http://llvm.org/bugs/show_bug.cgi?id=20418
Bug ID: 20418
Summary: MS ABI: __declspec(align(N)) ignored inside pragma
pack when applied to a non-record type
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Classification: Unclassified
Consider:
typedef __declspec(align(4)) int my_int_t;
#pragma pack(1)
struct A {
char a;
my_int_t x;
};
static_assert(sizeof(A) == 8, "");
MSVC record layout tracks two kinds of alignment: required and natural
alignment. Inside pragma pack, "required" alignment (alignment from
attributes) trumps the pragma pack alignment. However, only records have a
concept of required alignment. Typedefs of scalar types can also have a
required alignment, and we need to track it.
We would also need to track this in the Itanium C++ record layout code if we
want to implement this there, either in general or under ms_struct, as
discussed here:
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-July/038193.html
getTypeInfo should probably be augmented to return more information: size,
natural alignment, required alignment.
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