[Bug c++/65354] New: Converting lambda to pointer results in double destruction

[Bug c++/65354] New: Converting lambda to pointer results in double destruction

[charlie at charliedyson dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65354

            Bug ID: 65354
           Summary: Converting lambda to pointer results in double
                    destruction
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: charlie at charliedyson dot net

In the following, the unique_ptr is deleted twice if the lambda is converted to
a function pointer (#if 1) but runs without error if left as a lambda.

Compiled with g++-4.8 test.cpp -o test -std=c++1y on Linux Mint 17 x64.

I get the following output in the function pointer case:
Bye
Bye
*** Error in `./test': double free or corruption (fasttop): 0x0000000001e5c010
***
Aborted

Here's the code:

#include <memory>
#include <iostream>

struct X
{
    ~X () { std::cout << "Bye" << std::endl; }
};

struct Y
{
    explicit Y (std::unique_ptr<X> x)
    : m_x (std::move (x))
    { }

    std::unique_ptr<X> m_x;
};

int main ()
{
    using F = Y (*) (std::unique_ptr<X>);
    auto p = std::unique_ptr<X> {new X};

#if 1
    F f =
#else
    auto f =
#endif
    [] (std::unique_ptr<X> x)
    {
        return Y (std::move (x));
    };
    f (std::move (p));
}

[Bug c++/65354] Converting lambda to pointer results in double destruction

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65354

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler@googlemail.
                   |                            |com

--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The problem also occurs in all release versions of 4.9.x and in the current
HEAD 5.0.0 20150306 (experimental).
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Subject: [Bug target/62251] FAIL: gfortran.dg/quad_2.f90 execution test
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idb251

--- Comment #8 from John David Anglin <danglin at gcc dot gnu.org> ---
Author: danglin
Date: Sun Mar  8 22:58:52 2015
New Revision: 221267

URL: https://gcc.gnu.org/viewcvs?rev"1267&root=gcc&view=rev
Log:
    PR target/62251
    * gfortran.dg/quad_2.f90: xfail hppa*-*-hpux*.


Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gfortran.dg/quad_2.f90

[Bug c++/65354] Converting lambda to pointer results in double destruction

[charlie at charliedyson dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65354

--- Comment #2 from Charlie <charlie at charliedyson dot net> ---
Here's a more succinct example (using the "+" trick to convert to a function
pointer):

#include <iostream>

int main ()
{
    auto f = +[] (std::string s)
    {
      return std::string (std::move (s));
    };
    std::string s ("hello");
    f (std::move (s));
}

[Bug c++/65354] Converting lambda to pointer results in double destruction

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65354

Jonathan Wakely <redi at gcc dot gnu.org> changed:

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

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is PR 62052

*** This bug has been marked as a duplicate of bug 62052 ***