Add back on_gba

Cargo.toml

@@ -7,6 +7,12 @@ edition = "2021"
 license = "Zlib OR Apache-2.0 OR MIT"
 
 [features]
+default = ["on_gba"]
+# SEE THE CRATE DOCS FOR SAFETY RELATED INFO REGARDING THIS FEATURE.
+on_gba = []
+# utilize `doc_cfg` where appropriate. requires nightly. intended mostly for use
+# during docs.rs documentation generation.
+doc_cfg = []
 # Activates the `track_caller` attribute on various functions. Use of the
 # `track_caller` attribute on a function adds a "secret" extra argument for the
 # `Location` of the caller, which can reduce performance if the function is not
@@ -19,3 +25,4 @@ track_caller = []
 # on the GBA. This is the closest target that docs.rs supports by default and
 # which *also* supports the `instruction_set` attribute to avoid build errors.
 targets = ["armv5te-unknown-linux-gnueabi"]
+features = ["doc_cfg"]

src/lib.rs

@@ -34,6 +34,7 @@ unsafe impl<T> GbaCellSafe for T where T: Copy {}
 #[repr(transparent)]
 pub struct GbaCell<T>(core::cell::UnsafeCell<T>);
 
+#[cfg(feature = "on_gba")]
 impl<T> Debug for GbaCell<T>
 where
     T: GbaCellSafe + Debug,
@@ -53,6 +54,7 @@ where
         Self::new(T::default())
     }
 }
+#[cfg(feature = "on_gba")]
 impl<T> Clone for GbaCell<T>
 where
     T: GbaCellSafe + Default,
@@ -64,6 +66,7 @@ where
     }
 }
 
+#[cfg(feature = "on_gba")]
 unsafe impl<T> Sync for GbaCell<T> {}
 
 impl<T> GbaCell<T>
@@ -93,6 +96,7 @@ where
     /// Read the value in the cell.
     #[inline]
     #[must_use]
+    #[cfg(feature = "on_gba")]
     #[cfg_attr(feature = "track_caller", track_caller)]
     pub fn read(&self) -> T {
         // SAFETY: Guranteed to meet the size & alignment requirements of the
@@ -102,6 +106,7 @@ where
 
     /// Writes a new value to the cell.
     #[inline]
+    #[cfg(feature = "on_gba")]
     #[cfg_attr(feature = "track_caller", track_caller)]
     pub fn write(&self, t: T) {
         // SAFETY: Guranteed to meet the size & alignment requirements of the