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What C programming version supports zynq7000(Xilinx SDK)

Former Member

I would like to know what C version is the natural for zynq programming(Xilinx SDK).

I'm only sure it's not C99 because when I try
for (int i = 0; i<10 ; i++)
I get the error:
error: 'for' loop initial declarations are only allowed in C99 mode

I've been looking around but I haven't found nothing usefull, I'm interested in the C "manual" supported by zynq 7000 devices (Xilinx SDK)because is very annoying to see this error.

Also I prefer not to use the -std=c99 options because I don't know if it is 100% compatible.

Thanks,
Guillermo

  • 0

    Hi Guillermo,

    Xilinx SDK uses the gcc compiler in a default installation and for Zynq targets uses the Sourcery CodeBench Lite compiler.  I checked in my 2014.2 installation and the gcc version is reported as 4.8.1 so you would get the support of that version of compiler and you can access the GNU documentation online:

    https://gcc.gnu.org/onlinedocs/4.8.1/

    It appears as though gcc supports C89/C90 standards by default if you do not specify which language standard to be used during compile time:

    https://gcc.gnu.org/onlinedocs/gcc-4.8.1/gcc/Standards.html#Standards

    So your code:

    for (int i = 0; i < 10; i++) { ...

    is not valid in the C89/C90 standard.

    But if you were to move your integer declaration outside the loop, that would be valid.

    int i;
    for (i = 0; i < 10; i++) { ...

    Your original code is allowed in C99 and later standards of the C language.  According to the gcc documentation, if you want to use the C99 version of the C standard, then you should use the -std=c99 or -std=iso9899:1999 options.

    Regards,

    -Kevin

  • 0 in reply to zedhed

    hi Kevin,

    thanks for the replay, I supposed that after doing more research.

    But now, my question is:
    Is c99 100% supported using zynq 7000? (I have a zedboard)
    I will try doing c99, but if I found strange behavior it would be good to knw if it is my fault or compilers.

    Thanks,
    Guillermo

  • 0

    Hi Guillermo,

    Well the compiler that comes with SDK comes from the GCC code base.  If you are experiencing issues with the compiler, you can refer back to the GCC documentation or source code.

    I am not sure what you mean by the question "Is c99 100% supported using zynq 7000?" since it is the compiler itself that supports the C99 standard and in turn generates machine code which targets the ARM processor on Zynq.

    Regards,

    -Kevin