Using QtJsonSerializer as a static library about qtjsonserializer HOT 2 CLOSED

As a workaround, I use the following call
qmake.exe DEFINES+="STATIC_QJSON_SERIALIZER"

I have the following local modification in qtjsonserializer_global.h

#if defined(STATIC_QJSON_SERIALIZER)
#define Q_JSONSERIALIZER_EXPORT
#else
#if defined(QT_BUILD_JSONSERIALIZER_LIB)
#define Q_JSONSERIALIZER_EXPORT Q_DECL_EXPORT
#else
#define Q_JSONSERIALIZER_EXPORT Q_DECL_IMPORT
#endif
#endif

Each static library consumer must define STATIC_QJSON_SERIALIZER.

from qtjsonserializer.

I am aware of the planned changes in build systems of the Qt Company. I am still using qmake as all official Qt modules are currenlty built with qmake as well. I need some of their internal tools to create "true" Qt modules. I will of course switch my projects to cmake once Qt officially performs this step as well.

Regarding the static part: I always though Qt would automatically define the Q_DECL_EXPORT and Q_DECL_IMPOR macros to be empty for static builds. After checking how qtbase handles this, I realised that was a false assumption. Taken from QtNetwork, the library export macros are defined as:

#ifndef QT_STATIC
#  if defined(QT_BUILD_NETWORK_LIB)
#    define Q_NETWORK_EXPORT Q_DECL_EXPORT
#  else
#    define Q_NETWORK_EXPORT Q_DECL_IMPORT
#  endif
#else
#  define Q_NETWORK_EXPORT
#endif

You can use the same as workround with Q_JSONSERIALIZER_EXPORT until I find the time to update the code base. This way you should be able to use the library statically without defining that extra macro in any consumer. I will keep the issue open until this was fixed in the code.

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