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>

Cargo.toml

@@ -138,10 +138,13 @@ rustc-std-workspace-core = { version = "1.0.0", optional = true }
 [features]
 default = ["std"]
 std = []
-align = []
 rustc-dep-of-std = ['align', 'rustc-std-workspace-core']
 extra_traits = []
 const-extern-fn = []
+
+# `align` is deprecated and no longer does anything
+align = []
+
 # use_std is deprecated, use `std` instead
 use_std = ['std']
 

build.rs

@@ -14,7 +14,6 @@ const ALLOWED_CFGS: &'static [&'static str] = &[
     "freebsd13",
     "freebsd14",
     "freebsd15",
-    "libc_align",
     "libc_cfg_target_vendor",
     "libc_const_extern_fn",
     "libc_const_extern_fn_unstable",
@@ -51,7 +50,6 @@ fn main() {
 
     let (rustc_minor_ver, is_nightly) = rustc_minor_nightly();
     let rustc_dep_of_std = env::var("CARGO_FEATURE_RUSTC_DEP_OF_STD").is_ok();
-    let align_cargo_feature = env::var("CARGO_FEATURE_ALIGN").is_ok();
     let const_extern_fn_cargo_feature = env::var("CARGO_FEATURE_CONST_EXTERN_FN").is_ok();
     let libc_ci = env::var("LIBC_CI").is_ok();
     let libc_check_cfg = env::var("LIBC_CHECK_CFG").is_ok() || rustc_minor_ver >= 80;
@@ -96,11 +94,6 @@ fn main() {
         set_cfg("libc_deny_warnings");
     }
 
-    // Rust >= 1.25 supports repr(align):
-    if rustc_minor_ver >= 25 || rustc_dep_of_std || align_cargo_feature {
-        set_cfg("libc_align");
-    }
-
     // Rust >= 1.26 supports i128 and u128:
     if rustc_minor_ver >= 26 || rustc_dep_of_std {
         set_cfg("libc_int128");

libc-test/build.rs

@@ -67,12 +67,7 @@ fn do_ctest() {
 
 fn ctest_cfg() -> ctest::TestGenerator {
     let mut cfg = ctest::TestGenerator::new();
-    let libc_cfgs = [
-        "libc_align",
-        "libc_core_cvoid",
-        "libc_packedN",
-        "libc_thread_local",
-    ];
+    let libc_cfgs = ["libc_core_cvoid", "libc_packedN", "libc_thread_local"];
     for f in &libc_cfgs {
         cfg.cfg(f, None);
     }

src/fuchsia/mod.rs

@@ -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);
+            }
+        }
     }
 }
 
@@ -2315,17 +2446,15 @@ pub const RTLD_NOW: ::c_int = 0x2;
 
 pub const TCP_MD5SIG: ::c_int = 14;
 
-align_const! {
-    pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
-        size: [0; __SIZEOF_PTHREAD_MUTEX_T],
-    };
-    pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
-        size: [0; __SIZEOF_PTHREAD_COND_T],
-    };
-    pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
-        size: [0; __SIZEOF_PTHREAD_RWLOCK_T],
-    };
-}
+pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
+    size: [0; __SIZEOF_PTHREAD_MUTEX_T],
+};
+pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
+    size: [0; __SIZEOF_PTHREAD_COND_T],
+};
+pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
+    size: [0; __SIZEOF_PTHREAD_RWLOCK_T],
+};
 pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
 pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 2;
@@ -4362,17 +4491,6 @@ cfg_if! {
     }
 }
 
-cfg_if! {
-    if #[cfg(libc_align)] {
-        #[macro_use]
-        mod align;
-    } else {
-        #[macro_use]
-        mod no_align;
-    }
-}
-expand_align!();
-
 cfg_if! {
     if #[cfg(libc_core_cvoid)] {
         pub use ::ffi::c_void;