diff options
Diffstat (limited to 'test/SemaCXX/class-layout.cpp')
| -rw-r--r-- | test/SemaCXX/class-layout.cpp | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/test/SemaCXX/class-layout.cpp b/test/SemaCXX/class-layout.cpp index 96552de1cbe25..5403bd6e6a6f6 100644 --- a/test/SemaCXX/class-layout.cpp +++ b/test/SemaCXX/class-layout.cpp @@ -1,5 +1,6 @@ // RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -fsyntax-only -verify -std=c++98 -Wno-inaccessible-base // RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -fsyntax-only -verify -std=c++11 -Wno-inaccessible-base +// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -fsyntax-only -verify -std=c++11 -Wno-inaccessible-base -fclang-abi-compat=6 -DCLANG_ABI_COMPAT=6 // expected-no-diagnostics #define SA(n, p) int a##n[(p) ? 1 : -1] @@ -570,3 +571,36 @@ namespace test18 { SA(0, sizeof(might_use_tail_padding) == 80); } } // namespace PR16537 + +namespace PR37275 { + struct X { char c; }; + + struct A { int n; }; + _Static_assert(_Alignof(A) == _Alignof(int), ""); + + // __attribute__((packed)) does not apply to base classes. + struct __attribute__((packed)) B : X, A {}; +#if defined(CLANG_ABI_COMPAT) && CLANG_ABI_COMPAT <= 6 + _Static_assert(_Alignof(B) == 1, ""); + _Static_assert(__builtin_offsetof(B, n) == 1, ""); +#else + _Static_assert(_Alignof(B) == _Alignof(int), ""); + _Static_assert(__builtin_offsetof(B, n) == 4, ""); +#endif + + // #pragma pack does, though. +#pragma pack(push, 2) + struct C : X, A {}; + _Static_assert(_Alignof(C) == 2, ""); + _Static_assert(__builtin_offsetof(C, n) == 2, ""); + + struct __attribute__((packed)) D : X, A {}; +#if defined(CLANG_ABI_COMPAT) && CLANG_ABI_COMPAT <= 6 + _Static_assert(_Alignof(D) == 1, ""); + _Static_assert(__builtin_offsetof(D, n) == 1, ""); +#else + _Static_assert(_Alignof(D) == 2, ""); + _Static_assert(__builtin_offsetof(D, n) == 2, ""); +#endif +#pragma pack(pop) +} |