TMS320F280039C: The C2000 compiler does not generate any warnings when ‘=‘ is used instead of ‘==‘ in ‘if’ condition.

Devin Pope

Tool/software:

I find the C2000 compiler in CCS11.1 does not generate any warnings when ‘=‘ is used instead of ‘==‘ in ‘if’ condition. I want to check these syntax errors in my programs. So how do I configure the compiler in this situation?

over 1 year ago

0 Aishwarya Rajesh over 1 year ago

TI__Mastermind 21225 points

Hi Devin,

Can you confirm what compiler version you are using? I'm connecting you with a compiler expert to help further.

Best Regards,

Aishwarya

0 George Mock over 1 year ago in reply to Aishwarya Rajesh

TI__Guru**** 253590 points

The latest version of the C2000 compiler is 22.6.2.LTS. When I try it, I get a warning.

% cl2000 --verbose_diagnostics file.c
"file.c", line 3: warning: use of "=" where "==" may have been intended
      if (arg = 0)
          ^

The diagnostic is emitted whether or not the option --verbose_diagnostics is used. This option causes that diagnostic to also show the affected source line, with an indicator to where the error begins.

Thanks and regards,

-George

0 Devin Pope over 1 year ago in reply to Aishwarya Rajesh

Prodigy 10 points

Hi Aishwarya,

Sorry for replying so late. My email marked this email as spam. So I didn't see this reply. The compiler version is v21.6.0.LTS.

Best regards.

0 Devin Pope over 1 year ago in reply to George Mock

Prodigy 10 points

Hi George,

Sorry for replying so late. My email marked this email as spam. So I didn't see this reply. The compiler version is v21.6.0.LTS.

I find if ‘arg’ in your code is a global variable, the diagnostic will indeed appear. However, there is no diagnostic when ‘arg’ is a local variable. I’m confused about it.

Best regards.

0 George Mock over 1 year ago in reply to Devin Pope

TI__Guru**** 253590 points

Devin Pope said:
there is no diagnostic when ‘arg’ is a local variable

I am unable to reproduce that result. For the source file where this occurs, please follow the directions in the article How to Submit a Compiler Test Case.

Thanks and regards,

-George

0 Devin Pope over 1 year ago in reply to George Mock

Prodigy 10 points

I have created a project with only 'main.c' source file. The code in the 'main.c' is shown below.

int global, global1;
void main(void)
{
    int i;
    if(global = global1){
        i++;
    }
    if(i = global1){
        i++;
    }
}

My previous description was incorrect. I originally thought it was a problem on the left side of '='. In fact, there is no diagnostic if the right side of '=' is a global variable. The compiler version is v21.6.0.LTS.

Best regards.

0 George Mock over 1 year ago in reply to Devin Pope

TI__Guru**** 253590 points

Thank you for the test case. I am able to reproduce the same behavior. I filed EXT_EP-12882 to have this investigated. You are welcome to follow it with that link. Note the issue is not considered a bug, but a request to improve the diagnostics issued by the compiler.

Thanks and regards,

-George

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TMS320F280039C: The C2000 compiler does not generate any warnings when ‘=‘ is used instead of ‘==‘ in ‘if’ condition.