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Debug build works but release

Yu Qiao
Note: This was originally posted on 19th January 2010 at http://forums.arm.com

My code works on debug build ( -Otime -g+ )
But release build can't work (  -Otime -O2 -zo )
the code is the same. the compiler is ADS1.2

Do you guys have any idea or previous experience on such an issue?

Thanks.
Parents
  • Arm Employee Badge
    Note: This was originally posted on 19th January 2010 at http://forums.arm.com

    Presumably changing the "RAM settings" involves writing specific values to specific addresses;
    compiling with "-O2 -g+" will have the effect of causing accesses to behave as though volatile, whilst this behaviour will be optimised out with "-O2 -Otime"; for example:

    void foo(void)
    {
      unsigned char *f = (unsigned char *)0x100;
      *f = 2;
      *f = 4;
      *f = 6;
    }

    Generates three write accesses with debug, but only writes "6" without debug enabled.
    Declaring f as "volatile unsigned char*", will result in all three writes always being generated.

    If you are talking to peripherals, are you sure you're using the volatile specifier correctly?

    hth
    s.
Reply
  • Arm Employee Badge
    Note: This was originally posted on 19th January 2010 at http://forums.arm.com

    Presumably changing the "RAM settings" involves writing specific values to specific addresses;
    compiling with "-O2 -g+" will have the effect of causing accesses to behave as though volatile, whilst this behaviour will be optimised out with "-O2 -Otime"; for example:

    void foo(void)
    {
      unsigned char *f = (unsigned char *)0x100;
      *f = 2;
      *f = 4;
      *f = 6;
    }

    Generates three write accesses with debug, but only writes "6" without debug enabled.
    Declaring f as "volatile unsigned char*", will result in all three writes always being generated.

    If you are talking to peripherals, are you sure you're using the volatile specifier correctly?

    hth
    s.
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