After compiling everything, I get those errors on Visual C++ Studio 2010.
Probably I am missing any library? If it's that can you help me to guess which one?Err
1> Creating library \Bin\Engine.lib and object \Bin\Engine.exp
1>UILoginNew.obj : error LNK2001: unresolved external symbol "public: void __thiscall boost::thread::detach(void)" (?detach#thread#boost##QAEXXZ)
1>UILoginNew.obj : error LNK2001: unresolved external symbol "private: bool __thiscall boost::thread::start_thread_noexcept(void)" (?start_thread_noexcept#thread#boost##AAE_NXZ)
1>SMCSCAN.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category#system#boost##YAABVerror_category#12#XZ)
1>UILoginNew.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category#system#boost##YAABVerror_category#12#XZ)
1>NetClient.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category#system#boost##YAABVerror_category#12#XZ)
1>StdH.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category#system#boost##YAABVerror_category#12#XZ)
1>smcPars.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category#system#boost##YAABVerror_category#12#XZ)
1>UILoginNew.obj : error LNK2001: unresolved external symbol "public: virtual __thiscall boost::detail::thread_data_base::~thread_data_base(void)" (??1thread_data_base#detail#boost##UAE#XZ)
1>StdH.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::generic_category(void)" (?generic_category#system#boost##YAABVerror_category#12#XZ)
1>smcPars.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::generic_category(void)" (?generic_category#system#boost##YAABVerror_category#12#XZ)
1>SMCSCAN.obj : error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::generic_category(void)" (?generic_category#system#boost##YAABVerror_category#12#XZ)
1>\Bin\Engine.dll : fatal error LNK1120: 5 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========```
I fixed that by reinstalling Boost 1.58. 32 bits
Maybe I had x64 libs
Related
I'm compiling VLC 2.1.0 Source code in VS 2010 but getting some unresolved external symbols in help.obj file. The errors are as follows.
Error 54 error LNK2001: unresolved external symbol "public: virtual
struct QMetaObject const * __thiscall
UpdateDialog::metaObject(void)const "
(?metaObject#UpdateDialog##UBEPBUQMetaObject##XZ) D:\VidPlaya_offline\TryingToIncludeUpdateFacility\Vidplaya_Plugin_EmbeddedUpdate\vlcwin\lib_plugin\help.obj
Error 55 error LNK2001: unresolved external symbol "public: virtual
void * __thiscall UpdateDialog::qt_metacast(char const *)"
(?qt_metacast#UpdateDialog##UAEPAXPBD#Z) D:\VidPlaya_offline\TryingToIncludeUpdateFacility\Vidplaya_Plugin_EmbeddedUpdate\vlcwin\lib_plugin\help.obj
Error 56 error LNK2001: unresolved external symbol "public: virtual
int __thiscall UpdateDialog::qt_metacall(enum
QMetaObject::Call,int,void * *)"
(?qt_metacall#UpdateDialog##UAEHW4Call#QMetaObject##HPAPAX#Z) D:\VidPlaya_offline\TryingToIncludeUpdateFacility\Vidplaya_Plugin_EmbeddedUpdate\vlcwin\lib_plugin\help.obj
Error 57 error LNK1120: 3 unresolved
externals D:\VidPlaya_offline\TryingToIncludeUpdateFacility\Vidplaya_Plugin_EmbeddedUpdate\vlcwin\Release\plugins\lib_plugin.dll
I tried, Generating Meta Object file(help.moc.cpp) but it didn't help me.
Any suggestions would be appreciated. I'm new to this Win32 environment.
After changing some files in project, following compilation error is coming. it seems it is unable to find library placement new operator.
resiprocate.lib(Contents.obj) : error LNK2001: unresolved external symbol "void * __cdecl >operator new(unsigned int,class resip::PoolBase *)" (??2#YAPAXIPAVPoolBase#resip###Z)
resiprocate.lib(ExistsOrDataParameter.obj) : error LNK2001: unresolved external symbol >"void * __cdecl operator new(unsigned int,class resip::PoolBase *)" (??>2#YAPAXIPAVPoolBase#resip###Z)
resiprocate.lib(StringCategory.obj) : error LNK2001: unresolved external symbol "void * >__cdecl operator new(unsigned int,class resip::PoolBase *)" (??>2#YAPAXIPAVPoolBase#resip###Z)
resiprocate.lib(Auth.obj) : error LNK2001: unresolved external symbol "void * __cdecl >operator new(unsigned int,class resip::PoolBase *)" (??2#YAPAXIPAVPoolBase#resip###Z)
resiprocate.lib(UInt32Category.obj) : error LNK2001: unresolved external symbol "void * >__cdecl operator new(unsigned int,class resip::PoolBase *)" (??
I am new to Openssl, and trying to run a dhclient program available online at http://www.josuegomes.com/codeblog/dhclient.htm.
While doing so I get following errors,
dhclient.cpp
1>dhclient.obj : error LNK2019: unresolved external symbol _ERR_print_errors_fp referenced in function "void __cdecl handle_error(char const *,int,char const *)" (?handle_error##YAXPBDH0#Z)
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_load_error_strings referenced in function "void __cdecl init_OpenSSL(void)" (?init_OpenSSL##YAXXZ)
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_library_init referenced in function "void __cdecl init_OpenSSL(void)" (?init_OpenSSL##YAXXZ)
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_CTX_set_cipher_list referenced in function "struct ssl_ctx_st * __cdecl setup_ctx(void)" (?setup_ctx##YAPAUssl_ctx_st##XZ)
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_CTX_new referenced in function "struct ssl_ctx_st * __cdecl setup_ctx(void)" (?setup_ctx##YAPAUssl_ctx_st##XZ)
1>dhclient.obj : error LNK2019: unresolved external symbol _TLSv1_client_method referenced in function "struct ssl_ctx_st * __cdecl setup_ctx(void)" (?setup_ctx##YAPAUssl_ctx_st##XZ)
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_CTX_free referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_free referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_shutdown referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_read referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_write referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_connect referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_set_bio referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _SSL_new referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _BIO_ctrl referenced in function _main
1>dhclient.obj : error LNK2019: unresolved external symbol _BIO_new_connect referenced in function _main
1>C:\Users\Rucha\Documents\Visual Studio 2010\Projects\emptyprojectssl\Debug\emptyprojectssl.exe : fatal error LNK1120: 16 unresolved externals
I have added includes and library paths, also my runtime library is MD and I have added ssleay32MD.lib
libeay32MD.lib to external dependencies.
Please help.
I had a similar issue and i solved.
Try to look if you are using the right libraries, i mean if you are using x64 lib and compiling with 32-bit then it will through the same error.
Happy Coding
I think the debug libs are ssleay32MDd.lib and libeay32MDd.lib (note the "d" suffix).
Overflowers!
I've been developing a statically-linked application using Visual Studio 2010 (well, it's cross-platform, but this is just a Windows issue).
I had few issues setting up the linking for the Debug configuration, so I didn't expect it would be hard to change it to make a Release configuration, but after an afternoon's work it's still eluding me. Trying various values for NODEFAULTLIB either get me "unresolved external symbol" errors or "already defined in" errors and sometimes both.
From my notes, I've tried NODEFAULTLIB-ing LIBCMT, MSVCRT, MSVCPRT, or none at all, with different results each time (see below for details).
Now, my Debug configuration uses /NODEFAULTLIB:MSVCRTD /NODEFAULTLIB:MSVCPRTD and that works fine, so you'd think that /NODEFAULTLIB:MSVCRT /NODEFAULTLIB:MSVCPRT would work for the Release configuration. And the fact that it doesn't is a red flag for me...
I'm linking with several other libraries - I was pretty careful to systematically make sure that they were considered exactly the same when going from Debug to Release but could that conceivably be an issue, and if so how to track it down systematically?
Thanks for your gracious time!
In the Linker/Command Line property page, All Options is:
/OUT:".\Release\SlowGold 8.exe" /NOLOGO "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /MANIFEST /ManifestFile:".\Release\SlowGold 8.exe.intermediate.manifest" /ALLOWISOLATION /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /PDB:".\Release\SlowGold 8.pdb" /SUBSYSTEM:WINDOWS /OPT:REF /OPT:ICF /PGD:"C:\development\rec-vs\rec\projects\slow\Builds\VisualStudio2010\Release\SlowGold 8.pgd" /LTCG /TLBID:1 /DYNAMICBASE /NXCOMPAT /MACHINE:X86 /ERRORREPORT:QUEUE
and Additional Options is:
/LIBPATH:..\\..\\..\\..\\externals\\rubberband\\win32\\ipp\\common ippacemerged.lib ippacmerged.lib ippcorel.lib ippsemerged.lib ippsmerged.lib ippsremerged.lib ippsrmerged.lib /LIBPATH:..\\..\\..\\..\\externals\\rubberband\\win32\\ipp\\release\\static rubberband-library.lib /LIBPATH:..\\..\\..\\..\\..\\glog\\Release libglog_static.lib /LIBPATH:..\\..\\..\\..\\..\\mpg123\\ports\\MSVC++\\2008\\Release libmpg123.lib /LIBPATH:..\\..\\..\\..\\..\\protobuf\\vsprojects\\Release libprotobuf.lib
And here are some error messages for various /NODEFAULTLIB: values.
Best so far: /NODEFAULTLIB:LIBCMT
1>------ Build started: Project: Slow, Configuration: Release Win32 ------
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::basic_ostream<char,struct std::char_traits<char> >(class std::basic_streambuf<char,struct std::char_traits<char> > *,bool)" (??0?$basic_ostream#DU?$char_traits#D#std###std##QAE#PAV?$basic_streambuf#DU?$char_traits#D#std###1#_N#Z) already defined in libcpmt.lib(cerr.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "void __cdecl std::_Xlength_error(char const *)" (?_Xlength_error#std##YAXPBD#Z) already defined in libcpmt.lib(xthrow.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "void __cdecl std::_Xout_of_range(char const *)" (?_Xout_of_range#std##YAXPBD#Z) already defined in libcpmt.lib(xthrow.obj)
1>.\Release\SlowGold 8.exe : fatal error LNK1169: one or more multiply defined symbols found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Another attempt with only /NODEFAULTLIB:MSVCRT
1>------ Build started: Project: Slow, Configuration: Release Win32 ------
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::basic_ostream<char,struct std::char_traits<char> >(class std::basic_streambuf<char,struct std::char_traits<char> > *,bool)" (??0?$basic_ostream#DU?$char_traits#D#std###std##QAE#PAV?$basic_streambuf#DU?$char_traits#D#std###1#_N#Z) already defined in libcpmt.lib(cerr.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "void __cdecl std::_Xlength_error(char const *)" (?_Xlength_error#std##YAXPBD#Z) already defined in libcpmt.lib(xthrow.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "void __cdecl std::_Xout_of_range(char const *)" (?_Xout_of_range#std##YAXPBD#Z) already defined in libcpmt.lib(xthrow.obj)
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp__strncat
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp__perror
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp___pclose
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl _open(char const *,int,int)" (__imp_?_open##YAHPBDHH#Z)
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp___access
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp___popen
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp___wassert
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp__fdopen
1>OLDNAMES.lib(fdopen.obi) : error LNK2001: unresolved external symbol __imp__fdopen
1>libglog_static.lib(logging.obj) : error LNK2001: unresolved external symbol __imp__unlink
1>OLDNAMES.lib(unlink.obi) : error LNK2001: unresolved external symbol __imp__unlink
1>libglog_static.lib(utilities.obj) : error LNK2001: unresolved external symbol __imp___getpid
1>libglog_static.lib(port.obj) : error LNK2001: unresolved external symbol __imp___vsnprintf
1>libprotobuf.lib(message.obj) : error LNK2001: unresolved external symbol __imp__ldiv
1>libprotobuf.lib(descriptor.obj) : error LNK2001: unresolved external symbol __imp__ldiv
1>libprotobuf.lib(extension_set.obj) : error LNK2001: unresolved external symbol __imp__ldiv
1>libprotobuf.lib(common.obj) : error LNK2001: unresolved external symbol __imp___snprintf
1>libprotobuf.lib(strutil.obj) : error LNK2001: unresolved external symbol __imp___snprintf
1>OLDNAMES.lib(fdopen.obi) : error LNK2001: unresolved external symbol __imp___fdopen
1>OLDNAMES.lib(unlink.obi) : error LNK2001: unresolved external symbol __imp___unlink
1>.\Release\SlowGold 8.exe : fatal error LNK1120: 15 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Without /NODEFAULTLIB:
1>------ Build started: Project: Slow, Configuration: Release Win32 ------
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "public: __thiscall std::basic_ostream<char,struct std::char_traits<char> >::basic_ostream<char,struct std::char_traits<char> >(class std::basic_streambuf<char,struct std::char_traits<char> > *,bool)" (??0?$basic_ostream#DU?$char_traits#D#std###std##QAE#PAV?$basic_streambuf#DU?$char_traits#D#std###1#_N#Z) already defined in libcpmt.lib(cerr.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "void __cdecl std::_Xlength_error(char const *)" (?_Xlength_error#std##YAXPBD#Z) already defined in libcpmt.lib(xthrow.obj)
1>msvcprt.lib(MSVCP100.dll) : error LNK2005: "void __cdecl std::_Xout_of_range(char const *)" (?_Xout_of_range#std##YAXPBD#Z) already defined in libcpmt.lib(xthrow.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __stricmp already defined in LIBCMT.lib(stricmp.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strerror_s already defined in LIBCMT.lib(strerror.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _fflush already defined in LIBCMT.lib(fflush.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strtol already defined in LIBCMT.lib(strtol.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strrchr already defined in LIBCMT.lib(strrchr.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __write already defined in LIBCMT.lib(write.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __close already defined in LIBCMT.lib(close.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: "public: __thiscall std::exception::exception(char const * const &)" (??0exception#std##QAE#ABQBD#Z) already defined in LIBCMT.lib(stdexcpt.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: "public: virtual __thiscall std::exception::~exception(void)" (??1exception#std##UAE#XZ) already defined in LIBCMT.lib(stdexcpt.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _memmove already defined in LIBCMT.lib(memmove.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: "public: __thiscall std::exception::exception(class std::exception const &)" (??0exception#std##QAE#ABV01##Z) already defined in LIBCMT.lib(stdexcpt.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _printf already defined in LIBCMT.lib(printf.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _fprintf already defined in LIBCMT.lib(fprintf.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: ___iob_func already defined in LIBCMT.lib(_file.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _abort already defined in LIBCMT.lib(abort.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _memchr already defined in LIBCMT.lib(memchr.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __strtoi64 already defined in LIBCMT.lib(strtoq.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __strtoui64 already defined in LIBCMT.lib(strtoq.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strtoul already defined in LIBCMT.lib(strtol.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __errno already defined in LIBCMT.lib(dosmap.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strerror already defined in LIBCMT.lib(strerror.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strchr already defined in LIBCMT.lib(strchr.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _sprintf already defined in LIBCMT.lib(sprintf.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strtod already defined in LIBCMT.lib(strtod.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: _strpbrk already defined in LIBCMT.lib(strpbrk.obj)
1>MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info##AAE#ABV0##Z) already defined in LIBCMT.lib(typinfo.obj)
1>MSVCRT.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info##AAEAAV0#ABV0##Z) already defined in LIBCMT.lib(typinfo.obj)
1>MSVCRT.lib(MSVCR100.dll) : error LNK2005: __read already defined in LIBCMT.lib(read.obj)
1>LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library
1>.\Release\SlowGold 8.exe : fatal error LNK1169: one or more multiply defined symbols found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Hans Passant provided me the key to the solution in his comments to my problem! If he'd come back and phrase them as an answer, I'd erase this and credit him...
As predicted, one of the third-party libraries was not set to /MT in release (but it was /MTd in debug) - changing that flag made it all work.
You find the option in Properties - C/C++ - Code Generation - Runtime Library
I am getting very strange errors and i am not able to understand what these errors actually mean when build my project in visual studio it gives me the following errors can anybody tells me what actually these error means i though that there are some configuration issues i am doing socket programming and network programming.
Here are the bunch of error your help weill be highly appreciated....
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppBuild.targets(990,5): warning MSB8012: TargetPath(E:\Study\FWIF\demola\ext-libs\libcommoncpp2-1.6.0\w32\Debug\ccgnu2.dll) does not match the Linker's OutputFile property value (E:\Study\FWIF\demola\ext-libs\libcommoncpp2-1.6.0\w32\Debug\CapeCommon14.dll). This may cause your project to build incorrectly. To correct this, please make sure that $(OutDir), $(TargetName) and $(TargetExt) property values match the value specified in %(Link.OutputFile).
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppBuild.targets(992,5): warning MSB8012: TargetName(ccgnu2) does not match the Linker's OutputFile property value (CapeCommon14). This may cause your project to build incorrectly. To correct this, please make sure that $(OutDir), $(TargetName) and $(TargetExt) property values match the value specified in %(Link.OutputFile).
1> Creating library E:\Study\FWIF\demola\ext-libs\libcommoncpp2-1.6.0\w32\Debug\CapeCommon14.lib and object E:\Study\FWIF\demola\ext-libs\libcommoncpp2-1.6.0\w32\Debug\CapeCommon14.exp
1>socket.obj : error LNK2019: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct sockaddr const *)const " (?isMember#IPV4Cidr#ost##QBE_NPBUsockaddr###Z) referenced in function "public: bool __thiscall ost::IPV4Cidr::operator==(struct sockaddr const *)const " (??8IPV4Cidr#ost##QBE_NPBUsockaddr###Z)
1>in6addr.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct sockaddr const *)const " (?isMember#IPV4Cidr#ost##QBE_NPBUsockaddr###Z)
1>inaddr.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct sockaddr const *)const " (?isMember#IPV4Cidr#ost##QBE_NPBUsockaddr###Z)
1>peer.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct sockaddr const *)const " (?isMember#IPV4Cidr#ost##QBE_NPBUsockaddr###Z)
1>simplesocket.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct sockaddr const *)const " (?isMember#IPV4Cidr#ost##QBE_NPBUsockaddr###Z)
1>socket.obj : error LNK2019: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct in_addr const &)const " (?isMember#IPV4Cidr#ost##QBE_NABUin_addr###Z) referenced in function "public: bool __thiscall ost::IPV4Cidr::operator==(struct in_addr const &)const " (??8IPV4Cidr#ost##QBE_NABUin_addr###Z)
1>in6addr.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct in_addr const &)const " (?isMember#IPV4Cidr#ost##QBE_NABUin_addr###Z)
1>inaddr.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct in_addr const &)const " (?isMember#IPV4Cidr#ost##QBE_NABUin_addr###Z)
1>peer.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct in_addr const &)const " (?isMember#IPV4Cidr#ost##QBE_NABUin_addr###Z)
1>simplesocket.obj : error LNK2001: unresolved external symbol "public: bool __thiscall ost::IPV4Cidr::isMember(struct in_addr const &)const " (?isMember#IPV4Cidr#ost##QBE_NABUin_addr###Z)
1>E:\Study\FWIF\demola\ext-libs\libcommoncpp2-1.6.0\w32\Debug\CapeCommon14.dll : fatal error LNK1120: 2 unresolved externals
2>------ Build started: Project: buffer, Configuration: Debug Win32 ------
2> buffer.cpp
2>e:\study\fwif\demola\ext-libs\libcommoncpp2-1.6.0\demo\buffer.cpp(41): fatal error C1083: Cannot open include file: 'cc++/buffer.h': No such file or directory
========== Build: 0 succeeded, 2 failed, 0 up-to-date, 0 skipped ==========
For the errors in project 1, it looks like you have to add a library to the build to resolve the function call ost::IPV4Cidr::isMember(struct sockaddr const *)const. Possibly you are compiling with the wrong calling conventions for a library that you already included.
For the compile error in project buffer, you need to add the include path for that file cc++/buffer.h to the project.