Warnings from shared_mutex.hpp when including thread.hpp

[barnabe.faliu@…]

Just by including <boost/thread/thread.hpp>, when I compile my program I get thoose warnings:

'''C:\Boost\boost_1_52_0/boost/thread/win32/shared_mutex.hpp: In instantiation of 'T boost::shared_mutex::interlocked_compare_exchange(T*, T, T) [with T = boost::shared_mutex::state_data]':
C:\Boost\boost_1_52_0/boost/thread/win32/shared_mutex.hpp:124:103:   required from here
C:\Boost\boost_1_52_0/boost/thread/win32/shared_mutex.hpp:52:99: warning: dereferencing type-punned pointer will break strict-aliasing rules
C:\Boost\boost_1_52_0/boost/thread/win32/shared_mutex.hpp:52:99: warning: dereferencing type-punned pointer will break strict-aliasing rules
C:\Boost\boost_1_52_0/boost/thread/win32/shared_mutex.hpp:53:52: warning: dereferencing type-punned pointer will break strict-aliasing rules
C:\Boost\boost_1_52_0/boost/thread/win32/shared_mutex.hpp:53:52: warning: dereferencing type-punned pointer will break strict-aliasing rules'''

Help please !

[mwilamowski[|]wne.uw.edu.pl]

Hi, I have the same problem. Windows 7 64-bit, MinGW (g++ 4.7.0). Boost 1.52.

I'm writing here because i noticed that this error (warnings) do not appear with O0 and O1 flags but they do with O2 and O3. Maybe that helps.

Whats more the program compiles and works without any problems (though my application is not very complex).

[anonymous]

Just want to add that i just tested it with g++ 4.7.2 and with and without -std=gnu++11 flag. Problem appears consistently.

[viboes]

Please, could you tell me if the warnings appear when you define BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN?

[viboes]

Duplicated from #7817 as it contains more warnings.

[anonymous]

It does appear even if i define BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN !!

[viboes]

Reopened as BOOST_THREAD_PROVIDES_GENERIC_SHARED_MUTEX_ON_WIN will not be defined by default and as #7906 states there is a lost in performances when this define is defined.