C6000-CGT: There is a build error when compiling SYS/BIOS 6.83.0 with new CGT 8.5.0.LTS

Hi Valentin,

I could able to reproduce the issue with CGT 8.5.0.LTS using the test code below. 

#include <stdio.h>
//#include <time.h>                  // C66xx CGT run time header
#include <ti/posix/ccs/time.h>       // POSIX header from BIOS

int main(void)
{
#ifdef _STRUCT_TIMESPEC
    printf("C66x CGT runtime defines timespec\n");
#endif

#ifdef ti_posix_ccs_time__include
    printf("POSIX from BIOS defines timespec\n");
#endif

    struct timespec ts;
    ts.tv_sec = 1;
    ts.tv_nsec = 1000;
    printf("timespec.tv_sec = %ld, tv_nsec = %ld\n", (long)ts.tv_sec, ts.tv_nsec);
    return 0;
}

I was able to idenify the root cause (see, the attached screenshot)

In CGT v8.5, the runtime library’s <time.h> header introduces an additional include chain:

• <time.h> now includes <sys/timespec.h>,
• which in turn includes <sys/_timespec.h>.

Through this chain, both struct itimerspec and struct timespec are defined by the compiler’s standard headers. This creates a conflict with the TI-RTOS POSIX layer (ti/posix/ccs/time.h), which also declares the same structures, leading to the redefinition errors.

In earlier CGT versions (e.g., v8.3), <time.h> did not include <sys/timespec.h>, so timespec and itimerspec were not pulled in from the runtime library. As a result, only the TI-RTOS POSIX header provided those definitions, and no conflict occurred.

To avoid this (If you want to use CGT v8.5) ,

When working with BIOS/TI-RTOS, include "#include <ti/posix/ccs/time.h>" to ensure you are using the POSIX layer.

If you only require the compiler’s standard runtime support, include "#include <time.h>" to rely on the CGT runtime library.

Regards,

Betsy Varughese

Hi Valentin,

Yes, Exactly. According to the release notes, BIOS 6.83.00.18 was validated with C66x CGT 8.3.2 LTS, so it is recommended to use that specific compiler version for best compatibility.

Best Regards,

Betsy Varughese