Mingw-32bit Vs MSVC2013-64bit Shared library issue

[Vikram.Saralaya]

Hello,

I have a shared library that works perfectly with mingw-32bit compiler. On MSVC2013-64bit compiler however I get a strange problem.

unresolved external symbol *__declspec(dllimport) .....

unresolved external symbol *__declspec(dllimport) .....

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The problem is caused by a class in my shared library that is defined as:

class TEST_IMPORT_EXPORT className { .... }

class TEST_IMPORT_EXPORT className { .... }

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TEST_IMPORT_EXPORT is defined as :

#ifdef BUILD_TEST_DLL
#define TEST_IMPORT_EXPORT Q_DECL_EXPORT
#else
#define TEST_IMPORT_EXPORT Q_DECL_IMPORT
#endif

#ifdef BUILD_TEST_DLL
#define TEST_IMPORT_EXPORT Q_DECL_EXPORT
#else
#define TEST_IMPORT_EXPORT Q_DECL_IMPORT
#endif

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I was wondering why the error says something about "dllImport" so I changed class definition to

class Q_DECL_EXPORT className { .... }

class Q_DECL_EXPORT className { .... }

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and the MSVC2013-64bit works fine!

But I for sure think its not the right way to fix this issue. Can someone provide me more info as to what might be going on here?!

Thanks

Regards
Vikram

[anda_skoa]

Have you checked that BUILD_TEST_DLL is set when you are building the library?

Cheers,
_

[Vikram.Saralaya]

Aparently the first thing I did was that! It is set for sure..

[ChrisW67]

On Windows you have this coming from Qt:

#    define Q_DECL_EXPORT __declspec(dllexport)
#    define Q_DECL_IMPORT __declspec(dllimport)

#    define Q_DECL_EXPORT __declspec(dllexport)
#    define Q_DECL_IMPORT __declspec(dllimport)

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as you can see, you ended up with the value of Q_DECL_IMPORT, which can only mean that your code:

#ifdef BUILD_TEST_DLL
#define TEST_IMPORT_EXPORT Q_DECL_EXPORT
#else
#define TEST_IMPORT_EXPORT Q_DECL_IMPORT
#endif

#ifdef BUILD_TEST_DLL
#define TEST_IMPORT_EXPORT Q_DECL_EXPORT
#else
#define TEST_IMPORT_EXPORT Q_DECL_IMPORT
#endif

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was preprocessed when BUILD_TEST_DLL was not defined.

If you add BUILD_TEST_DLL in your PRO file DEFINES, then you must rerun qmake to rewrite the Makefile or the value will not make it to the compiler.