compiling MEX unresolved external symbol

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.

Answer 1

[Aman Vyas]

Hi,

You can have a look at similar question and follow the steps as shared:

https://www.mathworks.com/support/search.html/answers/107106-error-lnk2019-unresolved-external-symbol-when-compiling-mex.html?fq=asset_type_name:answer%20category:matlab/call-mex-files-1&page=1

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 !