make memcmp return a value of c_int_width instead of i32

Author: drmorr0

core/src/ffi/mod.rs

@@ -57,6 +57,9 @@ type_alias! { "c_schar.md", c_schar = i8, NonZero_c_schar = NonZeroI8; }
 type_alias! { "c_uchar.md", c_uchar = u8, NonZero_c_uchar = NonZeroU8; }
 type_alias! { "c_short.md", c_short = i16, NonZero_c_short = NonZeroI16; }
 type_alias! { "c_ushort.md", c_ushort = u16, NonZero_c_ushort = NonZeroU16; }
+#[cfg(any(target_arch = "avr", target_arch = "msp430"))]
+type_alias! { "c_int.md", c_int = i16, NonZero_c_int = NonZeroI16; }
+#[cfg(not(any(target_arch = "avr", target_arch = "msp430")))]
 type_alias! { "c_int.md", c_int = i32, NonZero_c_int = NonZeroI32; }
 type_alias! { "c_uint.md", c_uint = u32, NonZero_c_uint = NonZeroU32; }
 type_alias! { "c_long.md", c_long = i32, NonZero_c_long = NonZeroI32;

core/src/slice/cmp.rs

@@ -1,6 +1,7 @@
 //! Comparison traits for `[T]`.
 
 use crate::cmp::{self, Ordering};
+use crate::ffi;
 use crate::mem;
 
 use super::from_raw_parts;
@@ -13,8 +14,7 @@ extern "C" {
     ///
     /// Returns 0 for equal, < 0 for less than and > 0 for greater
     /// than.
-    // FIXME(#32610): Return type should be c_int
-    fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32;
+    fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> ffi::c_int;
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]