building sample plugin

[mcj]

I am trying to build the sample plugin described in "Building a GMAT Plug-in: A Walkthrough Using Visual Studio 2010". I have the project set up as described in the document, but after updating the project's include directories, the build still fails with several inconsistent dll linkage warnings and the following error:

> ..\..\src\command\ConsolePrint.cpp(88): error C2259: 'GmatCommand' : cannot instantiate abstract class due to following members:
> 'bool GmatBase::RenameRefObject(const Gmat::ObjectType,const std::string &,const std::string &)' : is abstract
> ..\..\..\..\GmatDevelopment\src\base\foundation\GmatBase.hpp(126) : see declaration of 'GmatBase::RenameRefObject'
> 'GmatBase *GmatBase::Clone(void) const' : is abstract
> ..\..\..\..\GmatDevelopment\src\base\foundation\GmatBase.hpp(171) : see declaration of 'GmatBase::Clone'
> 'bool GmatBase::HasLocalClones(void)' : is abstract
> ..\..\..\..\GmatDevelopment\src\base\foundation\GmatBase.hpp(461) : see declaration of 'GmatBase::HasLocalClones'
> 'bool GmatCommand::Execute(void)' : is abstract
> ..\..\..\..\GmatDevelopment\src\base\command\GmatCommand.hpp(201) : see declaration of 'GmatCommand::Execute'

Any idea as to what the problem is here?

Thanks.

[DJCinSB]

Before starting: Are you building the Release version? If you build debug, you'll get the inconsistent dll linkage messages.

Assuming that part is okay: I can't quite tell where the issue is from the messages you posted. I just did a quick check on the code at svn://svn.code.sf.net/p/gmatplugins/code/trunk, and it seems to be okay with the current code base. Please post your ConsolePrint code files (the .cpp and .hpp files) so I can take a look at them.

Other questions:
Are you using the current GMAT source code, or something else?
What platform are you building on (Windows, Mac, Linux)? I'm assuming Windows since the instructions are written for VS2010, but want to be sure.

[mcj]

Yes, I am building the Release version.

I had trouble with the svn client when accessing svn://svn.code.sf.net/p/gmatplugins/code/trunk (I believe it may be a firewall issue), so I used https://gmat.svn.sourceforge.net/svnroo ... ins/trunk/ instead.

I am using the current GMAT source code (as of Monday) and building on Windows with VS2010.

[DJCinSB]

When I use the code you supplied, I see the same issues. It looks like some of the code was garbled there -- for example, in the ConsolePrint assignment operator I see this:

Code: Select all

ConsolePrint & ConsolePrint::operator=(const ConsolePrint &cp)
{
   if (this != &cp)
   {
      GmatCommand operator=(cp)
   }
   
   return *this;
}

where it should be this:

Code: Select all

ConsolePrint & ConsolePrint::operator=(const ConsolePrint &cp)
{
   if (this != &cp)
   {
      GmatCommand::operator=(cp);
   }
   
   return *this;
}

(Notice the missing the "::" and trailing semicolon in this block.) So I poked around a bit with the current code in the repository; the code there is a bit different from yours. I'm attaching the current files from the repository. Please try these and let me know if they fix the issues you are seeing.

ConsolePrint.hpp

Header file

(1.92 KiB) Downloaded 269 times

ConsolePrint.cpp

Source file

(9.91 KiB) Downloaded 262 times

[mcj]

The updated code eliminated the error. However, there are still linking errors. I noticed the earlier discussion at http://gmat.ed-pages.com/forum/viewtopic.php?f=2&t=43552#p45136, and the error report from my build looks almost identical. From the earlier discussion, adding _DYNAMICLINK and PRINT_EXPORTS to the list of preprocessor definitions resolved the issue. However, even though these two definitions are included in my project, I still have the following warnings/errors:


1> ConsolePrint.cpp
1>..\..\src\command\ConsolePrint.cpp(40): warning C4273: 'ConsolePrint::ConsolePrint' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(32) : see previous definition of '{ctor}'
1>..\..\src\command\ConsolePrint.cpp(54): warning C4273: 'ConsolePrint::~ConsolePrint' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(33) : see previous definition of '{dtor}'
1>..\..\src\command\ConsolePrint.cpp(67): warning C4273: 'ConsolePrint::ConsolePrint' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(34) : see previous definition of '{ctor}'
1>..\..\src\command\ConsolePrint.cpp(85): warning C4273: 'ConsolePrint::operator =' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(35) : see previous definition of '='
1>..\..\src\command\ConsolePrint.cpp(103): warning C4273: 'ConsolePrint::Clone' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(37) : see previous definition of 'Clone'
1>..\..\src\command\ConsolePrint.cpp(130): warning C4273: 'ConsolePrint::InterpretAction' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(38) : see previous definition of 'InterpretAction'
1>..\..\src\command\ConsolePrint.cpp(167): warning C4273: 'ConsolePrint::Initialize' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(42) : see previous definition of 'Initialize'
1>..\..\src\command\ConsolePrint.cpp(220): warning C4273: 'ConsolePrint::Execute' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(43) : see previous definition of 'Execute'
1>..\..\src\command\ConsolePrint.cpp(243): warning C4273: 'ConsolePrint::RunComplete' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(44) : see previous definition of 'RunComplete'
1>..\..\src\command\ConsolePrint.cpp(257): warning C4273: 'ConsolePrint::BuildReferences' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(59) : see previous definition of 'BuildReferences'
1>..\..\src\command\ConsolePrint.cpp(289): warning C4273: 'ConsolePrint::GetData' : inconsistent dll linkage
1> ..\..\src\command\ConsolePrint.hpp(60) : see previous definition of 'GetData'
1>
1> SampleFactory.cpp
1>..\..\src\factory\SampleFactory.cpp(35): warning C4273: 'SampleFactory::SampleFactory' : inconsistent dll linkage
1> ..\..\src\factory\SampleFactory.hpp(41) : see previous definition of '{ctor}'
1>..\..\src\factory\SampleFactory.cpp(55): warning C4273: 'SampleFactory::~SampleFactory' : inconsistent dll linkage
1> ..\..\src\factory\SampleFactory.hpp(42) : see previous definition of '{dtor}'
1>..\..\src\factory\SampleFactory.cpp(68): warning C4273: 'SampleFactory::SampleFactory' : inconsistent dll linkage
1> ..\..\src\factory\SampleFactory.hpp(43) : see previous definition of '{ctor}'
1>..\..\src\factory\SampleFactory.cpp(93): warning C4273: 'SampleFactory::operator =' : inconsistent dll linkage
1> ..\..\src\factory\SampleFactory.hpp(44) : see previous definition of '='
1>..\..\src\factory\SampleFactory.cpp(128): warning C4273: 'SampleFactory::CreateCommand' : inconsistent dll linkage
1> ..\..\src\factory\SampleFactory.hpp(78) : see previous definition of 'CreateCommand'
1>
1> GmatPluginFunctions.cpp
1>..\..\src\plugin\GmatPluginFunctions.cpp(39): warning C4273: 'GetFactoryCount' : inconsistent dll linkage
1> ..\..\src\plugin\GmatPluginFunctions.hpp(28) : see previous definition of 'GetFactoryCount'
1>..\..\src\plugin\GmatPluginFunctions.cpp(56): warning C4273: 'GetFactoryPointer' : inconsistent dll linkage
1> ..\..\src\plugin\GmatPluginFunctions.hpp(29) : see previous definition of 'GetFactoryPointer'
1>..\..\src\plugin\GmatPluginFunctions.cpp(85): warning C4273: 'SetMessageReceiver' : inconsistent dll linkage
1> ..\..\src\plugin\GmatPluginFunctions.hpp(30) : see previous definition of 'SetMessageReceiver'
1>
1> Creating library ..\..\..\..\GmatDevelopment\application\plugins\libConsolePrint.lib and object ..\..\..\..\GmatDevelopment\application\plugins\libConsolePrint.exp
1>
1>ConsolePrint.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) const ConsolePrint::`vftable'" (__imp_??_7ConsolePrint@@6B@)
1>ConsolePrint.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual bool __thiscall ConsolePrint::RenameRefObject(enum Gmat::ObjectType,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (__imp_?RenameRefObject@ConsolePrint@@UAE_NW4ObjectType@Gmat@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@1@Z)
1>ConsolePrint.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual bool __thiscall ConsolePrint::HasLocalClones(void)" (__imp_?HasLocalClones@ConsolePrint@@UAE_NXZ)
1>SampleFactory.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) const SampleFactory::`vftable'" (__imp_??_7SampleFactory@@6B@)

[DJCinSB]

The declspec settings are made in the SampleDefs.hpp header file. Your project settings should match the settings in that file. If the file reads

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   #ifdef _DYNAMICLINK  // Only used for Visual C++ Windows DLLs
      #ifdef SAMPLE_EXPORTS
         #define SAMPLE_API __declspec(dllexport)
      #else
         #define SAMPLE_API __declspec(dllimport)
      #endif


then you need the preprocessor settings to define the macros _DYNAMICLINK and SAMPLE_EXPORTS, because these preprocessor declarations determine the DLL import/export linkage settings. Check your header file to see if it matches what I pasted above, but if I'm reading what you did correctly and if your header matches mine, you ought to define SAMPLE_EXPORTS rather than PRINT_EXPORTS. Try that, and let me know.

[mcj]

The declspec settings were correct in SampleDefs.hpp, but SAMPLE_EXPORTS was not specified in the project's preprocessor settings. After defining SAMPLE_EXPORTS, the project built successfully.

Thanks for the input.