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

    yes. all SFR access is protected by volatile.

    Now I'm thinking of the runtime init problem. the phenomenon is also debug version works but release build fails.

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

    yes. all SFR access is protected by volatile.

    Now I'm thinking of the runtime init problem. the phenomenon is also debug version works but release build fails.

    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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