MATLAB Answers

mex link with blas

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John
John on 13 Feb 2015
Answered: Geoff Hayes on 14 Feb 2015
I get the following errors when using mex
>> mex -v fmpc_sim.c
Verbose mode is on.
Neither -compatibleArrayDims nor -largeArrayDims is selected.
Using -compatibleArrayDims. In the future, MATLAB will require the use of
-largeArrayDims and remove the -compatibleArrayDims option.
For more information:
http://www.mathworks.com/help/matlab/matlab_external/upgrading-mex-files-to-use-64-bit-api.html.
... Looking for compiler 'Microsoft Windows SDK 7.1 (C)' ...
... Looking for registry setting 'HKLM\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v7.1' InstallationFolder ...Yes ('C:\Program Files\Microsoft SDKs\Windows\v7.1\').
... Looking for registry setting 'HKLM\SOFTWARE\Wow6432Node\Microsoft\VisualStudio\SxS\VC7' 10.0 ...Yes ('c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\').
... Looking for file 'c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\bin\amd64\cl.exe' ...Yes.
... Looking for folder 'c:\Program Files (x86)\Microsoft Visual Studio 10.0' ...Yes.
Found installed compiler 'Microsoft Windows SDK 7.1 (C)'.
Options file details
-------------------------------------------------------------------
Compiler location: c:\Program Files (x86)\Microsoft Visual Studio 10.0
Options file: C:\Users\VorwaldJG\AppData\Roaming\MathWorks\MATLAB\R2014a\mex_C_win64.xml
CMDLINE100 : cl /c /GR /W3 /EHs /nologo /MD -I"C:\Program Files\MATLAB\R2014a\extern\include" -I"C:\Program Files\MATLAB\R2014a\simulink\include" /DMX_COMPAT_32 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /O2 /Oy- /DNDEBUG C:\Users\VorwaldJG\Documents\working\onr_model_predictive_control\software\fast_mpc-0.0.1\fmpc_sim.c /FoC:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj
CMDLINE200 : link /nologo /manifest /DLL /EXPORT:mexFunction C:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj /LIBPATH:"C:\Program Files\MATLAB\R2014a\extern\lib\win64\microsoft" libmx.lib libmex.lib libmat.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /out:fmpc_sim.mexw64
CMDLINE250 : mt -outputresource:fmpc_sim.mexw64;2 -manifest fmpc_sim.mexw64.manifest
CMDLINE300 : del C:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj fmpc_sim.exp fmpc_sim.lib fmpc_sim.mexw64.manifest fmpc_sim.ilk
COMPILER : cl
COMPFLAGS : /GR /W3 /EHs /nologo /MD -I"C:\Program Files\MATLAB\R2014a\extern\include" -I"C:\Program Files\MATLAB\R2014a\simulink\include" /DMX_COMPAT_32 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE
COMPDEFINES : /DMX_COMPAT_32 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE
MATLABMEX : /DMATLAB_MEX_FILE
OPTIMFLAGS : /O2 /Oy- /DNDEBUG
INCLUDE : -I"C:\Program Files\MATLAB\R2014a\extern\include" -I"C:\Program Files\MATLAB\R2014a\simulink\include"
DEBUGFLAGS : /Z7
LINKER : link
LINKFLAGS : /nologo /manifest
LINKTYPE : /DLL
LINKEXPORT : /EXPORT:mexFunction
LINKLIBS : /LIBPATH:"C:\Program Files\MATLAB\R2014a\extern\lib\win64\microsoft" libmx.lib libmex.lib libmat.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib
LINKDEBUGFLAGS : /debug /PDB:"fmpc_sim.mexw64.pdb"
LINKOPTIMFLAGS :
OBJEXT : .obj
LDEXT : .mexw64
SETENV : set COMPILER=cl
set COMPFLAGS=/c /GR /W3 /EHs /nologo /MD -I"C:\Program Files\MATLAB\R2014a\extern\include" -I"C:\Program Files\MATLAB\R2014a\simulink\include" /DMX_COMPAT_32 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /DMX_COMPAT_32 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /DMATLAB_MEX_FILE
set OPTIMFLAGS=/O2 /Oy- /DNDEBUG
set DEBUGFLAGS=/Z7
set LINKER=link
set LINKFLAGS=/nologo /manifest /export:%ENTRYPOINT% /DLL /LIBPATH:"C:\Program Files\MATLAB\R2014a\extern\lib\win64\microsoft" libmx.lib libmex.lib libmat.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /EXPORT:mexFunction
set LINKDEBUGFLAGS=/debug /PDB:"%OUTDIR%%MEX_NAME%.mexw64.pdb"
set NAME_OUTPUT=/out:"%OUTDIR%%MEX_NAME%%MEX_EXT%"
SDKROOT : C:\Program Files\Microsoft SDKs\Windows\v7.1\
VSROOT : c:\Program Files (x86)\Microsoft Visual Studio 10.0
MATLABROOT : C:\Program Files\MATLAB\R2014a
ARCH : win64
SRC : C:\Users\VorwaldJG\Documents\working\onr_model_predictive_control\software\fast_mpc-0.0.1\fmpc_sim.c
OBJ : C:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj
OBJS : C:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj
SRCROOT : C:\Users\VorwaldJG\Documents\working\onr_model_predictive_control\software\fast_mpc-0.0.1\fmpc_sim
DEF : C:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.def
EXP : fmpc_sim.exp
LIB : fmpc_sim.lib
EXE : fmpc_sim.mexw64
ILK : fmpc_sim.ilk
MANIFEST : fmpc_sim.mexw64.manifest
TEMPNAME : fmpc_sim
EXEDIR :
EXENAME : fmpc_sim
OPTIM : /O2 /Oy- /DNDEBUG
LINKOPTIM :
-------------------------------------------------------------------
Building with 'Microsoft Windows SDK 7.1 (C)'.
Set PATH = c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Tools;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Bin\amd64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Bin\VCPackages;C:\Program Files\Microsoft SDKs\Windows\v7.1\\Bin\x64;C:\Program Files\Microsoft SDKs\Windows\v7.1\\Bin;;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Tumbleweed\Desktop Validator\;C:\Program Files\ActivIdentity\ActivClient\;C:\Program Files (x86)\ActivIdentity\ActivClient\;C:\Program Files (x86)\MATLAB\R2014a\runtime\win32;C:\Program Files (x86)\MATLAB\R2014a\bin;C:\Program Files\MATLAB\R2014a\runtime\win64;C:\Program Files\MATLAB\R2014a\bin;C:\Program Files\Microsoft Windows Performance Toolkit\;C:\Program Files (x86)\Java\jre7\bin;C:\Program Files\TortoiseSVN\bin;C:\Strawberry\c\bin;C:\Strawberry\perl\site\bin;C:\Strawberry\perl\bin;C:\Program Files\R\R-3.1.1\bin\x64
Set INCLUDE = c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE;C:\Program Files\Microsoft SDKs\Windows\v7.1\\INCLUDE;C:\Program Files\Microsoft SDKs\Windows\v7.1\\INCLUDE\gl;C:\Program Files\MATLAB\R2014a\extern\include;;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE;C:\Program Files\Microsoft SDKs\Windows\v7.1\\INCLUDE;C:\Program Files\Microsoft SDKs\Windows\v7.1\\INCLUDE\gl;C:\Program Files\MATLAB\R2014a\extern\include;;
Set LIB = c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Lib\amd64;C:\Program Files\Microsoft SDKs\Windows\v7.1\\Lib\X64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\ATLMFC\LIB\AMD64;C:\Program Files\MATLAB\R2014a\lib\win64;C:\Program Files\MATLAB\R2014a\extern\lib\win64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Lib\amd64;C:\Program Files\Microsoft SDKs\Windows\v7.1\\Lib\X64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\ATLMFC\LIB\AMD64;C:\Program Files\MATLAB\R2014a\lib\win64;C:\Program Files\MATLAB\R2014a\extern\lib\win64;
Set LIBPATH = c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Lib\amd64;C:\Program Files\Microsoft SDKs\Windows\v7.1\\LIB\X64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\ATLMFC\LIB\AMD64;C:\Program Files\MATLAB\R2014a\extern\lib\win64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Lib\amd64;C:\Program Files\Microsoft SDKs\Windows\v7.1\\LIB\X64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\ATLMFC\LIB\AMD64;C:\Program Files\MATLAB\R2014a\extern\lib\win64;
cl /c /GR /W3 /EHs /nologo /MD -I"C:\Program Files\MATLAB\R2014a\extern\include" -I"C:\Program Files\MATLAB\R2014a\simulink\include" /DMX_COMPAT_32 /D_CRT_SECURE_NO_DEPRECATE /D_SCL_SECURE_NO_DEPRECATE /D_SECURE_SCL=0 /DMATLAB_MEX_FILE /O2 /Oy- /DNDEBUG C:\Users\VorwaldJG\Documents\working\onr_model_predictive_control\software\fast_mpc-0.0.1\fmpc_sim.c /FoC:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj
fmpc_sim.c
link /nologo /manifest /DLL /EXPORT:mexFunction C:\Users\VORWAL~1\AppData\Local\Temp\1\mex_32143412800360_6452\fmpc_sim.obj /LIBPATH:"C:\Program Files\MATLAB\R2014a\extern\lib\win64\microsoft" libmx.lib libmex.lib libmat.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /out:fmpc_sim.mexw64
Error using mex
Creating library fmpc_sim.lib and object fmpc_sim.exp
fmpc_sim.obj : error LNK2019: unresolved external symbol dgemv_ referenced in function dnudz
fmpc_sim.obj : error LNK2019: unresolved external symbol dtrsv_ referenced in function dnudz
fmpc_sim.obj : error LNK2019: unresolved external symbol dgemm_ referenced in function dnudz
fmpc_sim.obj : error LNK2019: unresolved external symbol dtrtrs_ referenced in function dnudz
fmpc_sim.obj : error LNK2019: unresolved external symbol dposv_ referenced in function dnudz
fmpc_sim.obj : error LNK2019: unresolved external symbol daxpy_ referenced in function rdrp
fmpc_sim.obj : error LNK2019: unresolved external symbol dnrm2_ referenced in function resdresp
fmpc_sim.mexw64 : fatal error LNK1120: 7 unresolved externals
  1 Comment
John
John on 13 Feb 2015
Same errors when using
mex fmpc_sim.c libmwblas.lib libmwblascompat32.lib

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Answers (1)

Geoff Hayes
Geoff Hayes on 14 Feb 2015
John - I think that you have to explicitly link to the libraries rather than just passing in the lib names, i.e. use the -l option. If I take the matrixMultiply.c example from calling lapack and blas, and try to build/compile it as just
mex matrixMultiply.c
I observe the error
error LNK2019: unresolved external symbol _dgemm referenced in function _mexFunction
However, if I compile and link to the library as
mex matrixMultiply.c -lmwblaslib
then the result is
Building with 'Microsoft Windows SDK 7.1 ©'.
MEX completed successfully
Try doing it as above and see what happens!

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