Unable to create DLL under VS15 2017 using CMake generated .sln

[rgcv]

I've managed to generate a Visual Studio solution through cmake via cmake -G "Visual Studio 15 2017 Win64, which worked apparently seamlessly. My objective was to produce a dll out of the hello world example in the readme, i.e., Boost's hello world.

However, once I try to build the project, linking errors start to pop up, along with some warnings mentioning some declarations "need(s) to have a dll-interface to be used by" some class.

Here's my CMakeLists.txt

cmake_minimum_required(VERSION 2.8.12)
project(HelloWorld)

find_package(JlCxx REQUIRED)

add_library(hello_world SHARED src/hello_world.cpp)
target_link_libraries(hello_world JlCxx::cxxwrap_julia ${Julia_LIBRARY})

install(TARGETS
  hello_world
LIBRARY DESTINATION lib
ARCHIVE DESTINATION lib
RUNTIME DESTINATION lib)

Build output in VS15 2017

1>------ Build started: Project: ZERO_CHECK, Configuration: Release x64 ------
2>------ Build started: Project: hello_world, Configuration: Release x64 ------
2>hello_world.cpp
2>c:\user\home\appdata\local\julia-1.0.2\include\julia\julia.h(871): warning C4146: unary minus operator applied to unsigned type, result still unsigned
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(567): warning C4251: 'jlcxx::Module::m_pointer_array': class 'jlcxx::ArrayRef<void *,1>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(567): note: see declaration of 'jlcxx::ArrayRef<void *,1>'
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(568): warning C4251: 'jlcxx::Module::m_functions': class 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(568): note: see declaration of 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(569): warning C4251: 'jlcxx::Module::m_jl_constants': class 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(569): note: see declaration of 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(570): warning C4251: 'jlcxx::Module::m_reference_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(85): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(571): warning C4251: 'jlcxx::Module::m_allocated_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(85): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(1085): warning C4251: 'jlcxx::ModuleRegistry::m_modules': class 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::ModuleRegistry'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>c:\user\home\.julia\packages\cxxwrap\kcmsi\deps\usr\include\jlcxx\module.hpp(1085): note: see declaration of 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>   Creating library Z:/Path/To/Proj/Release/hello_world.lib and object Z:/Path/To/Proj/Release/hello_world.exp
2>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __cdecl jlcxx::FunctionWrapperBase::~FunctionWrapperBase(void)" (__imp_??1FunctionWrapperBase@jlcxx@@UEAA@XZ) referenced in function "public: virtual void * __cdecl jlcxx::FunctionPtrWrapper<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::`scalar deleting destructor'(unsigned int)" (??_G?$FunctionPtrWrapper@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@$$V@jlcxx@@UEAAPEAXI@Z)
2>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl jlcxx::FunctionWrapperBase::set_name(struct _jl_value_t *)" (__imp_?set_name@FunctionWrapperBase@jlcxx@@QEAAXPEAU_jl_value_t@@@Z) referenced in function define_julia_module
2>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __cdecl jlcxx::FunctionWrapperBase::set_pointer_indices(void)" (__imp_?set_pointer_indices@FunctionWrapperBase@jlcxx@@IEAAXXZ) referenced in function define_julia_module
2>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl jlcxx::Module::append_function(class jlcxx::FunctionWrapperBase *)" (__imp_?append_function@Module@jlcxx@@QEAAXPEAVFunctionWrapperBase@2@@Z) referenced in function define_julia_module
2>C:\User\Home\source\repos\hello_world\Release\hello_world.dll : fatal error LNK1120: 4 unresolved externals
2>Done building project "hello_world.vcxproj" -- FAILED.
3>------ Build started: Project: ALL_BUILD, Configuration: Release x64 ------
4>------ Skipped Build: Project: INSTALL, Configuration: Release x64 ------
4>Project not selected to build for this solution configuration 
========== Build: 2 succeeded, 1 failed, 0 up-to-date, 1 skipped ==========

I'm not really sure what to do, I'm new to building DLLs, meaning I know nearly nothing about it. I've tried setting up a solution manually as well with no success found there. Hoping I'm just doing something silly and this actually has a dead obvious solution.

Also, my end goal, which might seem obvious, would be to have a codebase for the wrapper and be able to generate both shared objects and DLLs. Ultimately, if I could eventually get there, create a single shared library that would be generated and used upon package installation/compilation, for example. But that's another issue altogether.

[barche]

Can you try adding this before the add_library line in your CMake:

get_target_property(JlCxx_location JlCxx::cxxwrap_julia LOCATION)
get_filename_component(JlCxx_location ${JlCxx_location} DIRECTORY)
set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib;${JlCxx_location}")

Also, it should not be needed to explicitly link in the ${Julia_LIBRARY}, it is inherited from libcxxwrap-julia. Note that I tested on VS2015, I got a different error there, but adding the RPATH command fixed it.

[rgcv]

I figured I should clear up CMakeCache.txt and other build generated files and build from a fresh clean slate, with the addition of the appendage in the RPATH. Unfortunately, the issue persists :disappointed:

EDIT: Removed identical log transcript for brevity's sake.

EDIT: I've managed to observe an interesting change in behaviour regarding the warnings. Sometimes, after a build, VS picks up on file changes, prompts for a reload from disk, and the warnings disappear on a successive build, leaving only the linking errors, which, sadly, are the main issue here. The log is reduced to the following excerpt:

1>------ Build started: Project: hello_world, Configuration: Release x64 ------
1>   Creating library C:/Path/To/Project/Release/hello_world.lib and object C:/Path/To/Project/Release/hello_world.exp
1>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __cdecl jlcxx::FunctionWrapperBase::~FunctionWrapperBase(void)" (__imp_??1FunctionWrapperBase@jlcxx@@UEAA@XZ) referenced in function "public: virtual void * __cdecl jlcxx::FunctionPtrWrapper<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::`scalar deleting destructor'(unsigned int)" (??_G?$FunctionPtrWrapper@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@$$V@jlcxx@@UEAAPEAXI@Z)
1>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl jlcxx::FunctionWrapperBase::set_name(struct _jl_value_t *)" (__imp_?set_name@FunctionWrapperBase@jlcxx@@QEAAXPEAU_jl_value_t@@@Z) referenced in function define_julia_module
1>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) protected: void __cdecl jlcxx::FunctionWrapperBase::set_pointer_indices(void)" (__imp_?set_pointer_indices@FunctionWrapperBase@jlcxx@@IEAAXXZ) referenced in function define_julia_module
1>hello_world.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl jlcxx::Module::append_function(class jlcxx::FunctionWrapperBase *)" (__imp_?append_function@Module@jlcxx@@QEAAXPEAVFunctionWrapperBase@2@@Z) referenced in function define_julia_module
1>C:\Path\To\Project\Release\hello_world.dll : fatal error LNK1120: 4 unresolved externals
1>Done building project "hello_world.vcxproj" -- FAILED.
2>------ Skipped Build: Project: INSTALL, Configuration: Release x64 ------
2>Project not selected to build for this solution configuration 
========== Build: 0 succeeded, 1 failed, 2 up-to-date, 1 skipped ==========

[barche]

Just to be sure: could you post the full CMake configure stage output? You are building against a libcxxwrap-julia that is built using MSVC too, right?

[rgcv]

cmake_minimum_required(VERSION 2.8.12)
project(hello_world)
include(.env.cmake) # sets JlCxx_DIR

find_package(JlCxx)

get_target_property(JlCxx_location JlCxx::cxxwrap_julia LOCATION)
get_filename_component(JlCxx_location ${JlCxx_location} DIRECTORY)
set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib;${JlCxx_location}")

add_library(hello_world SHARED src/hello_world.cpp)
target_link_libraries(hello_world JlCxx::cxxwrap_julia)

install(TARGETS
  hello_world
LIBRARY DESTINATION lib
ARCHIVE DESTINATION lib
RUNTIME DESTINATION lib)

I'm assuming as much, yes. The libcxxwrap-julia bins I'm using were installed with CxxWrap when I added the package, which I assume compiles the lib upon addition using the target machine's compiler toolchain (in case of Windows, MSVC).

[barche]

Aha, no, it doesn't in fact, standard behavior now is to download the cross-compiled (mingw) binaries. This explains all your trouble. The best way forward is to compile libcxxwrap-julia from source, set the JLCXX_DIR environment variable in Julia to the build directory (the dir containing the JlCxxConfig.cmake file) and then Pkg.build CxxWrap again.

[rgcv]

That.. does make sense, woops.. I'm guessing CxxWrap's README should include a note then, maybe? Warning not to develop the wrapper code using the libs and includes that come bundled with it when using Visual Studio, I suppose. Maybe, might be wrong on that one.

Definitely good to know the best way for developing wrapper code going forward :+1:

[rgcv]

Issue's been resolved, I'll be closing this now. Thanks for the support! :smiley:

[Petr-Hlavenka]

@barche Thank you from pointing me from JuliaInterop/CxxWrap.jl#29 According to your advice I'm trying to compile the libcxxwrap-julia library using cmake with MSVC2017 toolchain. I think I see a linker mismatch between the julia libraries (1.1.0 official binary win64 installer) that use the C calling convention with exported function names, e.g. jl_get_ptls_states but the linker looks for a function decorated as __imp__jl_get_ptls_states. Is there something at the side of cmake that fixes this issue? cmake output:

Found Julia executable: C:/Users/petr.hlavenka/AppData/Local/Julia-1.1.0/bin/julia.exe
Julia_VERSION_STRING: 1.1.0
Julia_INCLUDE_DIRS:   C:\\Users\\petr.hlavenka\\AppData\\Local\\Julia-1.1.0\\include\\julia
Julia_LIBRARY_DIR:    C:\\Users\\petr.hlavenka\\AppData\\Local\\Julia-1.1.0\\bin
Julia_LIBRARY:        C:/Users/petr.hlavenka/AppData/Local/Julia-1.1.0/lib/libjulia.dll.a
JULIA_HOME:           C:\\Users\\petr.hlavenka\\AppData\\Local\\Julia-1.1.0\\bin
Julia_LLVM_VERSION:   v6.0.1
Julia_WORD_SIZE:      64
JlCxx version: v0.5.3
Configuring done
Generating done

Compilation output:

1>------ Rebuild All started: Project: ZERO_CHECK, Configuration: Debug Win32 ------
1>Checking Build System
1>CMake does not need to re-run because C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/build/CMakeFiles/generate.stamp is up-to-date.
1>CMake does not need to re-run because C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/build/examples/CMakeFiles/generate.stamp is up-to-date.
1>CMake does not need to re-run because C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/build/test/CMakeFiles/generate.stamp is up-to-date.
2>------ Rebuild All started: Project: cxxwrap_julia, Configuration: Debug Win32 ------
2>Building Custom Rule C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/CMakeLists.txt
2>CMake does not need to re-run because C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/build/CMakeFiles/generate.stamp is up-to-date.
2>c_interface.cpp
2>C:\Program Files (x86)\Windows Kits\10\Include\10.0.17134.0\ucrt\signal.h(22): warning C4005: 'NSIG': macro redefinition
2>c:\users\petr.hlavenka\appdata\local\julia-1.1.0\include\julia\uv/win.h(67): note: see previous definition of 'NSIG'
2>C:\Users\petr.hlavenka\AppData\Local\Julia-1.1.0\include\julia\julia.h(892): warning C4146: unary minus operator applied to unsigned type, result still unsigned
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(585): warning C4251: 'jlcxx::Module::m_pointer_array': class 'jlcxx::ArrayRef<void *,1>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(585): note: see declaration of 'jlcxx::ArrayRef<void *,1>'
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(586): warning C4251: 'jlcxx::Module::m_functions': class 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(586): note: see declaration of 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(587): warning C4251: 'jlcxx::Module::m_jl_constants': class 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(587): note: see declaration of 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(588): warning C4251: 'jlcxx::Module::m_reference_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(85): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(589): warning C4251: 'jlcxx::Module::m_allocated_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(85): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(1105): warning C4251: 'jlcxx::ModuleRegistry::m_modules': class 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::ModuleRegistry'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(1105): note: see declaration of 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\src\c_interface.cpp(17): warning C4297: 'initialize': function assumed not to throw an exception but does
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\src\c_interface.cpp(17): note: The function is extern "C" and /EHc was specified
2>jlcxx.cpp
2>C:\Program Files (x86)\Windows Kits\10\Include\10.0.17134.0\ucrt\signal.h(22): warning C4005: 'NSIG': macro redefinition
2>c:\users\petr.hlavenka\appdata\local\julia-1.1.0\include\julia\uv/win.h(67): note: see previous definition of 'NSIG'
2>C:\Users\petr.hlavenka\AppData\Local\Julia-1.1.0\include\julia\julia.h(892): warning C4146: unary minus operator applied to unsigned type, result still unsigned
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(585): warning C4251: 'jlcxx::Module::m_pointer_array': class 'jlcxx::ArrayRef<void *,1>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(585): note: see declaration of 'jlcxx::ArrayRef<void *,1>'
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(586): warning C4251: 'jlcxx::Module::m_functions': class 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(586): note: see declaration of 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(587): warning C4251: 'jlcxx::Module::m_jl_constants': class 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(587): note: see declaration of 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(588): warning C4251: 'jlcxx::Module::m_reference_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(85): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(589): warning C4251: 'jlcxx::Module::m_allocated_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(85): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(1105): warning C4251: 'jlcxx::ModuleRegistry::m_modules': class 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::ModuleRegistry'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>c:\users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx\module.hpp(1105): note: see declaration of 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>functions.cpp
2>C:\Program Files (x86)\Windows Kits\10\Include\10.0.17134.0\ucrt\signal.h(22): warning C4005: 'NSIG': macro redefinition
2>c:\users\petr.hlavenka\appdata\local\julia-1.1.0\include\julia\uv/win.h(67): note: see previous definition of 'NSIG'
2>C:\Users\petr.hlavenka\AppData\Local\Julia-1.1.0\include\julia\julia.h(892): warning C4146: unary minus operator applied to unsigned type, result still unsigned
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(585): warning C4251: 'jlcxx::Module::m_pointer_array': class 'jlcxx::ArrayRef<void *,1>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(585): note: see declaration of 'jlcxx::ArrayRef<void *,1>'
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(586): warning C4251: 'jlcxx::Module::m_functions': class 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(586): note: see declaration of 'std::vector<std::shared_ptr<jlcxx::FunctionWrapperBase>,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=std::shared_ptr<jlcxx::FunctionWrapperBase>
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(587): warning C4251: 'jlcxx::Module::m_jl_constants': class 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(587): note: see declaration of 'std::map<std::string,jl_value_t *,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=std::string,
2>            _Ty=jl_value_t *
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(588): warning C4251: 'jlcxx::Module::m_reference_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/functions.hpp(146): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(589): warning C4251: 'jlcxx::Module::m_allocated_types': class 'std::vector<jl_datatype_t *,std::allocator<_Ty>>' needs to have dll-interface to be used by clients of class 'jlcxx::Module'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/functions.hpp(146): note: see declaration of 'std::vector<jl_datatype_t *,std::allocator<_Ty>>'
2>        with
2>        [
2>            _Ty=jl_datatype_t *
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(1105): warning C4251: 'jlcxx::ModuleRegistry::m_modules': class 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>' needs to have dll-interface to be used by clients of class 'jlcxx::ModuleRegistry'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\include\jlcxx/module.hpp(1105): note: see declaration of 'std::map<jl_module_t *,std::shared_ptr<jlcxx::Module>,std::less<_Kty>,std::allocator<std::pair<const _Kty,_Ty>>>'
2>        with
2>        [
2>            _Kty=jl_module_t *,
2>            _Ty=std::shared_ptr<jlcxx::Module>
2>        ]
2>Generating Code...
2>   Creating library C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/build/Debug/cxxwrap_julia.lib and object C:/Users/petr.hlavenka/source/repos/libcxxwrap-julia/build/Debug/cxxwrap_julia.exp
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_get_ptls_states referenced in function __catch$_register_julia_module$0
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_get_ptls_states
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_new_struct referenced in function "public: void __thiscall <lambda_fe7ccfb74fc10f03cc5120c6aa54d4ad>::operator()(class jlcxx::FunctionWrapperBase &)const " (??R<lambda_fe7ccfb74fc10f03cc5120c6aa54d4ad>@@QBEXAAVFunctionWrapperBase@jlcxx@@@Z)
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_box_int32 referenced in function "struct _jl_value_t * __cdecl jlcxx::box<int>(int const &)" (??$box@H@jlcxx@@YAPAU_jl_value_t@@ABH@Z)
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_box_int32
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_alloc_array_1d referenced in function "public: __thiscall jlcxx::Array<struct _jl_datatype_t *>::Array<struct _jl_datatype_t *>(unsigned int)" (??0?$Array@PAU_jl_datatype_t@@@jlcxx@@QAE@I@Z)
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_arrayset referenced in function "public: void __thiscall jlcxx::Array<struct _jl_datatype_t *>::push_back(struct _jl_datatype_t * const &)" (?push_back@?$Array@PAU_jl_datatype_t@@@jlcxx@@QAEXABQAU_jl_datatype_t@@@Z)
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_arrayset
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_array_grow_end referenced in function "public: void __thiscall jlcxx::Array<struct _jl_datatype_t *>::push_back(struct _jl_datatype_t * const &)" (?push_back@?$Array@PAU_jl_datatype_t@@@jlcxx@@QAEXABQAU_jl_datatype_t@@@Z)
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_array_grow_end
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_apply_array_type referenced in function "struct _jl_value_t * __cdecl jlcxx::apply_array_type<struct _jl_datatype_t>(struct _jl_datatype_t *,unsigned int)" (??$apply_array_type@U_jl_datatype_t@@@jlcxx@@YAPAU_jl_value_t@@PAU_jl_datatype_t@@I@Z)
2>c_interface.obj : error LNK2019: unresolved external symbol __imp__jl_error referenced in function __catch$_register_julia_module$0
2>c_interface.obj : error LNK2001: unresolved external symbol __imp__jl_datatype_type
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_datatype_type
2>functions.obj : error LNK2001: unresolved external symbol __imp__jl_datatype_type
2>c_interface.obj : error LNK2001: unresolved external symbol __imp__jl_any_type
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_typename_str referenced in function "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl jlcxx::julia_type_name(struct _jl_value_t *)" (?julia_type_name@jlcxx@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAU_jl_value_t@@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_apply_type referenced in function "struct _jl_value_t * __cdecl jlcxx::apply_type(struct _jl_value_t *,struct jl_svec_t *)" (?apply_type@jlcxx@@YAPAU_jl_value_t@@PAU2@PAUjl_svec_t@@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_new_datatype referenced in function "struct _jl_datatype_t * __cdecl jlcxx::new_datatype(struct _jl_sym_t *,struct _jl_module_t *,struct _jl_datatype_t *,struct jl_svec_t *,struct jl_svec_t *,struct jl_svec_t *,int,int,int)" (?new_datatype@jlcxx@@YAPAU_jl_datatype_t@@PAU_jl_sym_t@@PAU_jl_module_t@@PAU2@PAUjl_svec_t@@33HHH@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_new_primitivetype referenced in function "struct _jl_datatype_t * __cdecl jlcxx::new_bitstype(struct _jl_sym_t *,struct _jl_module_t *,struct _jl_datatype_t *,struct jl_svec_t *,unsigned int)" (?new_bitstype@jlcxx@@YAPAU_jl_datatype_t@@PAU_jl_sym_t@@PAU_jl_module_t@@PAU2@PAUjl_svec_t@@I@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_new_bits referenced in function "struct _jl_value_t * __cdecl jlcxx::box<wchar_t const >(wchar_t const * const &)" (??$box@$$CB_W@jlcxx@@YAPAU_jl_value_t@@ABQB_W@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_svec1 referenced in function "public: static struct _jl_datatype_t * __cdecl jlcxx::static_type_mapping<wchar_t *,void>::julia_type(void)" (?julia_type@?$static_type_mapping@PA_WX@jlcxx@@SAPAU_jl_datatype_t@@XZ)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_symbol referenced in function _jl_get_function
2>functions.obj : error LNK2001: unresolved external symbol __imp__jl_symbol
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_get_global referenced in function _jl_get_function
2>functions.obj : error LNK2001: unresolved external symbol __imp__jl_get_global
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_set_const referenced in function "public: void __thiscall jlcxx::Module::bind_constants(struct _jl_module_t *)" (?bind_constants@Module@jlcxx@@QAEXPAU_jl_module_t@@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_exception_occurred referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_call referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_call2 referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_printf referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_stderr_stream referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jl_stderr_obj referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2019: unresolved external symbol __imp__jlbacktrace referenced in function "public: struct _jl_value_t * __thiscall jlcxx::JuliaFunction::operator()<struct _jl_value_t * &>(struct _jl_value_t * &)const " (??$?RAAPAU_jl_value_t@@@JuliaFunction@jlcxx@@QBEPAU_jl_value_t@@AAPAU2@@Z)
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_unionall_type
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_voidpointer_type
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_pointer_type
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_main_module
2>functions.obj : error LNK2001: unresolved external symbol __imp__jl_main_module
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_base_module
2>jlcxx.obj : error LNK2001: unresolved external symbol __imp__jl_top_module
2>C:\Users\petr.hlavenka\AppData\Local\Julia-1.1.0\lib\libjulia.dll.a : warning LNK4272: library machine type 'x64' conflicts with target machine type 'x86'
2>C:\Users\petr.hlavenka\source\repos\libcxxwrap-julia\build\Debug\cxxwrap_julia.dll : fatal error LNK1120: 32 unresolved externals
2>Done building project "cxxwrap_julia.vcxproj" -- FAILED.
========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========

[barche]

@phlavenk I have updated the build instructions for MSVC on the main libcxxwrap readme, though it is only tested on MSVC2019, probably C++17 support is too limited on MSVC2017 to compile the lates version.

[Petr-Hlavenka]

@barche you are the king! And I'm also amazed by the MSVC2019 integration of cmake - finally it is super easy to compile cmake-made code. Thank you again for this great work.

[barche]

Thanks, glad to hear it's working :)