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a8b0c6fa28
The packed attribute can still be useful in this case if the struct is then placed inside another packed struct - the non-pod element type's packed attribute declares that it's OK to misalign this element inside the packed structure. (otherwise the non-pod element is not packed/its alignment is preserved, as per D117616/2771233) Fixes PR62353 Differential Revision: https://reviews.llvm.org/D149182
33 lines
879 B
C++
33 lines
879 B
C++
// RUN: %clang_cc1 -triple powerpc-ibm-aix-xcoff -Wpacked \
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// RUN: -fdump-record-layouts -fsyntax-only -verify -x c++ < %s | \
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// RUN: FileCheck %s
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// RUN: %clang_cc1 -triple powerpc64-ibm-aix-xcoff -Wpacked \
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// RUN: -fdump-record-layouts -fsyntax-only -verify -x c++ < %s | \
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// RUN: FileCheck %s
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// expected-no-diagnostics
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struct A {
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double d;
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};
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struct B {
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char x[8];
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};
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struct [[gnu::packed]] C : B, A {
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char x alignas(4)[8];
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};
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int b = sizeof(C);
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// CHECK: 0 | struct C
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// CHECK-NEXT: 0 | struct B (base)
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// CHECK-NEXT: 0 | char[8] x
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// CHECK-NEXT: 8 | struct A (base)
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// CHECK-NEXT: 8 | double d
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// CHECK-NEXT: 16 | char[8] x
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// CHECK-NEXT: | [sizeof=24, dsize=24, align=4, preferredalign=4,
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// CHECK-NEXT: | nvsize=24, nvalign=4, preferrednvalign=4]
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