MATLAB: Do I receive an error when building an MSVC project from Real-Time Workshop in Visual Studio 2005

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I am building the attached model using the grt MSVC target. I am using the Team Edition of Visual Studio 2005. Opening the .mak file and building the project results in the following error:

 1>d:\Applications\MATLAB\R2006b\toolbox\rtw\dspblks\c\dsprandsrc\randsrc_gz_r_rt.c(82) : error C2143: syntax error : missing ';' before '/'
 1>d:\Applications\MATLAB\R2006b\toolbox\rtw\dspblks\c\dsprandsrc\randsrc_gz_r_rt.c(86) : error C2143: syntax error : missing ')' before ';'
 1>d:\Applications\MATLAB\R2006b\toolbox\rtw\dspblks\c\dsprandsrc\randsrc_gz_r_rt.c(86) : error C2143: syntax error : missing ';' before '<='
 1>d:\Applications\MATLAB\R2006b\toolbox\rtw\dspblks\c\dsprandsrc\randsrc_gz_r_rt.c(86) : error C2059: syntax error : ')'

Also, when using Visual Studio Express 2005 the error occurs. When using the professional version of MS Visual Studio 2005, this error does not occur.

Best Answer

The behavior seems to be a bug in some versions of Microsoft Visual Studio 2005.

In particular versions of Visual Studio 2005 (e.g., Visual Studio Express, Team Edition) the math.h file appears to contain an extra semi colon on line 303 of math.h.

 #define fmodf(x,y)  ((float)fmod((double)(x), (double)(y)))
 #define logf(x)     ((float)log((double)(x)));  
 #define log10f(x)   ((float)log10((double)(x)))

If you delete the extraneous semi-colon, the model should build without error.

Note the MathWorks tests and supports only the Professional version of Visual Studio 2005. In the Professional version, the model code compiles without error. The math.h file in the professional version is correct.

This particular model is including some additional code for the signal processing blocks. This error would not occur if there were no signal processing blocks in the model.

Related Solutions

MATLAB: How to debug a MATLAB C/C++ MEX-file in Microsoft Visual Studio 2005

This Solution is specific to the Microsoft Visual Studio 2005 debugger on Windows, and works on MATLAB 7.3 (R2006b) or later. Note that this process will not work if you only have Visual C++ installed (and not Visual Studio).

1. To debug a C/C++ MEX-file from the Microsoft Visual Studio 2005, you must first choose the Microsoft Visual C/C++ version 8.0 compiler in MATLAB, using the command:

mex -setup

2. Compile the MEX-file with the -g option, which builds the MEX-file with debugging symbols included. For example:

mex -g yprime.c

On a 32-bit platform, this command creates the executable file yprime.mexw32.

3. Start the Microsoft Visual Studio 2005 Development Environment. Do not exit your MATLAB session.

4. In Microsoft Development Environment, select Tools->Attach to Process... from the menu bar.

5. In the Processes dialog box, select the MATLAB process and click Attach.

6. Open the source files by selecting File -> Open -> File. Set a breakpoint on the desired line of code by right-clicking the line of code and selecting Breakpoint ->Insert Breakpoint from the Context Menu. If you have not yet run the executable file, ignore any "!" that appears with the breakpoint next to the line of code.

7. In MATLAB, start the executable file, which runs in the Microsoft debugging environment:

yprime(1,1:4)

For more information on how to debug in the Microsoft environment, refer to the Microsoft Development Environment documentation.

A more specific writeup of the above procedure, along with instructions on how to debug with gdb on Linux, is available in the MATLAB documentation here:

https://www.mathworks.com/help/matlab/matlab_external/debugging-on-microsoft-windows-platforms.html

MATLAB: Do I get a compilation error when I compile the Real-Time Workshop 6.6 (R2007a) generated code containing ‘_isnan’ with the hand-written code

The different implementation of 'rtIsNan' function is due to using Microsoft Visual C++ compiler during code generation. If Microsoft Visual Compiler is used for code generation, then RTW generated code contains reference to _isnan() function which is shipped with the compiler.

This can be verified in the MSDN documentation page below:

 <http://msdn.microsoft.com/en-us/library/aa298428%28VS.60%29.aspx>

For example, following is the generated code with Real-Time Workshop R2007a, R2007b, R2008a and R2008b, when Microsoft Visual C++ 2005 was NOT selected as the compiler:

boolean_T rtIsNaN(real_T value)
{
     return((value!=value) ? 1U : 0U);
}

Following is the generated code in R2007a,R2007b and R2008a, when Microsoft Visual C++ 2005 was the selected compiler:

boolean_T rtIsNaN(real_T value)
{
      /* For MSVC 6.0, must use the compiler specific comparison function */
      return _isnan(value)? 1U:0U;
}

As you can observe above, when MS Visual Compiler is used, there is a reference to _isnan. Therefore when you package this into an archive for compilation using a different compiler, this would result in an error.

However in R2008b, even with MS VC as the selected compiler, the code generated contains appropriate pre-processor directives to handle this situation. Following is the code generated in R2008b when MS VC is selected as compiler::

boolean_T rtIsNaN(real_T value)
{
#if defined(_MSC_VER) && (_MSC_VER <= 1200)
      /* For MSVC 6.0, use a compiler specific comparison function */
      return _isnan(value)? 1U:0U;
    #else
      return((value!=value) ? 1U : 0U);
    #endif
}

_MSC_VER is MS VC specific directive explained in the link below:

 <http://msdn.microsoft.com/en-us/library/b0084kay.aspx>

To summarize, there are two workarounds to this issue:

1. Execute "mex -setup" in your MATLAB and change the current compiler to a non-Microsoft compiler.

2. Please generate code using R2008b or later versions.

Best Answer

Related Solutions

MATLAB: How to debug a MATLAB C/C++ MEX-file in Microsoft Visual Studio 2005

MATLAB: Do I get a compilation error when I compile the Real-Time Workshop 6.6 (R2007a) generated code containing ‘_isnan’ with the hand-written code

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