compiling CPP file in Matlab

Dear All,

I am trying to compile CPP file in Matlab the following error comes when we run CPP file

>> mex crossover.cpp
Command line warning D4002 : ignoring unknown option '-Oy-' 
Microsoft (R) Incremental Linker Version 6.00.8168 
Copyright (C) Microsoft Corp 1992-1998. All rights reserved. 

C:\Users\Nasar\AppData\Local\Temp\mex_3EF2C05A-E50F-47E4-CD92-86944314E3FC\crossover.obj  
LINK : error LNK2001: unresolved external symbol mexFunction 
C:\Users\Nasar\AppData\Local\Temp\mex_3EF2C05A-E50F-47E4-CD92-86944314E3FC\templib.x : fatal error LNK1120: 1 unresolved externals 
LINK : fatal error LNK1141: failure during build of exports file 

    C:\PROGRA~1\MATLAB\R2007A\BIN\MEX.PL: Error: Link of 'crossover.mexw32' failed. 

??? Error using ==> mex at 206
Unable to complete successfully.

we set the compiler through mex -setup command

please resolve the problem.

Thanks

Answer 1

[Walter Roberson]

Does your crossover.cpp file have

extern "C" {
  DATATYPE mexFunction (ARGUMENTS) {
    ......
  }
}

except with a datatype where DATATYPE is indicated, "mexFunction" and actual arguments where ARGUMENTS is indicated?

If your mexFunction is not within an extern "C" then it will not be accessible to MATLAB.