will __attribute__((aligned(CACHE_LINE_SIZE))) break struct alignment

Yubin Ruan ablacktshirt@gmail.com
Mon Nov 6 05:04:00 GMT 2017


Hi,

I am using something like this:

  struct S1 {
    int index __attribute__((aligned(CACHE_LINE_SIZE)));
    struct S2 some_other;
  };

I am not using anything like `#pragma pack`.

I am wondering whether adding that
`__attribute__((aligned(CACHE_LINE_SIZE)))` will break GCC's automatic
alignment for S1 and S2. Can anyone point me to any document which
specify this behavior?

Thanks,
Yubin



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