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Does the variable attribute structure have to be a multiple of 4 bytes in size?

April 26, 2017bytes size structure

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Does the variable attribute structure have to be a multiple of 4 bytes in size?

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Yes. This is to ensure that all attributes start at a 4-aligned address. If this is not present, then system crashes with bus error. That is because the attribute is internally typecasted to a pointer and accessed as one, and if it is not 4-byte aligned, then the access causes a crash.