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From: "jarrydb at cse dot unsw.edu.au" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/50893] New: [C++0x] explicitly defaulted virtual destructor throw specification
Date: Fri, 28 Oct 2011 06:24:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D50893

             Bug #: 50893
           Summary: [C++0x] explicitly defaulted virtual destructor throw
                    specification
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jarrydb@cse.unsw.edu.au


The following code fails to compile:

class Base
{
  public:
  virtual ~Base() =3D default;
};

class Derived : public Base
{
  public:
  virtual ~Derived() =3D default;
};

g++ -std=3Dgnu++0x except.cpp=20
except.cpp:10:11: error: looser throw specifier for =E2=80=98virtual
Derived::~Derived()=E2=80=99
except.cpp:4:11: error:   overriding =E2=80=98virtual Base::~Base() noexcep=
t (true)=E2=80=99

I think, according to 15.4.14, that Derived should, by default, have the sa=
me
exception specification as Base, ie. noexcept(true). Therefore, this code
should compile.

Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/home/jarrydb/current/soft/install-latest/libexec/gcc=
/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/jarrydb/current/soft/src/gcc-git/configure
--prefix=3D/home/jarrydb/current/soft/install-latest --disable-multilib
--enable-languages=3Dc,c++
Thread model: posix
gcc version 4.7.0 20111027 (experimental) (GCC)