MATLAB: How to use Embedded Matlab Coder to generate C-code

matlab codermexsimulink coder

I am doing embedded C-Code generation using Embedded Matlab coder. I tried the Simulink Real-Time Workshop demo:
Demos>Simulink > Real-Time Workshop > Application Samples > Embeddable C-Code Generation Using Embedded MATLAB Coder
However after running:
emlc -T rtw:exe -o rtwdemo_emlcsobel rtwdemo_emlcmain.m stdio.h
I got the error:
??? Build error: Build failed for project "main_rtw". See the target build log for further details. Error in ==> main Line: 1 Column: 1 Compilation failed: Open error report.
I am using 32-bit Matlab R2008a on a Mac.
******* BUILD LOG ********
    1   gcc -c -O0   -DUSE_RTMODEL -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -fno-common -no-cpp-precomp -fexceptions  -DMODEL=rtwdemo_emlcsobel -DRT -DNUMST=1 -DTID01EQ=0 -DNCSTATES=0 -DUNIX -DMT=0 -DHAVESTDIO  -I. -I/tmp/tp9376e37b_e846_409f_ba91_83b4281a6361/emlcdir -I/Applications/MATLAB_R2008a/simulink/include -I/Applications/MATLAB_R2008a/extern/include -I/tmp/tp9376e37b_e846_409f_ba91_83b4281a6361/emlcdir/emcprj/rtwexe/rtwdemo_emlcmain -I/tmp/tp9376e37b_e846_409f_ba91_83b4281a6361/emlcdir        main.c
    2   In file included from main.c:11:
    3   main.h:13:18: error: math.h: No such file or directory
    4   main.h:14:20: error: stdlib.h: No such file or directory
    5   main.h:15:20: error: string.h: No such file or directory
    6   In file included from /usr/llvm-gcc-4.2/bin/../lib/gcc/i686-apple-darwin11/4.2.1/include/limits.h:15,
    7                    from rtwtypes.h:21,
    8                    from main.h:18,
    9                    from main.c:11:
   10   /Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin11/4.2.1/include/limits.h:15:25: error: no include path in which to search for limits.h
   11   main.c:13:19: error: stdio.h: No such file or directory
   12   main.c: In function 'main':
   13   main.c:40: error: 'FILE' undeclared (first use in this function)
   14   main.c:40: error: (Each undeclared identifier is reported only once
   15   main.c:40: error: for each function it appears in.)
   16   main.c:40: error: 'eml_fid' undeclared (first use in this function)
   17   main.c:65: warning: incompatible implicit declaration of built-in function 'fwrite'
   18   main.c: In function 'm_refp1_sqrt':
   19   main.c:177: warning: incompatible implicit declaration of built-in function 'sqrt'
   20   gmake: *** [main.o] Error 1
   21
Could this be because I have XCode 4.0 installed? I check mex.getCompilerConfigurations() and it says it is using GNU g95. I am currently downloading XCode 3.0 to see if that helps.
———-
I tried running the same demo on a windows machine (64 bit R2010a) – I got a different error (do not have the error message) – it was something along the lines 'Could not locate MEX compiler options file mexopts.bat'. When I run mex -setup, it shows 0 compilers when I try to automatically locate a compiler. I have Visual Studio 2010 Express installed on this computer. I am currently downloading Visual Studio 2008 Express, because it looks like R2010a Simulink does not support 2010 Express (<http://www.mathworks.com/support/compilers/R2010a/win64.html)>.
Any help getting either of these issues sorted out would be appreciated.
Om

Best Answer

If you have a look at the supported compilers for R2008a:
http://www.mathworks.com/support/compilers/release2008a/macintosh.html
you will notice that XCode is necessary for using Embedded MATLAB. If you run:
 mex -setup
in that MATLAB can you choose XCode as your compiler, does the code compile?
Related Question