链接时C未定义的引用

2019年8月1日 217次阅读

我想知道是否有人能够帮助我,因为我已经在这两天抓了我的头.

我已经完成了编译,并尝试在linux上链接源代码获取未定义的引用

编译使用,

g++ -g
-I/u01/kasunt/workspace/corelibCORBA/include
-I/u01/kasunt/workspace/corelibCORBA/installed_components/include
-I/u01/kasunt/workspace/corelibCORBA/idl
-I/u01/kasunt/workspace/corelibCORBA/src/Server
-I/u01/kasunt/workspace/corelibCORBA/installed_components/idl
-I/u01/kasunt/workspace/corelibCORBA/installed_components/src/Server
-I/u01/kasunt/workspace/corelibCORBA/installed_components/imake
-DNARROWPROTO -I . -I/u01/kasunt/workspace/corelibCORBA/installed_components/include
-W -Wall -Wpointer-arith -pipe -D_POSIX_THREADS -D_POSIX_THREAD_SAFE_FUNCTIONS -g -O -I/u01/kasunt/workspace/corelibCORBA/include
-g -O -I/u01/kasunt/workspace/corelibCORBA/include
-fvisibility=hidden -fvisibility-inlines-hidden -DACE_GCC_HAS_TEMPLATE_INSTANTIATION_VISIBILITY_ATTRS=1
-W -Wall -Wpointer-arith -ggdb -pipe -Wall -g -D__linux__ -D__x86__ -rdynamic -D_REENTRANT -DTAO_HAS_INTERCEPTORS=0 -DTAO_HAS_VALUETYPE=1 -D_REENTRANT -DACE_HAS_AIO_CALLS -D_GNU_SOURCE -I/usr/local/ACE+TAO+CIAO-5.7.9/ACE_wrappers
-I/usr/local/ACE+TAO+CIAO-5.7.9/ACE_wrappers/TAO
-I/usr/local/ACE+TAO+CIAO-5.7.9/ACE_wrappers/TAO/orbsvcs
-DACE_HAS_EXCEPTIONS -D__ACE_INLINE__ -c -o TestSeqWrapper.o TestSeqWrapper.cpp

链接使用,

g++ -o TestSeqWrapper TestSeqWrapper.o
-g -L/u01/kasunt/workspace/corelibCORBA/lib
-L/u01/kasunt/workspace/corelibCORBA/installed_components/lib
-g -O -Wl,-E -L/usr/local/ACE+TAO+CIAO-5.7.9/ACE_wrappers/lib
-L/usr/local/ACE+TAO+CIAO-5.7.9/ACE_wrappers/lib
-L/usr/local/ACE+TAO+CIAO-5.7.9/ACE_wrappers/TAO/tao
-L/u01/kasunt/workspace/corelibCORBA/installed_components/idl
-lcorelibCORBA -lcorelibCORBA /u01/kasunt/workspace/corelibCORBA/installed_components/lib/corelibCORBA3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/CorbaController3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/EConcurrency3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/corelibLogger3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/LeakTracker3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/trace3r.lib
-lDefineTimeZone /u01/kasunt/workspace/corelibCORBA/installed_components/lib/timestamp3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/ApplConfig3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/appl3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/logstream3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/disklog3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/timeout3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/getpnam3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/config3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/strl3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/string3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/command3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/cmdargs3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/CppUtils3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/BuildTag3r.lib
/u01/kasunt/workspace/corelibCORBA/installed_components/lib/exception3r.lib
-lCorbaIdl -lTAO_Valuetype -lTAO_PortableServer -lTAO_IORTable -lTAO_AnyTypeCode -lTAO_CosEvent -lTAO_CosNaming -lTAO -lACE

TestSeqWrapper.o: In function `SeqWrapper':
/u01/kasunt/workspace/corelibCORBA/include/corelibCORBA/SeqWrapper.hpp:165: undefined reference to `ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T()'

做nm的库我可以看到包含上面的构造函数,

nm --demangle ../installed_components/lib/libCorbaIdl.so | grep "ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T"
000327ba t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T(ECONZ::Corba::ComboElementSeq_T const&)
000331c2 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T(unsigned int)
0002edb0 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T(unsigned int, unsigned int, ECONZ::Corba::ComboElement_T*, bool)
0002d768 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T()
00032e52 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T(ECONZ::Corba::ComboElementSeq_T const&)
0003172a t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T(unsigned int)
0002d8e0 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T(unsigned int, unsigned int, ECONZ::Corba::ComboElement_T*, bool)
0002d8a6 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T()

源代码上的违规行(第165行),SeqWrapper()：var_(new SequenceType),size_(0){}

部分代码,

template< typename SEQUENCE >
class SeqWrapper : CppUtils::NonCopy
{
public:
   typedef SEQUENCE SequenceType;
   typedef typename SequenceType::_var_type SequenceType_var;

   typedef typename ElementTypeOf<SequenceType_var>::ElementType ElementType;
   typedef typename ElementTypeOf<SequenceType_var>::ReturnType ReturnType;
   typedef typename ElementTypeOf<SequenceType_var>::ConstReturnType ConstReturnType;

private:
   SequenceType_var var_;
   CORBA::ULong size_;

  void expand_( CORBA::ULong size )
  {
     // NOTE: current implementation assumes size only increases by small increments
     if (size > var_->length()) {
        var_->length( (size < 16)? 16 : (size > 256? size+256 : 2*size-2) );
     }
  }

public:
   SeqWrapper() : var_( new SequenceType ), size_( 0 ) { }
   SeqWrapper( CORBA::ULong reserve ) : var_( new SequenceType( reserve ) ), size_( 0 ) { var_->length( reserve ); }
   SeqWrapper( SequenceType *ownSeq ) : var_( ownSeq ), size_( ownSeq->length() ) { }

.....

TestSeqWrapper.cpp的源代码(我删除了大部分不需要的东西,使其不那么混乱)

#include <iostream>
#include <CppUtils/StringHelpers.hpp>
#include <corelibCORBA/SeqWrapper.hpp>
#include <CorbaC.h>

using namespace std;

int main()
{
    ECONZ::Corba::SeqWrapper< ECONZ::Corba::StringSeq_T > seq;
}

您可以看到我在链接选项中指定了共享库(以粗体显示).我最初认为它可能是由于某种依赖,并将库标志移动到开头没有影响.

我很感激.

最佳答案 既然你说

nm --demangle ../installed_components/lib/libCorbaIdl.so
> 0002d768 t ECONZ::Corba::ComboElementSeq_T::ComboElementSeq_T()

这意味着ComboElementSeq_T()位于lib -lCorbaIdl中
如果未找到引用,则此库之后指定的库之一正在使用它：

> -lCorbaIdl -lTAO_Valuetype -lTAO_PortableServer -lTAO_IORTable
> -lTAO_AnyTypeCode -lTAO_CosEvent -lTAO_CosNaming -lTAO -lACE

因此,其中一个包含：TestSeqWrapper.o：在functionSeqWrapper’中

> -lTAO_Valuetype
> -lTAO_PortableServer
> -lTAO_IORTable
> -lTAO_AnyTypeCode
> -lTAO_CosEvent
> -lTAO_CosNaming
> -lTAO
> -lACE

见：GCC C++ Linker errors: Undefined reference to ‘vtable for XXX’, Undefined reference to ‘ClassName::ClassName()’

如果将所有库构建为共享库,那么这个问题就会消失.

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