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MSVC takes required alignment of child types into account #437

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TwoClocks opened this issue Nov 26, 2022 · 0 comments

Open

Tracked by

MSVC takes required alignment of child types into account #437

TwoClocks opened this issue Nov 26, 2022 · 0 comments

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TwoClocks commented Nov 26, 2022

MSVC seems to walk down the type stack.

__declspec(align(8)) typedef int I1;
__declspec(align(1)) typedef I1 I2;

_Static_assert(sizeof(I1) == 4, "");
_Static_assert(_Alignof(I1) == 8, "");
_Static_assert(sizeof(I2) == 4, "");
_Static_assert(_Alignof(I2) == 8, "");

where GCC/Clang don't

typedef int I1 __attribute__((aligned(8)));
typedef I1 I2 __attribute__((aligned(1)));

_Static_assert(sizeof(I1) == 4, "");
_Static_assert(_Alignof(I1) == 8, "");
_Static_assert(sizeof(I2) == 4, "");
_Static_assert(_Alignof(I2) == 1, "");

This was referenced Nov 26, 2022

Attribute: handle typedef decreasing record alignment #433

Closed

Record Layout meta tracking issue. #387

Open

Vexu added the enhancement label

ehaas mentioned this issue

Proposal: treat typedef types as separate type specifier #733

Closed

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