[Bug c++/66542] New: [C++11] Can create static variable of type that has deleted destructor

[Bug c++/66542] New: [C++11] Can create static variable of type that has deleted destructor

[fordeso2 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

            Bug ID: 66542
           Summary: [C++11] Can create static variable of type that has
                    deleted destructor
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fordeso2 at gmail dot com
  Target Milestone: ---

Created attachment 35782
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35782&action=edit
Preprocessed file with bug

when a class has user-defined (not default) constructor and destructor marked
deleted, gcc allows creating of a static variable of class's type.

Command line: gcc -std=c++11 -lstdc++ ret.cpp

Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc-multilib/src/gcc-5-20150519/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --enable-multilib --disable-werror
--enable-checking=release --with-default-libstdcxx-abi=c++98
Thread model: posix

Attached preprocessed file.

[Bug c++/66542] [4.9/5/6 Regression] [C++11] Can create static variable of type that has deleted destructor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-06-15
      Known to work|                            |4.8.3
            Summary|[C++11] Can create static   |[4.9/5/6 Regression]
                   |variable of type that has   |[C++11] Can create static
                   |deleted destructor          |variable of type that has
                   |                            |deleted destructor
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.2, 5.1.0, 6.0

[Bug c++/66542] [4.9/5/6 Regression] [C++11] Can create static variable of type that has deleted destructor

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

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> ---
This seems to be a regression versus gcc 4.8.2
>From gcc-bugs-return-489028-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jun 15 18:08:23 2015
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Subject: [Bug sanitizer/66514] UBSAN: Add -fsanitize=lifetime
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66514

Jason Merrill <jason at gcc dot gnu.org> changed:

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

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #3)
> Ok, after reading your caution and test-cases mentioned in the ASAN tracker,
> I think emitting a poison memory call in a dtor for instances that does not
> use placement new can be beneficial. However, I can't evaluate if getting
> such kind of information in doable in GCC?

We could certainly emit the poison call where we currently have the clobber.
>From gcc-bugs-return-489029-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jun 15 18:56:07 2015
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf544

--- Comment #1 from Gerhard Steinmetz <gerhard.steinmetz.fortran@t-online.de> ---
Originally not the above z0.f90, but this code was thought as test case :

$ cat z0.f90
   module m
   contains
      function f() result(z)
         procedure(f), pointer :: z
      end
   end module


$ gfortran -g -O0 -Wall -fcheck=all -fno-frontend-optimize -fimplicit-none -c
z0.f90

But anyway, the result is the same.

[Bug c++/66542] [4.9/5/6 Regression] [C++11] Can create static variable of type that has deleted destructor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Daniel Krügler from comment #1)
> This seems to be a regression versus gcc 4.8.2

That's why I changed the title to say [4.9/5/6 Regression] :-)
>From gcc-bugs-return-489036-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Jun 15 21:14:22 2015
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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug jit/66546] New: No way to disable check for unreachable blocks
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf546

            Bug ID: 66546
           Summary: No way to disable check for unreachable blocks
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: jit
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

Currently libgccjit always issues a hard error about unconditional blocks.

Some interpreters (e.g. Lua) generate bytecode that may have unreachable
instructions, so it should make it easier for client code if they can have a
way to turn off this check.

See https://gcc.gnu.org/ml/jit/2015-q2/msg00057.html

[Bug c++/66542] [4.9/5/6 Regression] [C++11] Can create static variable of type that has deleted destructor

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jason at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org

[Bug c++/66542] [4.9/5/6 Regression] [C++11] Can create static variable of type that has deleted destructor

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue Jun 23 14:08:19 2015
New Revision: 224842

URL: https://gcc.gnu.org/viewcvs?rev=224842&root=gcc&view=rev
Log:
        PR c++/66542
        * decl.c (expand_static_init): Make sure the destructor is callable
        here even if we have an initializer.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/deleted12.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c

[Bug c++/66542] [4.9/5/6 Regression] [C++11] Can create static variable of type that has deleted destructor

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66542

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |6.0

--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 6; I tend not to backport fixes for invalid code bugs.