id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5326	several g++ warnings found when compile boost::interprocess examples	frankrq2009@…	Ion Gaztañaga	"Hi,
When I compiled the examples on boost_1_46_1/doc/html/interprocess/synchronization_mechanisms.html, in windows 7 g++ mingw 4.5.2 generated the executable with the following warnings(though the program run correctly). 

output of g++ mingw 4.5.2 in DevC++:
Compiler: Default compiler
Building Makefile: ""C:\code\test\ipc2\dev\Makefile.win""
Executing  make...
mingw32-make -f ""C:\code\test\ipc2\dev\Makefile.win"" all
g++.exe -c ../ipc2.cpp -o ../ipc2.o -I""include""  -I""F:/boost_1_46_1""    -Wall -Wno-deprecated -DWIN32 -mthreads  -march=i686 -fexceptions  -std=gnu++0x -DNDEBUG -fexceptions -O2

In file included from F:/boost_1_46_1/boost/interprocess/errors.hpp:37:0,
                 from F:/boost_1_46_1/boost/interprocess/exceptions.hpp:20,
                 from F:/boost_1_46_1/boost/interprocess/shared_memory_object.hpp:17,
                 from ../ipc2.cpp:1:
F:/boost_1_46_1/boost/interprocess/detail/win32_api.hpp: In function 'bool boost::interprocess::winapi::get_wmi_class_attribute(std::wstring&, const wchar_t*, const wchar_t*)':
F:/boost_1_46_1/boost/interprocess/detail/win32_api.hpp:1472:21: warning: unused variable 'co_initialize_end'

In file included from F:/boost_1_46_1/boost/date_time/microsec_time_clock.hpp:23:0,
                 from F:/boost_1_46_1/boost/date_time/posix_time/posix_time_types.hpp:11,

                 from F:/boost_1_46_1/boost/interprocess/detail/posix_time_types_wrk.hpp:23,
                 from F:/boost_1_46_1/boost/interprocess/sync/scoped_lock.hpp:31,
                 from ../ipc2.cpp:3:
F:/boost_1_46_1/boost/date_time/filetime_functions.hpp: At global scope:
F:/boost_1_46_1/boost/date_time/filetime_functions.hpp:57:90: warning: declaration of 'void boost::date_time::winapi::GetSystemTimeAsFileTime(boost::date_time::winapi::FILETIME*)' with C language linkage
F:/boost_1_46_1/boost/interprocess/detail/win32_api.hpp:798:49: warning: conflicts with previous declaration 'void boost::interprocess::winapi::GetSystemTimeAsFileTime(boost::interprocess::winapi::interprocess_filetime*)'
F:/boost_1_46_1/boost/date_time/filetime_functions.hpp:58:122: warning: declaration of 'int boost::date_time::winapi::FileTimeToLocalFileTime(const boost::date_time::winapi::FILETIME*, boost::date_time::winapi::FILETIME*)' with C language linkage
F:/boost_1_46_1/boost/interprocess/detail/win32_api.hpp:799:49: warning: conflicts with previous declaration 'int boost::interprocess::winapi::FileTimeToLocalFileTime(const boost::interprocess::winapi::interprocess_filetime*, const boost::interprocess::winapi::interprocess_filetime*)'

../ipc2.cpp: In function 'int main()':
../ipc2.cpp:18:10: warning: unused variable 'remover'

g++.exe ../ipc2.o  -o ""ipc2.exe"" -L""lib"" -L""F:/boost_1_46_1/stage/lib"" -s -lole32 -loleaut32 -lboost_date_time-mgw45-mt-1_46_1  -s 

Execution terminated


source file:
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include ""doc_anonymous_mutex_shared_data.hpp""
#include <iostream>
#include <cstdio>

using namespace boost::interprocess;

int main ()
{
    try
    {
       //Remove shared memory on destruction
       struct shm_remove
       {
          ~shm_remove(){ shared_memory_object::remove(""MySharedMemory""); }
       } remover;

       //Open the shared memory object.
       shared_memory_object shm
          (open_only                    //only create
          ,""MySharedMemory""              //name
          ,read_write  //read-write mode
          );

       //Map the whole shared memory in this process
       mapped_region region
          (shm                       //What to map
          ,read_write //Map it as read-write
          );

       //Get the address of the mapped region
       void * addr       = region.get_address();

       //Construct the shared structure in memory
       shared_memory_log * data = static_cast<shared_memory_log*>(addr);

       //Write some logs
       for(int i = 0; i < 100; ++i){
          //Lock the mutex
          scoped_lock<interprocess_mutex> lock(data->mutex);
          //std::sprintf(data->items[(data->current_line++) % shared_memory_log::NumItems]
            //       ,""%s_%d"", ""process_a"", i);
        printf(""%s\n"",data->items[i]);
          if(i == (shared_memory_log::NumItems-1))
             data->end_b = true;
          //Mutex is released here
       }

       //Wait until the other process ends
       while(1){
          scoped_lock<interprocess_mutex> lock(data->mutex);
          if(data->end_a)
             break;
       }
    }
   catch(interprocess_exception &ex)
   {
      std::cout << ""ipc exception caught:"" << ex.what() << std::endl;
      return 1;
   }
   return 0;
}
"	Bugs	closed	To Be Determined	interprocess	Boost 1.45.0	Problem	wontfix	interprocess