Q_DECL_EXPORT int main(int argc, char **argv)
What does this Q_DECL_EXPORT before int main(...) means?
Answer
Excerpt from QT docs:
Depending on your target platform, Qt provides special macros that contain the necessary definitions:
- Q_DECL_EXPORT must be added to the declarations of symbols used when compiling a shared library.
- Q_DECL_IMPORT must be added to the declarations of symbols used when compiling a client that uses the shared library.
I haven't check the QT code, but most likely this macro will do following:
#ifdef _WIN32 || _WIN64
#define Q_DECL_EXPORT __declspec(dllexport)
#define Q_DECL_IMPORT __declspec(dllimport)
#else
#define Q_DECL_EXPORT
#define Q_DECL_IMPORT
#endif
__declspec(dllimport) and __declspec(dllexport) tells the linker to import and export (respectively) a symbol from or to a DLL. This is Windows specific.
In your particular case this macro probably could be removed, since main() most likely is not part of a library.