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    macro_rules! expand_align {
        () => {
            s! {
                #[cfg_attr(any(target_pointer_width = "32",
                               target_arch = "x86_64",
                               target_arch = "powerpc64",
                               target_arch = "mips64",
                               target_arch = "s390x",
                               target_arch = "sparc64",
                               target_arch = "aarch64"),
                           repr(align(4)))]
                #[cfg_attr(not(any(target_pointer_width = "32",
                                   target_arch = "x86_64",
                                   target_arch = "powerpc64",
                                   target_arch = "mips64",
                                   target_arch = "s390x",
                                   target_arch = "sparc64",
                                   target_arch = "aarch64")),
                           repr(align(8)))]
                pub struct pthread_mutexattr_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_MUTEXATTR_T],
                }

                #[cfg_attr(any(target_env = "musl", target_pointer_width = "32"),
                           repr(align(4)))]
                #[cfg_attr(all(not(target_env = "musl"),
                               target_pointer_width = "64"),
                           repr(align(8)))]
                pub struct pthread_rwlockattr_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_RWLOCKATTR_T],
                }

                #[repr(align(4))]
                pub struct pthread_condattr_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_CONDATTR_T],
                }
            }

            s_no_extra_traits! {
                #[cfg_attr(all(target_env = "musl",
                               target_pointer_width = "32"),
                           repr(align(4)))]
                #[cfg_attr(all(target_env = "musl",
                               target_pointer_width = "64"),
                           repr(align(8)))]
                #[cfg_attr(all(not(target_env = "musl"),
                               target_arch = "x86"),
                           repr(align(4)))]
                #[cfg_attr(all(not(target_env = "musl"),
                               not(target_arch = "x86")),
                           repr(align(8)))]
                pub struct pthread_cond_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_COND_T],
                }

                #[cfg_attr(all(target_pointer_width = "32",
                               any(target_arch = "mips",
                                   target_arch = "arm",
                                   target_arch = "powerpc",
                                   target_arch = "x86_64",
                                   target_arch = "x86")),
                           repr(align(4)))]
                #[cfg_attr(any(target_pointer_width = "64",
                               not(any(target_arch = "mips",
                                       target_arch = "arm",
                                       target_arch = "powerpc",
                                       target_arch = "x86_64",
                                       target_arch = "x86"))),
                           repr(align(8)))]
                pub struct pthread_mutex_t {
                    #[doc(hidden)]
                    size: [u8; ::__SIZEOF_PTHREAD_MUTEX_T],
                }

                #[cfg_attr(all(target_pointer_width = "32",
                               any(target_arch = "mips",
                                   target_arch = "arm",
                                   target_arch = "powerpc",
                                   target_arch = "x86_64",
                                   target_arch = "x86")),
                           repr(align(4)))]
                #[cfg_attr(any(target_pointer_width = "64",
                               not(any(target_arch = "mips",
                                       target_arch = "arm",
                                       target_arch = "powerpc",
                                       target_arch = "x86_64",
                                       target_arch = "x86"))),
                           repr(align(8)))]
                pub struct pthread_rwlock_t {
                    size: [u8; ::__SIZEOF_PTHREAD_RWLOCK_T],
                }
            }
        }
    }

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