[Boost-bugs] [Boost C++ Libraries] #5326: several g++ warnings found when compile boost::interprocess examples

Subject: [Boost-bugs] [Boost C++ Libraries] #5326: several g++ warnings found when compile boost::interprocess examples
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-03-17 02:35:02

#5326: several g++ warnings found when compile boost::interprocess examples
---------------------------------+------------------------------------------
 Reporter:  frankrq2009@…        |       Owner:  igaztanaga  
     Type:  Bugs                 |      Status:  new         
Milestone:  To Be Determined     |   Component:  interprocess
  Version:  Boost 1.45.0         |    Severity:  Problem     
 Keywords:  interprocess         |  
---------------------------------+------------------------------------------
 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;
 }

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5326>
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