Require rust >= 1.25 and drop libc_align conditional

This is mostly taken from Josh's work at [1], I just updated to account
for conflicts and new uses of `libc_align`.

[1]: rust-lang#2845

Co-authored-by: Josh Triplett <josh@joshtriplett.org>

(apply <rust-lang#4057> to `main`)
(cherry picked from commit b5b553d)

As part of this update, drop the `align` feature from Cargo.toml and
libc-test.

Cargo.toml

@@ -139,8 +139,7 @@ rustc-std-workspace-core = { version = "1.0.0", optional = true }
 [features]
 default = ["std"]
 std = []
-align = []
-rustc-dep-of-std = ['align', 'rustc-std-workspace-core']
+rustc-dep-of-std = ["rustc-std-workspace-core"]
 extra_traits = []
 const-extern-fn = []
 

libc-test/Cargo.toml

@@ -24,7 +24,6 @@ ctest2 = "0.4.3"
 [features]
 default = ["std"]
 std = ["libc/std"]
-align = ["libc/align"]
 extra_traits = ["libc/extra_traits"]
 
 [[test]]

src/fuchsia/mod.rs

@@ -697,7 +697,7 @@ s! {
         pub direction: ::__u16,
         pub trigger: ff_trigger,
         pub replay: ff_replay,
-        // FIXME this is actually a union
+        // FIXME(1.0): this is actually a union
         #[cfg(target_pointer_width = "64")]
         pub u: [u64; 4],
         #[cfg(target_pointer_width = "32")]
@@ -882,6 +882,35 @@ s! {
         pub ipi6_addr: ::in6_addr,
         pub ipi6_ifindex: ::c_uint,
     }
+
+    #[cfg_attr(
+        any(
+            target_pointer_width = "32",
+            target_arch = "x86_64"
+        ),
+        repr(align(4)))]
+    #[cfg_attr(
+        not(any(
+            target_pointer_width = "32",
+            target_arch = "x86_64"
+        )),
+        repr(align(8)))]
+    pub struct pthread_mutexattr_t {
+        size: [u8; ::__SIZEOF_PTHREAD_MUTEXATTR_T],
+    }
+
+    #[cfg_attr(target_pointer_width = "32",
+               repr(align(4)))]
+    #[cfg_attr(target_pointer_width = "64",
+               repr(align(8)))]
+    pub struct pthread_rwlockattr_t {
+        size: [u8; ::__SIZEOF_PTHREAD_RWLOCKATTR_T],
+    }
+
+    #[repr(align(4))]
+    pub struct pthread_condattr_t {
+        size: [u8; ::__SIZEOF_PTHREAD_CONDATTR_T],
+    }
 }
 
 s_no_extra_traits! {
@@ -979,6 +1008,42 @@ s_no_extra_traits! {
         pub sigev_notify_attributes: *mut pthread_attr_t,
         pub __pad: [::c_char; 56 - 3 * 8 /* 8 == sizeof(long) */],
     }
+
+    #[cfg_attr(all(target_pointer_width = "32",
+                   any(target_arch = "arm",
+                       target_arch = "x86_64")),
+               repr(align(4)))]
+    #[cfg_attr(any(target_pointer_width = "64",
+                   not(any(target_arch = "arm",
+                           target_arch = "x86_64"))),
+               repr(align(8)))]
+    pub struct pthread_mutex_t {
+        size: [u8; ::__SIZEOF_PTHREAD_MUTEX_T],
+    }
+
+    #[cfg_attr(all(target_pointer_width = "32",
+                   any(target_arch = "arm",
+                       target_arch = "x86_64")),
+               repr(align(4)))]
+    #[cfg_attr(any(target_pointer_width = "64",
+                   not(any(target_arch = "arm",
+                           target_arch = "x86_64"))),
+               repr(align(8)))]
+    pub struct pthread_rwlock_t {
+        size: [u8; ::__SIZEOF_PTHREAD_RWLOCK_T],
+    }
+
+    #[cfg_attr(target_pointer_width = "32",
+               repr(align(4)))]
+    #[cfg_attr(target_pointer_width = "64",
+               repr(align(8)))]
+    #[cfg_attr(target_arch = "x86",
+               repr(align(4)))]
+    #[cfg_attr(not(target_arch = "x86"),
+               repr(align(8)))]
+    pub struct pthread_cond_t {
+        size: [u8; ::__SIZEOF_PTHREAD_COND_T],
+    }
 }
 
 cfg_if! {
@@ -1306,6 +1371,72 @@ cfg_if! {
                 self.sigev_notify_attributes.hash(state);
             }
         }
+
+        impl PartialEq for pthread_cond_t {
+            fn eq(&self, other: &pthread_cond_t) -> bool {
+                self.size
+                    .iter()
+                    .zip(other.size.iter())
+                    .all(|(a,b)| a == b)
+            }
+        }
+        impl Eq for pthread_cond_t {}
+        impl ::fmt::Debug for pthread_cond_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("pthread_cond_t")
+                    // FIXME: .field("size", &self.size)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for pthread_cond_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.size.hash(state);
+            }
+        }
+
+        impl PartialEq for pthread_mutex_t {
+            fn eq(&self, other: &pthread_mutex_t) -> bool {
+                self.size
+                    .iter()
+                    .zip(other.size.iter())
+                    .all(|(a,b)| a == b)
+            }
+        }
+        impl Eq for pthread_mutex_t {}
+        impl ::fmt::Debug for pthread_mutex_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("pthread_mutex_t")
+                    // FIXME: .field("size", &self.size)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for pthread_mutex_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.size.hash(state);
+            }
+        }
+
+        impl PartialEq for pthread_rwlock_t {
+            fn eq(&self, other: &pthread_rwlock_t) -> bool {
+                self.size
+                    .iter()
+                    .zip(other.size.iter())
+                    .all(|(a,b)| a == b)
+            }
+        }
+        impl Eq for pthread_rwlock_t {}
+        impl ::fmt::Debug for pthread_rwlock_t {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                f.debug_struct("pthread_rwlock_t")
+                    // FIXME: .field("size", &self.size)
+                    .finish()
+            }
+        }
+        impl ::hash::Hash for pthread_rwlock_t {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                self.size.hash(state);
+            }
+        }
     }
 }
 
@@ -4355,10 +4486,3 @@ cfg_if! {
         // Unknown target_arch
     }
 }
-
-#[macro_use]
-mod align;
-
-expand_align!();
-
-pub use ffi::c_void;

src/macros.rs

@@ -273,9 +273,3 @@ macro_rules! __item {
         $i
     };
 }
-
-macro_rules! ptr_addr_of {
-    ($place:expr) => {
-        ::core::ptr::addr_of!($place)
-    };
-}

src/unix/bsd/apple/b32/mod.rs

@@ -59,6 +59,12 @@ s_no_extra_traits! {
         __sig: c_long,
         __opaque: [::c_char; ::__PTHREAD_ONCE_SIZE__],
     }
+
+    #[allow(missing_debug_implementations)]
+    #[repr(align(16))]
+    pub struct max_align_t {
+        priv_: [f64; 2]
+    }
 }
 
 cfg_if! {
@@ -145,6 +151,3 @@ extern "C" {
         options: ::c_ulong,
     ) -> ::c_int;
 }
-
-mod align;
-pub use self::align::*;