I had a look at the edyuk's svn link to qcumber posted by fullmetalcoder and found these (@fullmetalcoder: Hope you don't mind me posting this here )

Qt Code: 
  1. #ifdef _QCUMBER_BUILD_
  2. 	#if (defined(QT_DLL) || defined(QT_SHARED)) && !defined(QT_PLUGIN)
  3. 		#define QCUMBER_EXPORT Q_DECL_EXPORT
  4. 	#else
  5. 		#define QCUMBER_EXPORT
  6. 	#endif
  7. #else
  8. 		#define QCUMBER_EXPORT Q_DECL_IMPORT
  9. #endif
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I didn't understand this and tried searching in assistant for definition of Q_DECL_EXPORT and IMPORT but in vain. Then i looked at qglobal.h and found these macros defined to one of these based on some variable
Qt Code: 
  1. __declspec(dllexport),__attribute__((visibility("default"))),__declspec(dllimport)
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Again i didn't understand. Googling didn't help much either since i don't even know the basics of this.
Can someone help me understand this clearly ?
And also can you tell me how this macro helps when used like this ?
Qt Code: 
  1. class Q_DECL_EXPORT SomeClass : BaseClass
  2. {
  3. ..
  4. };
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Finally (probably to fullmetalcoder)
Why is the QCUMBER_EXPORT defined to be Q_DECL_IMPORT ? (export - import )