protobuf 3.2 + Qt + msvc 2013

[pokamest nikak]

Hi! I'm trying to build Qt app with protobuf 3.2.
Since Qt is dynamically linked I built protobuf as dll by configuring with

cmake -G "NMake Makefiles" ^
     -DCMAKE_BUILD_TYPE=Release ^
     -Dprotobuf_BUILD_SHARED_LIBS=ON ^
     -DCMAKE_INSTALL_PREFIX=../../../../install ^
     ../..

 Libs were included to Qt pro file

win32: LIBS += -L$$PWD/protobuf-windows-dynamic/lib/ -llibprotobuf

INCLUDEPATH += $$PWD/protobuf-windows-dynamic/include

DEPENDPATH += $$PWD/protobuf-windows-dynamic/include

When I build my Qt app I got next errors:

test.pb.obj:-1: ошибка: LNK2019: ссылка на неразрешенный внешний символ "private: static bool google::protobuf::io::CodedOutputStream::default_serialization_deterministic_" (?default_serialization_deterministic_@CodedOutputStream@io@protobuf@google@@0_NA) в функции "public: static bool __cdecl google::protobuf::io::CodedOutputStream::IsDefaultSerializationDeterministic(void)" (?IsDefaultSerializationDeterministic@CodedOutputStream@io@protobuf@google@@SA_NXZ)

 

 test.pb.obj:-1: ошибка: LNK2019: ссылка на неразрешенный внешний символ "class google::protobuf::internal::ExplicitlyConstructed<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > google::protobuf::internal::fixed_address_empty_string" (?fixed_address_empty_string@internal@protobuf@google@@3V?$ExplicitlyConstructed@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@123@A) в функции "public: __thiscall r::RouteList::RouteList(class r::RouteList const &)" (??0RouteList@r@@QAE@ABV01@@Z)

 As described in README

  Static linking is now the default for the Protocol Buffer libraries.  Due to
issues with Win32's use of a separate heap for each DLL, as well as binary
compatibility issues between different versions of MSVC's STL library, it is
recommended that you use static linkage only.  However, it is possible to
build libprotobuf and libprotoc as DLLs if you really want.  To do this,
do the following:

  * Add an additional flag `-Dprotobuf_BUILD_SHARED_LIBS=ON` when invoking cmake
  * Follow the same steps as described in the above section.
  * When compiling your project, make sure to `#define PROTOBUF_USE_DLLS`.

I tried to insert this #define string to several places, but #define hadn't have any effect.
The last attempt was I made is insert this string to test.pb.h file generated by protoc, and app was built successfully.

But *.pb.h is not a good place to make changes.
Tell me please, where is good place to insert #define PROTOBUF_USE_DLLS ?

[Bo Yang]

I think you should add #define PROTOBUF_USE_DLLS as a compiler flag. e.g., CXXFLAGS=-DPROTOBUF_USE_DLLS.

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[pokamest nikak]

No, it's not working

QMAKE_CXXFLAGS+= -DPROTOBUF_USE_DLLS

Really it working when I put this #define to .pb.h file, but this file will renewed after protoc execution


пятница, 17 февраля 2017 г., 18:33:48 UTC+3 пользователь pokamest nikak написал: