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TMS320F28388S: Can CLA Files be Built in a C++ Project?

Ed Sanders
Genius 3830 points
Part Number: TMS320F28388S

Tool/software:

Greetings,

Our projects are written in C++, and we use the “Treat C files as C++ files (--cpp_default, -fg)” Language mode.  Now we are trying to add a cla file to the project.  This causes the complier to try to build the CLA file as a cpp file and fails with:

C++ source files are not allowed for CLA

If the "Treat C files as C++ files (-cpp_default, -fg)" box is unchecked, it still fails with:

#35 #error directive: "Header file <stdlib.h> not supported by CLA compiler"        .ccsproject          /<project_name> line 47, external location: C:\ti\ccs1250\ccs\tools\compiler\ti-cgt-c2000_22.6.1.LTS\include\stdlib.h C/C++ Problem

But the CLA file does not use stdlib.h, and I can’t find any option which would auto-include it.

Is there an option which would force the cla files to be treated as C files?

Thank you,

Ed

  • 0
    TI__Genius 13655 points

    Hi Ed,

    Files with a .cla extension are compiled as C files with a special invocation of the compiler for CLA. 

    It looks like the issue you're running into is that the --cla_support flag is being evaluated by the compiler before the --cpp_default, so the .cla file is already being considered a C file when --cpp_default is evaluated.

    You can try following the steps in the 2.4.1 Setting Default Compiler Options (C2000_C_OPTION) section of the C28x compiler guide (linked here) to define your own compiler flags and move the --cla_support flag after --cpp_default flag. 

    Best Regards,

    Delaney

  • 0 in reply to Delaney Woodward
    Genius 3830 points

    Hi Delaney,

    This could swap the processing of the two flags.  But would all the other flags need to be in C2000_C_OPTION too?  In other words, when C2000_C_OPTION is used, does the compiler start with a set of defaults, or does it take the values already in the project Properties and modify those?

    Thank you,

    Ed

  • 0 in reply to Ed Sanders
    TI__Genius 13655 points

    Hi Ed,

    That is a good question, let me loop in one of the compiler experts to comment.

    Best Regards,

    Delaney

  • +1 in reply to Delaney Woodward
    TI__Guru**** 244200 points
    Ed Sanders said:
    Is there an option which would force the cla files to be treated as C files?

    No.  But there is a way to resolve the problem.

    Use the File Specific Options feature of CCS on the CLA file.  Use it to remove the option --cpp_default for the CLA file.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Genius 3830 points

    Hi George,

    For the cla file, I unchecked the Language Option “Treat C files as C++ files (--cpp_defult, -fg)” and that replaced the “C++ source files are not allowed for CLA” error with “#35 #error directive “Header file <stdlib.h> not supported by CLA compiler”.  I have looked through the compiler options, but can’t find anything which tells it to not use stdlib.h,  Did I miss something?

    Thank you,

    Ed

  • 0 in reply to Ed Sanders
    TI__Guru**** 244200 points

    It must be the case that the CLA file somehow includes stdlib.h.  Just as a build time experiment, add the option --gen_preprocessor_listing.  To learn what that option does, please search for it in the C28x compiler manual.  Among other things, it creates a file with same name as the source file, but the file extension is changed to .rl.  Use the .rl file to work out how stdlib.h is included.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Genius 3830 points

    I had the same thought.  So I deleted everything in the .cla file to make it 0 length.  The problem still persists.  In both cases, the first two lines of the rl file are:

    L 1 "<path to the .cla file>/<file_name.cla>"

    L 1 "C:/ti/ccs1250/ccs/tools/compiler/ti-cgt-c2000_22.6.1.LTS/include/stdlib.h" 1

    So I feel as though there must be another setting which I am not aware of which is automatically including stdlib.h.

    Thank you,

    Ed

  • +1 in reply to Ed Sanders
    Genius 3830 points

    Hi George,

    I found it!  In the Include Options, there was a preinclude file of stdlib.h.  I removed it for the cla file, and now it builds!  Thank you for showing me how to change the properties of a single file.  That gave me the tool I needed to make it work.

    Thanks again,

    Ed