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Looking for a way to not place any static data in BSS section

Adam Openshaw
Note: This was originally posted on 2nd October 2012 at http://forums.arm.com

The ARM compiler is very strict (and formidable) at placing zero initialized or uninitialized static data > 8 bytes into the BSS section to save space in the image.  I have a use case where I do not want ANY static data in BSS.  I want all of it to go into RO/RW-DATA sections only. 

I've scoured the web looking for something similar or equivalent to the GNU C compiler's -fno-zero-initialized-in-bss option for RVCT, but cannot find anything.  I'm compiling with DS-5. 

Does anyone know if there is a way to compile without placing any static data into the BSS section?  Placing static data into a BSS section is an optimization, and it's only natural that you should be able to disable it.

Thanks,
Meiyo
Parents
  • Note: This was originally posted on 3rd October 2012 at http://forums.arm.com

    I was able to accomplish what I desired after consulting ARM support.  For anyone who is interested, here is the solution:

    The answer is using the --bss_threshold option when compiling.  The documentation on this option makes it seem like the only two options are: --bss_threshold=0 or --bss_threshold=8...

    [font=Verdana, Tahoma, Arial, Helvetica, sans-serif][size=2]
    Syntax
    [/size][/font][font=Verdana, Tahoma, Arial, Helvetica, sans-serif][size=2]--bss_threshold=numWhere:

    numis either:

    0place small global ZI data items in ZI data sections

    8place small global ZI data items in RW data sections.

    [/size][/font]



    It turns out, however, that the compiler is actually capable of accepting anything up to the maximum int, and anything below that size in bytes will be put into RW data instead of BSS.

    Regards,
    Meiyo
Reply
  • Note: This was originally posted on 3rd October 2012 at http://forums.arm.com

    I was able to accomplish what I desired after consulting ARM support.  For anyone who is interested, here is the solution:

    The answer is using the --bss_threshold option when compiling.  The documentation on this option makes it seem like the only two options are: --bss_threshold=0 or --bss_threshold=8...

    [font=Verdana, Tahoma, Arial, Helvetica, sans-serif][size=2]
    Syntax
    [/size][/font][font=Verdana, Tahoma, Arial, Helvetica, sans-serif][size=2]--bss_threshold=numWhere:

    numis either:

    0place small global ZI data items in ZI data sections

    8place small global ZI data items in RW data sections.

    [/size][/font]



    It turns out, however, that the compiler is actually capable of accepting anything up to the maximum int, and anything below that size in bytes will be put into RW data instead of BSS.

    Regards,
    Meiyo
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