How to enable C99 support in Code Composer?

Derek

I'm porting some C code from IAR to CCS that uses a few C99 features, like inline variable declarations. These cause an error when compiling. Does CCS support C99? I read that in GCC you can tell it to use C99 with the compile flag "-std=c99". How do I do this in Code Composer?

Thanks,

Derek

over 13 years ago

0 Archaeologist over 13 years ago

TI__Guru* 84285 points

There is no such option in the TI compiler. The compiler is a C89 compiler. We do support a handful of C99 options as extensions, but there is no C99 mode.

0 Derek over 13 years ago in reply to Archaeologist

Mastermind 9792 points

Really? You've got to be kidding. That's embarrassing - C99 was approved over 12 years ago. Most of the competition supports C99 (IAR, CodeSourcery, etc.).

Is it on the roadmap? Estimated release date?

Thanks,

Derek

0 Archaeologist over 13 years ago in reply to Derek

TI__Guru* 84285 points

There is no specific roadmap for supporting C99, but the compiler already supports many C99 features as extensions to C89. Certainly we'd prefer to add complete C99 support, but other areas of compiler development are in greater demand.

0 Douglas Gwyn over 13 years ago in reply to Archaeologist

Expert 2210 points

Many of the additions made by C99 were in the library, so Dinkumware could easily provide you with an update. The only really difficult part is <tgmath.h>, which requires compiler support.

The language proper was enhanced by in-line variable declaration, //-comments, type complex, and restrict parameter qualification.

The preprocessor was enhanced by //-comments, variadic macros (different from how GCC originally had them), and empty macro arguments.

Of these, I think you could leave out <tgmath.h>, type complex, variadic macros, and empty macro arguments without many people complaining. You already support //-comments, although some of the MISRA checks don't grok them. "restrict" can be handled by simply ignoring it ( in effect, -Drestrict= ). So in-line variable declaration is about the only "interesting" change that is really needed. It is especially useful for:

for(int i=0; i<N; ++i) ...

0 Archaeologist over 13 years ago in reply to Douglas Gwyn

TI__Guru* 84285 points

The restrict type qualifier is fully supported.

Please see http://processors.wiki.ti.com/index.php/C99_Extensions_in_TI_Compilers for a list of C99 features the TI compiler already supports.

0 Douglas Gwyn over 13 years ago in reply to Douglas Gwyn

Expert 2210 points

The nearby discussion about alloca reminds me that another C99 feature that a lot of programmers would appreciate implemented is VLAs (variable-length arrays).

0 Miguel Aguilar over 12 years ago in reply to Douglas Gwyn

Intellectual 855 points

Hi,

Is VLA still not supported in code composer? Is there any workaround?

Thanks,

Miguel

0 George Mock over 12 years ago in reply to Miguel Aguilar

TI__Guru**** 249380 points

Miguel Aguilar said:
Is VLA still not supported in code composer?

VLA is not supported. It is on our roadmap. Expect to see changes this year.

Miguel Aguilar said:
Is there any workaround?

This forum thread discusses one way to go about it.

Thanks and regards,

-George

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How to enable C99 support in Code Composer?