Building custom MKL dll, unresolved external symbols

Weeks__John — Fri, 06 Nov 2020 00:49:12 GMT

Building a custom MKL dll using Visual studio 2019 and MKL 2020 update 2. The example solution builds fine.

I edited the list of functions in example.def to my list of application unresolved symbols, as described in the MKL doc. I changed the Linker->Input Additional Dependencies from mkl_intel_lp64.lib to mkl_intel_ilp64.lib.

Building now gives me two unresolved external symbols. Here are the error outputs:

Error LNK2019 unresolved external symbol _FDtest referenced in function "protected: void __cdecl mkl_blas_jit_gemm_t<class std::complex<float>,struct mkl_serv_Xbyak::Reg64>::gemm(struct mkl_blas_jit_gemm_strategy &,struct mkl_blas_jit_gemm_state &,bool)" (?gemm@?$mkl_blas_jit_gemm_t@V?$complex@M@std@@UReg64@mkl_serv_Xbyak@@@@IEAAXAEAUmkl_blas_jit_gemm_strategy@@AEAUmkl_blas_jit_gemm_state@@_N@Z) lp64_parallel C:\Users\John\Documents\Development\Igor9\CustomMKLDll\lp64_parallel\mkl_core.lib(_jit_gemm_kernel_generator_fb.obj) 1 Error LNK2019 unresolved external symbol _Dtest referenced in function "protected: void __cdecl mkl_blas_jit_gemm_t<class std::complex<double>,struct mkl_serv_Xbyak::Reg64>::gemm(struct mkl_blas_jit_gemm_strategy &,struct mkl_blas_jit_gemm_state &,bool)" (?gemm@?$mkl_blas_jit_gemm_t@V?$complex@N@std@@UReg64@mkl_serv_Xbyak@@@@IEAAXAEAUmkl_blas_jit_gemm_strategy@@AEAUmkl_blas_jit_gemm_state@@_N@Z) lp64_parallel C:\Users\John\Documents\Development\Igor9\CustomMKLDll\lp64_parallel\mkl_core.lib(_jit_gemm_kernel_generator_fb.obj) 1 Error LNK1120 2 unresolved externals lp64_parallel C:\Users\John\Documents\Development\Igor9\CustomMKLDll\x64\Debug\CustomMKL64d.dll 1

_Dtest and _FDtest are part of the Visual C runtime, so surely one of these additional dependencies has those functions:

mkl_intel_ilp64.lib;mkl_intel_thread.lib;mkl_core.lib;libiomp5md.lib;msvcrt.lib;vcruntime.lib;ucrt.lib;kernel32.lib;user32.lib

Naturally, the mkl_xxx libraries are irrelevant; that's just the complete list. I would have expected ucrt.lib to have those symbols, though.

I tried Googling those symbols- I can get documentation, but not a mention of what library to include.

Any insights appreciated!

Re: Building custom MKL dll, unresolved external symbols

mecej4 — Fri, 06 Nov 2020 01:37:25 GMT

The missing symbols are to be found in the C++ runtime libraries (msvcprt.lib, libcpmt.lib, etc.).

Re: Building custom MKL dll, unresolved external symbols

Weeks__John — Fri, 06 Nov 2020 18:30:52 GMT

@mecej4 Thanks! I added msvcprt.lib to the Additional Dependencies list and my dll just built successfully. Now to make sure that our application actually runs with the new dll!

topic Re: Building custom MKL dll, unresolved external symbols in Intel® oneAPI Math Kernel Library

Building custom MKL dll, unresolved external symbols

Re: Building custom MKL dll, unresolved external symbols

Re: Building custom MKL dll, unresolved external symbols