mex link with blas

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

[John]

Same errors when using

mex fmpc_sim.c libmwblas.lib libmwblascompat32.lib

Answer 1

[Geoff Hayes]

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!