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Compiler/TMS570LC4357: Compiler option to disable VLA allocation

Richa Sahasrabudhe1
Prodigy 100 points
Part Number: TMS570LC4357

Tool/software: TI C/C++ Compiler

Hi

I need to disable VLA allocation because our HEAP size is not enough to allocate the VLA block.

#define NORMAL_BLOCK_SIZE       32700
Is there a compiler option for the TI CGT ARM compiler to disable support for VLA allocations?
Regards
Richa
  • 0
    TI__Guru**** 249900 points

    There is no method that disables only VLA.

    The VLA feature is part of the C11 standard.  The TI compiler supports the C89 standard by default, and other standards as extensions.  Thus, you could consider using the option --strict_ansi, which disables all language extensions. If VLA is the only language extension your code uses, that could work.  If your code uses other language extensions, then this may not work.

    If you do go with --strict_ansi, please understand that adding --c11 causes the compiler to support the C11 standard, which includes VLA.  Thus, under the combination of options --strict_ansi --c11, VLA is supported.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Prodigy 100 points

    Is there an option to reconfigure the VLA block size to be smaller?

  • 0 in reply to Richa Sahasrabudhe1
    TI__Guru**** 249900 points

    Unfortunately, there is no command line option.  

    As you've discovered, this preprocessor symbol ...

    #define NORMAL_BLOCK_SIZE       32700

    ... is defined in the RTS source file vla_alloc.c.  You could consider changing it, and rebuilding the RTS library.  However, you would have to remember to do that every time you upgrade the compiler.  I presume this is not practical.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Prodigy 100 points

    Yes - I would rather not have a patch to the compiler. I guess I would just need to remove the VLA usages from the code manually.

    Is it possible to push this request (configurable VLA block size) for the next compiler version?

  • 0 in reply to Richa Sahasrabudhe1
    TI__Guru**** 249900 points

    Richa Sahasrabudhe1 said:
    Is it possible to push this request (configurable VLA block size) for the next compiler version?

    I filed the entry EXT_EP-9729 to request this change in the compiler.  You are welcome to follow it using the link below in my signature.

    Thanks and regards,

    -George