MATLAB: Is it possible to use LCC to link FORTRAN and C code in an S-function in Simulink 7.4 (R2009b)

ccodecompilecompilerfortranlcclinkmicrosofts-functionsimulinkvisual

I am trying to create a Simulink Level 2 S-function using the LCC C compiler, and the Compaq Visual Fortran 6.6 compiler. For instance, I am trying to create the S-function from the example files "sfun_atmos.c" and "sfun_atmos_sub.f", located in the directory:

$MATLABROOT\simulink\src

(where $MATLABROOT refers to the root MATLAB directory)

The documentation states that this example can be compiled using the Microsoft Visual C/C++. Since the LCC compiler is shipped with MATLAB, I expect that I should be able to link my Fortran object files and libraries with my C code using LCC. However, I am experiencing problems doing so. Specifically, I receive an error that "sfun_atmos_sub" contains an undefined reference to "__FIIfexp_". I have confirmed that this routine is present in DFOR.LIB, which is located, for instance in C:\Microsoft Visual Studio\DF98\LIB.

Best Answer

The object file formats used by LCC and Microsoft are in general incompatible. They may unpredictably work together on occasion, but may not in other cases.

To work around this issue, try using the Microsoft Visual C/C++ compiler, such as Microsoft Visual C/C++ version 6.0.

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MATLAB: Do I get a “referenced memory” error during MEX compilation with MATLAB 7.9 (R2009b)

This can occur if your C source code contains typedef statements with more than 2 tokens/words after the typedef declaration. One example of this is:

typedef unsigned __int32 BOOL32;

This statement is supported by the Microsoft C compiler but not LCC.

To fix this problem, either remove these types of typedef statements, or install the Microsoft C compiler. If you do not want to pay for the Microsoft C compiler, Microsoft does offer an "Express Edition" compiler free of charge that is available for download at

https://go.microsoft.com/fwlink/?LinkId=104679

MATLAB: How to use Intel Fortran Composer XE 2011 12.0 and Microsoft Visual Studio 2010 to compile Fortran code into a MEX file for MATLAB 7.13 (R2011b)

To compile FORTRAN code into a MEX file with Intel Fortran Composer XE 2011 in Microsoft Visual Studio 2010, follow the ensuing steps.

This solution demonstrates compiling the example file 'timestwo.F'.

1. Set up a project in Visual Studio as follows:

a. Open Microsoft Visual Studio and navigate to 'File' -> 'New' -> 'Project'.

b. Select 'Intel Visual Fortran' -> 'Library' -> 'Dynamic-link Library'.

c. Following this, enter the name of the project and its location in the indicated text areas and click OK.

2. Add 'timestwo.F' to the project:

a. Copy the file 'timestwo.F' to the folder where you created the Visual Studio project. This file may be obtained from the following location:

$MATLABROOT\extern\examples\refbook

where $MATLABROOT is the MATLAB root directory, and may be determined by entering the command:

>> matlabroot

at the MATLAB command prompt.

b. In Visual Studio, right-click on the 'Source Files' folder in the 'Solution Explorer' and click 'Add' -> 'Existing Item...'.

c. Select 'timestwo.F' and click 'Add'.

3. Create the module definition file:

a. Right click on the project name, choose 'Add' -> 'New Item'.

b. Select 'Text File (.txt)'

c. Name the file 'module.def' (remove the .txt extension).

d. After creating it, the file should open in Visual Studio. Paste the following lines:

     LIBRARY MYFILE 
     EXPORTS MEXFUNCTION

where MYFILE is the name of the MEX file to create, e.g. timestwo.mexw32

e. Save the file.

4. Right click on the project name and select 'Properties' in the solution explorer to open the project

properties. Once this window has opened, make the following changes:

a. Under 'Fortran' -> 'General', add the directory

$MATLABROOT\extern\include

to the field 'Additional Include Directories'.

b. Under 'Fortran' -> 'Preprocessor', choose 'Yes(/fpp)' for 'Preprocess Source File'.

c. Also under 'Fortran' -> 'Preprocessor', add the following to 'Preprocessor Definitions':

MATLAB_MEX_FILE

d. Under 'Fortran' -> 'External Procedures', set the 'Calling Convention' field to:

'C, REFERENCE (/iface:cref)'

e. Also under 'Fortran' -> 'External Procedures', set the 'Name Case Interpretation' field to:

 'Upper Case (/names:uppercase)'.

f. Under 'Linker' -> 'General', change 'Output File' to '$(OutDir)\$(ProjectName).mexw32'.

g. Also under 'Linker' -> 'General', add the directory

$MATLABROOT\extern\lib\win32\microsoft

to the 'Additional Library Directories' field.

h. Under 'Linker' -> 'Input', add the following:

libmx.lib libmex.lib libmat.lib

to the 'Additional Dependencies' field.

i. Also under 'Linker' -> 'Input', add the file

module.def

to the 'Module Definition File' field.

j. Click 'Ok' to save and close the project properties.

e. Click 'Apply' -> 'Ok' to close the project properties.

5. Build the solution.

6. In MATLAB, change the current MATLAB directory to the directory in which the MEX file was

created.

7. Run the MEX file using the following command:

   <mexfilename>(inputs)

For instance, if you built 'timestwo' into a MEX file named 'timestwo.mexw32' run it as follows:

>> timestwo(2.3)

You should receive the following output:

4.600000

Best Answer

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MATLAB: Do I get a “referenced memory” error during MEX compilation with MATLAB 7.9 (R2009b)

MATLAB: How to use Intel Fortran Composer XE 2011 12.0 and Microsoft Visual Studio 2010 to compile Fortran code into a MEX file for MATLAB 7.13 (R2011b)

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