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compiling MEX unresolved external symbol

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Ginaz Almus
Ginaz Almus on 29 Oct 2020
Answered: Aman Vyas on 4 Nov 2020
When i try to compile some file with mex function in matlab, i get this error:
compile_command =
mex -DCOMPILE_VISUALIZATION -I"C:\local\boost_1_59_0" -I"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\include" -L"./lib/" -L"C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\lib\x64" -L"C:\local\boost_1_59_0\lib64-msvc-14.0" -L"./lib/" -llibParallelFDTD -lVoxelizer -lcudart -lcuda -lfreeglut -lglew32 -llibboost_thread-vc140-mt-1_59 -llibboost_system-vc140-mt-1_59 -llibboost_chrono-vc140-mt-1_59 -llibboost_date_time-vc140-mt-1_59 -llibmx -llibut
Building with 'Microsoft Visual C++ 2015 Professional'.
Error using mex
Creating library mex_FDTD.lib and object mex_FDTD.exp
mex_FDTD.obj : error LNK2019: unresolved external symbol "public: void __cdecl FDTD::App::runVisualization(void)"
(?runVisualization@App@FDTD@@QEAAXXZ) referenced in function mexFunction
mex_FDTD.mexw64 : fatal error LNK1120: 1 unresolved externals
Error in compileWIN (line 39)
eval([compile_command ' mex_FDTD.cpp']);
I found that problem is related to runVisualization function but i could not find the reason. When this function is commented in mex_FDTD.cpp file,
eval([compile_command ' mex_FDTD.cpp'])
is working but some errors occurs than when running main project file in matlab.
I've been stuck with this problem, I'll be thankful for any suggestions and comments.

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Answers (1)

Aman Vyas
Aman Vyas on 4 Nov 2020
Hi,
You can have a look at similar question and follow the steps as shared:
You mention a library file FDTD.lib but I don't see you use it. Try including it in the mex command so it gets linked in (have all files in the current directory):
mex FDTT.lib and other files too.
Hope it helps !

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