https://bugs.llvm.org/show_bug.cgi?id=48777
Bug ID: 48777
Summary: Wrong alignment of nested __declspec(align)s
Product: clang
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Consider:
__declspec(align(8)) typedef int I1;
__declspec(align(1)) typedef I1 I2;
struct X {
I2 i;
};
int f(void) {
return _Alignof(struct X);
}
msvc returns 8, clang returns 4 on the target x86_64-pc-windows-msvc. The
problem is that [1] ignores all typedefs and [2] only considers the outermost
typedef.
[1]
https://github.com/llvm/llvm-project/blob/a048ce13e32daa255d26533c00da8abd0b67e819/clang/lib/AST/RecordLayoutBuilder.cpp#L2586-L2587
[2]
https://github.com/llvm/llvm-project/blob/a048ce13e32daa255d26533c00da8abd0b67e819/clang/lib/AST/RecordLayoutBuilder.cpp#L2593-L2595
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