> to the function code, the name is different.
>
This is not a bug, this behavior is requred by the c++
standard, and is the very reason of existence of
unnamed namespaces.
7.3.1.1 - Unnamed namespaces [namespace.unnamed]
-1- An unnamed-namespace-definition behaves as if it were
replaced by
namespace 'unique' { /* empty body */ }
using namespace 'unique';
namespace 'unique' { namespace-body }
where all occurrences of 'unique' in a translation unit are
replaced by the same identifier and this identifier differs
from all other identifiers in the entire program.*
[Footnote: Although entities in an unnamed namespace
might have external linkage, they are effectively qualified
by a name unique to their translation unit and therefore
can never be seen from any other translation unit.
--- end footnote]
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: c++/3084: anonymous namespace linking
@ 2001-07-11 10:44 mmitchel
0 siblings, 0 replies; 3+ messages in thread
From: mmitchel @ 2001-07-11 10:44 UTC (permalink / raw)
To: conversy, gcc-bugs, gcc-prs, nobody
Synopsis: anonymous namespace linking
State-Changed-From-To: open->closed
State-Changed-By: mmitchel
State-Changed-When: Wed Jul 11 10:44:20 2001
State-Changed-Why:
Not a bug.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3084&database=gcc
^ permalink raw reply [flat|nested] 3+ messages in thread
* c++/3084: anonymous namespace linking
@ 2001-06-08 4:56 conversy
0 siblings, 0 replies; 3+ messages in thread
From: conversy @ 2001-06-08 4:56 UTC (permalink / raw)
To: gcc-gnats
>Number: 3084
>Category: c++
>Synopsis: anonymous namespace linking
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Fri Jun 08 04:56:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: conversy@emn.fr
>Release: gcc version 3.0 20010426 (Debian prerelease)
>Organization:
>Environment:
i386-linux
>Description:
anonymous namespace functions cannot be linked
to global call to these functions.
There is an error when linking an object file with
the code of a function declared inside a unnamed
"namespace {}".
In the .o that includes the function code, the name
is the form *__GLOBAL__* where in the .o that refers
to the function code, the name is different.
>How-To-Repeat:
g++ AB.cpp test.cpp
gives: undefined reference to `(anonymous namespace)::operator<<(std::ostream&, (anonymous namespace)::A const&)'
AB.h:
namespace std {
struct ostream {};
extern ostream cout;
};
namespace {
struct A {};
std::ostream& operator<<(std::ostream&, const A&);
}
namespace foo {
struct B {};
}
std::ostream& operator<<(std::ostream&, const foo::B&);
AB.cpp:
#include "AB.h"
namespace {
std::ostream& operator<<(std::ostream& out, const A&) { return out; }
}
std::ostream& operator<<(std::ostream& out, const foo::B&) { return out; }
test.cpp:
#include "AB.h"
main()
{
A a;
std::cout << a;
foo::B b;
std::cout << b;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 3+ messages in thread
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2001-06-08 6:26 c++/3084: anonymous namespace linking Artem Khodush
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2001-06-08 4:56 conversy
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