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https://issues.apache.org/jira/browse/XERCESC-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Bertoni resolved XERCESC-1855.
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Resolution: Invalid
Please do not create Jira issues to ask questions.
There is no bug in Xerces with regard to exporting user-defined classes derived
from Xerces-C classes. Xalan-C does this with no problems. Please make sure
you are using the __declspec(dllexport) directive correctly and that you're
linking with the appropriate DLL version of the Xerces-C library.
If you have more questions, please post a message to the user list with the
linker errors and the specifics of your Visual Studio compiler code-generation
and linker input settings.
> Export classes in a DLL drived from classes exported by Xerces causes linker
> errors
> -----------------------------------------------------------------------------------
>
> Key: XERCESC-1855
> URL: https://issues.apache.org/jira/browse/XERCESC-1855
> Project: Xerces-C++
> Issue Type: Bug
> Components: Build
> Affects Versions: 3.0.1
> Environment: Windows XP Visual Studio 2005
> Reporter: Andrea Richards
> Priority: Blocker
>
> We currently have a DLL which exports a couple of classes derived from
> Xerces. These are ContentSpecHandler and DTDElementDecl. When I try to export
> these classes from our DLL I get numerous linker errors despite including the
> both the lib files (which contain the correct signatures) and setting up the
> solutions dependancies. One example is shown below. I believe this to be a
> bug as it must be possible to derive a class from Xerces in a another DLL and
> then export it to be used by an EXE file, but this appears not to be the
> case. Do you have an answer or a working solution that will allow me to
> continue integration ? Thanks
> Andrea
> class LAD_EXPORT CXMLContentSpecNode : public ContentSpecNode
> {
> public:
> CXMLContentSpecNode(MemoryManager* const manager =
> XMLPlatformUtils::fgMemoryManager)
> : ContentSpecNode(manager), m_iElementId(-1) {};
> ...
> };
> Linker error :
> XMLInterface.obj : error LNK2001: unresolved external symbol "public: static
> class xercesc_3_0::MemoryManager *
> xercesc_3_0::XMLPlatformUtils::fgMemoryManager"
> (?fgmemorymana...@xmlplatformutils@xercesc_3_0@@2pavmemorymana...@2@A)
> Map file entry:
> 0004:00030c7c
> ?fgmemorymana...@xmlplatformutils@xercesc_3_0@@2pavmemorymana...@2@A 10552c7c
> PlatformUtils.obj
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