Apple clang version 11.0.0 (clang-1100.0.33.17)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
#define A __attribute__((aligned(64)))

({ A int **p; __alignof(p); }) = 64
({ int A **p; __alignof(p); }) = 64
({ int * A *p; __alignof(p); }) = 64
({ int ** A p; __alignof(p); }) = 64
({ int ** p A; __alignof(p); }) = 64

({ A int **p; __alignof(*p); }) = 8
({ int A **p; __alignof(*p); }) = 8
({ int * A *p; __alignof(*p); }) = 8
({ int ** A p; __alignof(*p); }) = 8
({ int ** p A; __alignof(*p); }) = 8

({ A int **p; __alignof(**p); }) = 4
({ int A **p; __alignof(**p); }) = 4
({ int * A *p; __alignof(**p); }) = 4
({ int ** A p; __alignof(**p); }) = 4
({ int ** p A; __alignof(**p); }) = 4

gcc-11.2 (GCC) 11.2.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#define A __attribute__((aligned(64)))

({ A int **p; __alignof(p); }) = 64
({ int A **p; __alignof(p); }) = 64
({ int * A *p; __alignof(p); }) = 8
({ int ** A p; __alignof(p); }) = 64
({ int ** p A; __alignof(p); }) = 64

({ A int **p; __alignof(*p); }) = 8
({ int A **p; __alignof(*p); }) = 8
({ int * A *p; __alignof(*p); }) = 64
({ int ** A p; __alignof(*p); }) = 8
({ int ** p A; __alignof(*p); }) = 8

({ A int **p; __alignof(**p); }) = 4
({ int A **p; __alignof(**p); }) = 4
({ int * A *p; __alignof(**p); }) = 4
({ int ** A p; __alignof(**p); }) = 4
({ int ** p A; __alignof(**p); }) = 4