clang/test/Layout/v6-empty.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -fclang-abi-compat=6 -triple x86_64-linux-gnu -fdump-record-layouts %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V6
   2 // RUN: %clang_cc1 -fsyntax-only -fclang-abi-compat=7 -triple x86_64-linux-gnu -fdump-record-layouts %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V7
   3
   4 // In Clang 6 and before, we determined that Nonempty was empty, so we
   5 // applied EBO to it.
   6 struct Nonempty { int : 4; };
   7 struct A : Nonempty { int n; };
   8 int k = sizeof(A);
   9
  10 // CHECK:*** Dumping AST Record Layout
  11 // CHECK:             0 | struct A
  12 // CHECK-V6-NEXT:     0 |   struct Nonempty (base) (empty)
  13 // CHECK-V7-NEXT:     0 |   struct Nonempty (base){{$}}
  14 // CHECK-NEXT:    0:0-3 |     int
  15 // CHECK-V6-NEXT:     0 |   int n
  16 // CHECK-V7-NEXT:     4 |   int n
  17 // CHECK-V6-NEXT:       | [sizeof=4, dsize=4, align=4,
  18 // CHECK-V6-NEXT:       |  nvsize=4, nvalign=4]
  19 // CHECK-V7-NEXT:       | [sizeof=8, dsize=8, align=4,
  20 // CHECK-V7-NEXT:       |  nvsize=8, nvalign=4]