[Boost-bugs] [Boost C++ Libraries] #6873: g++-4.7.0 warns about non-virtual destructor when -Wall

Subject: [Boost-bugs] [Boost C++ Libraries] #6873: g++-4.7.0 warns about non-virtual destructor when -Wall
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-05-06 19:08:36

#6873: g++-4.7.0 warns about non-virtual destructor when -Wall
----------------------------------------------+-----------------------------
 Reporter:  david x callaway <dxc@…>          |       Owner:  anthonyw
     Type:  Bugs                              |      Status:  new     
Milestone:  To Be Determined                  |   Component:  threads 
  Version:  Boost 1.49.0                      |    Severity:  Problem 
 Keywords:                                    |  
----------------------------------------------+-----------------------------
 {{{

 // output lines are pre-broken because I didn't know what your
 // formatter would do to it.
 //
 // sure, I could turn the warning off, but I don't want to turn it off for
 // production code and I don't want to use a bunch of pragmas and
 // conditional garbage to make gcc and msvc happy.
 //
 //    thx
 //    dxc
 //
 // compile the test code like this (use your own appropriate paths):
 //     /opt/gcc-4.7.0/bin/g++ -m64  -Wall -I ../boost t.cpp
 //        ~/boost/boost/osx/lib/libboost_thread-xgcc42-mt-s-1_49.a
 // fails, see errors included below, after the test code.

 // boost-1.49.0, test code compiled  on os/x 10.7.3
 // we normally compile -Werror -Wall -Wextra, so to us this failure is
 // a serious problem.

 // gcc-4.6.3 built the same way (using the same build script to build
 // gcc) compiles this with no warnings.
 // if no -Wall gcc-4.7.0 also compiles it with no warnings.
 // gcc-4.7.0 output with -Wall is shown after the test code

 // --- cut ---
 #include "boost/thread.hpp"
 int main(int /* argc */, const char** /* argv */)
 {
     return 0;
 }
 // --- cut ---

 //-----------------------------------------------------

 // gcc -v output:
 // Using built-in specs.
 // COLLECT_GCC=/opt/gcc-4.7.0/bin/gcc
 // COLLECT_LTO_WRAPPER=/opt/gcc-4.7.0/libexec/gcc/x86_64-apple-
 darwin11.3.0/4.7.0/lto-wrapper
 // Target: x86_64-apple-darwin11.3.0
 // Configured with: ../gcc-4.7.0/configure --prefix=/opt/gcc-4.7.0
 //     --enable-languages=c,c++
 //     --disable-nls --enable-__cxa_atexit --enable-shared --enable-
 threads
 //     --with-gmp=/opt/gcc-4.7.0 --with-mpc=/opt/gcc-4.7.0 --with-
 mpfr=/opt/gcc-4.7.0
 // Thread model: posix
 // gcc version 4.7.0 (GCC)

 //-----------------------------------------------------

 // compiler output from g++-4.7.0:

 // In file included from ../boost/boost/smart_ptr/shared_ptr.hpp:30:0,
 //                  from ../boost/boost/shared_ptr.hpp:17,
 //                  from ../boost/boost/thread/pthread/thread_data.hpp:10,
 //                  from ../boost/boost/thread/thread.hpp:17,
 //                  from ../boost/boost/thread.hpp:13,
 //                  from t.cpp:24:
 // ../boost/boost/checked_delete.hpp: In instantiation of 'void
 boost::checked_delete(T*) [with T =
 // boost::error_info<boost::tag_original_exception_type, const
 std::type_info*>]':
 // ../boost/boost/smart_ptr/detail/shared_count.hpp:95:13:   required from
 // 'boost::detail::shared_count::shared_count(Y*) [with Y =
 // boost::error_info<boost::tag_original_exception_type, const
 std::type_info*>]'
 // ../boost/boost/smart_ptr/shared_ptr.hpp:183:50:   required from
 // 'boost::shared_ptr<T>::shared_ptr(Y*) [with Y =
 // boost::error_info<boost::tag_original_exception_type, const
 std::type_info*>; T =
 // boost::error_info<boost::tag_original_exception_type, const
 std::type_info*>]'
 // ../boost/boost/exception/info.hpp:171:69:   required from 'const E&
 // boost::exception_detail::set_info(const E&, const
 boost::error_info<Tag, T>&) [with E =
 // boost::unknown_exception; Tag = boost::tag_original_exception_type; T =
 const std::type_info*]'
 // ../boost/boost/exception/info.hpp:192:46:   required from 'typename
 // boost::enable_if<boost::exception_detail::derives_boost_exception<E>,
 const E&>::type
 // boost::operator<<(const E&, const boost::error_info<Tag, T>&) [with E =
 boost::unknown_exception;
 // Tag = boost::tag_original_exception_type; T = const std::type_info*;
 typename
 // boost::enable_if<boost::exception_detail::derives_boost_exception<E>,
 const E&>::type = const
 // boost::unknown_exception&]'
 // ../boost/boost/exception/detail/exception_ptr.hpp:182:13:   required
 from 'void
 // boost::unknown_exception::add_original_type(const E&) [with E =
 std::exception]'
 // ../boost/boost/exception/detail/exception_ptr.hpp:161:32:   required
 from here
 // ../boost/boost/checked_delete.hpp:34:5: warning: deleting object of
 polymorphic class type
 // 'boost::error_info<boost::tag_original_exception_type, const
 std::type_info*>' which has non-virtual
 // destructor might cause undefined behaviour [-Wdelete-non-virtual-dtor]


 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6873>
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