Unable to statically link OpenCV without OpenCL support on windows.

[CeNiEi]

i have been experimenting with the crate, and found that if i disable OpenCL when compiling the static lib files of OpenCV, i am unable to link it correctly to my app.
I get the following link error:

          libopencv-3b3b70e538e42495.rlib(8cdb024d75981777-core.o) : error LNK2019: unresolved external symbol "public: bool __cdecl cv::ocl::Kernel::run_(int,unsigned __int64 * const,unsigned __int64 * const,bool,class cv::ocl::Queue const &)" (?run_@Kernel@ocl@cv@@QEAA_NHQEA_K0_NAEBVQueue@23@@Z) referenced in function cv_ocl_Kernel_run__int_size_tX_size_tX_bool_const_QueueR
          libopencv-3b3b70e538e42495.rlib(8cdb024d75981777-core.o) : error LNK2019: unresolved external symbol "public: int __cdecl cv::ocl::PlatformInfo::versionMajor(void)const " (?versionMajor@PlatformInfo@ocl@cv@@QEBAHXZ) referenced in function cv_ocl_PlatformInfo_versionMajor_const
          libopencv-3b3b70e538e42495.rlib(8cdb024d75981777-core.o) : error LNK2019: unresolved external symbol "public: int __cdecl cv::ocl::PlatformInfo::versionMinor(void)const " (?versionMinor@PlatformInfo@ocl@cv@@QEBAHXZ) referenced in function cv_ocl_PlatformInfo_versionMinor_const
          libopencv-3b3b70e538e42495.rlib(8cdb024d75981777-core.o) : error LNK2019: unresolved external symbol "char const * __cdecl cv::ocl::convertTypeStr(int,int,int,char *,unsigned __int64)" (?convertTypeStr@ocl@cv@@YAPEBDHHHPEAD_K@Z) referenced in function cv_ocl_convertTypeStr_int_int_int_charX_size_t
          C:\Users\ryuji\unicorns\cvwin\target\debug\deps\cvwin.exe : fatal error LNK1120: 4 unresolved externals

I am not sure why OpenCL symbols are being generated in the first place, since i set the WITH_OPENCL flag to OFF, when compiling OpenCV? Any clues what might be happening here?

I am not sure, if the output of cargo b -vv would be helpful here, but i am more than happy to provide it, if need be.

[twistedfall]

Do you still have this issue? If so cargo build -vv is always useful to provide the insight into what's happening during binding generation. Please also be sure to use the latest crate version (0.90.0 at the moment of writing)

[PaulWagener]

I also just ran into this issue with the latest version (0.94.1)
For reference I was using the following vcpkg configuration:

[package.metadata.vcpkg]
git = "https://github.com/microsoft/vcpkg"
rev = "c7961da7380ecdb92242c9dbc8ee1bca2105e335"
dependencies = ["llvm", "opencv4[contrib,nonfree]", "proj", "gdal"]

[package.metadata.vcpkg.target]
x86_64-pc-windows-msvc = { triplet = "x64-windows-static-release" }

Changing the OpenCV dependency to opencv4[contrib,nonfree,opencl] solved this issue for me. Though it would be nice if this was optional.

[twistedfall]

Thanks for the update, is there any chance you can test the alpha branch with vcpkg built without OpenCL and see if it works for you now?

[twistedfall]

This should now be fixed in 0.94.2