[Bug c++/29417] New: link fails with debug and anonymous namespace

[Bug c++/29417] New: link fails with debug and anonymous namespace

[peter at chocky dot org]

This is with:

gcc (GCC) 4.2.0 20061007 (experimental)

On x86 Debian and under Fedora Core 3.

Using the lamba part of the boost library, the following is seen:


/tmp/ccNdhcXx.o:(.debug_info+0xec9): undefined reference to
`boost::lambda::(anonymous namespace)::free2'
/tmp/ccNdhcXx.o:(.debug_info+0xed8): undefined reference to
`boost::lambda::(anonymous namespace)::free3'
/tmp/ccNdhcXx.o:(.debug_info+0x47f2): undefined reference to
`boost::lambda::(anonymous namespace)::free2'
/tmp/ccNdhcXx.o:(.debug_info+0x4806): undefined reference to
`boost::lambda::(anonymous namespace)::free3'

I don't think the fault is in the boost library.  Here is the code in question:

namespace {

  // These are constants types and need to be initialised
  boost::lambda::placeholder1_type free1 = boost::lambda::placeholder1_type();
  boost::lambda::placeholder2_type free2 = boost::lambda::placeholder2_type();
  boost::lambda::placeholder3_type free3 = boost::lambda::placeholder3_type();

  boost::lambda::placeholder1_type& _1 = free1;
  boost::lambda::placeholder2_type& _2 = free2;
  boost::lambda::placeholder3_type& _3 = free3;
  // _1, _2, ... naming scheme by Peter Dimov
} // unnamed

To trigger the problem requires at least -O and -g2.  My C++ isn't good enough
to comment further.  I attach a minimal preprocessed case.  compile with:

g++-4.2 test.ii -O -g2 

This works correctly on previous GCC versions, and with -g1.


-- 
           Summary: link fails with debug and anonymous namespace
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: peter at chocky dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] link fails with debug and anonymous namespace

[peter at chocky dot org]

------- Comment #1 from peter at chocky dot org  2006-10-10 16:17 -------
Created an attachment (id=12405)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12405&action=view)
minimal test case


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
           Severity|normal                      |critical
           Keywords|                            |link-failure
            Summary|link fails with debug and   |[4.2 Regression] link fails
                   |anonymous namespace         |with debug and anonymous
                   |                            |namespace
   Target Milestone|---                         |4.2.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2006-10-11 01:21 -------
Reducing.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2006-10-11 02:48 -------
Reduced testcase:
template <int>
struct lambda_functor 
{
  lambda_functor() {}
};
namespace {
lambda_functor<2 > free2;
lambda_functor<3 > free3;
lambda_functor<3 > & _3 = free3;
}
int main (void){}


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2006-10-11 02:48:51
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2006-10-11 02:50 -------
I think this is related to PR 27657.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |27657


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[janis at gcc dot gnu dot org]

------- Comment #5 from janis at gcc dot gnu dot org  2006-10-17 16:25 -------
A regression hunt on powerpc-linux identified the following patch:

    http://gcc.gnu.org/viewcvs?view=rev&rev=115086

    r115086 | jason | 2006-06-30 01:15:56 +0000 (Fri, 30 Jun 2006)


-- 

janis at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417

[Bug c++/29417] [4.2 Regression] link fails with debug and anonymous namespace

[pinskia at gcc dot gnu dot org]

------- Comment #6 from pinskia at gcc dot gnu dot org  2006-10-20 07:42 -------
(In reply to comment #5)
> A regression hunt on powerpc-linux identified the following patch:

This just confirms the problem here is the same as listed in PR 27657 as that
patch cause anonymous namespace to be local linkage. Closing as a dup of PR
27657.

*** This bug has been marked as a duplicate of 27657 ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29417