[cfe-dev] c++11's alignas() ignored inside #pragma pack

[jahanian]

Implementation says that it is intentional:

  // The maximum field alignment overrides the aligned attribute.
  if (!MaxFieldAlignment.isZero()) {
    FieldAlign = std::min(FieldAlign, MaxFieldAlignment);
    UnpackedFieldAlign = std::min(UnpackedFieldAlign, MaxFieldAlignment);
  }
- Fariborz

On Jul 22, 2014, at 11:04 AM, jahanian <fjahanian at apple.com> wrote:

> This test shows that alignas() is ignored when used with #pragma.
> Is this intentional behavior?
> 
> #pragma pack(push, 1)
> struct S1 { char a; short b; double c; alignas(32) double d; char e; double f; };
> #pragma pack(pop)
> 
> int main()
> {
>  return sizeof(struct S1);
> }
> 
> - Thanks, Fariborz
> 
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