cfg-guard things that don't work on OS versions

Author: madsmtm

.github/workflows/ci.yml

@@ -206,7 +206,10 @@ jobs:
     - name: Setup SDK environment
       if: matrix.sdk
       # This changes a variable, so is only set when a custom SDK is used
-      run: echo "SDKROOT=$HOME/extern/sdk" >> $GITHUB_ENV
+      run: |
+        echo "SDKROOT=$HOME/extern/sdk" >> $GITHUB_ENV
+        # Temporary
+        echo "RUSTFLAGS=$RUSTFLAGS --cfg=macos_10_7" >> $GITHUB_ENV
 
     - name: Install Clang & Valgrind
       if: contains(matrix.os, 'ubuntu')

objc2-foundation/examples/declaration.rs

@@ -1,18 +1,22 @@
+#[cfg(all(feature = "apple", target_os = "macos"))]
 use objc2::{
     msg_send, msg_send_id,
     rc::{Id, Shared},
     runtime::{Bool, Object},
 };
+#[cfg(all(feature = "apple", target_os = "macos"))]
 use objc2_foundation::{declare_class, extern_class, NSObject};
 
 #[cfg(all(feature = "apple", target_os = "macos"))]
 #[link(name = "AppKit", kind = "framework")]
 extern "C" {}
 
+#[cfg(all(feature = "apple", target_os = "macos"))]
 extern_class! {
     unsafe struct NSResponder: NSObject;
 }
 
+#[cfg(all(feature = "apple", target_os = "macos"))]
 declare_class! {
     unsafe struct CustomAppDelegate: NSResponder, NSObject {
         pub ivar: u8,
@@ -66,6 +70,7 @@ declare_class! {
     }
 }
 
+#[cfg(all(feature = "apple", target_os = "macos"))]
 impl CustomAppDelegate {
     pub fn new(ivar: u8, another_ivar: bool) -> Id<Self, Shared> {
         let cls = Self::class();
@@ -80,9 +85,15 @@ impl CustomAppDelegate {
     }
 }
 
+#[cfg(all(feature = "apple", target_os = "macos"))]
 fn main() {
     let delegate = CustomAppDelegate::new(42, true);
 
     println!("{}", delegate.ivar);
     println!("{}", delegate.another_ivar.as_bool());
 }
+
+#[cfg(not(all(feature = "apple", target_os = "macos")))]
+fn main() {
+    panic!("This example uses AppKit, which is only present on macOS");
+}

objc2-foundation/examples/nspasteboard.rs

@@ -7,7 +7,7 @@ use std::ops::{Deref, DerefMut};
 
 use objc2::rc::{Id, Shared};
 use objc2::runtime::{Class, Object};
-use objc2::{class, msg_send, msg_send_bool, msg_send_id};
+use objc2::{msg_send, msg_send_bool, msg_send_id};
 use objc2::{Encoding, Message, RefEncode};
 
 use objc2_foundation::{NSArray, NSDictionary, NSInteger, NSObject, NSString};
@@ -59,7 +59,14 @@ impl DerefMut for NSPasteboard {
 impl NSPasteboard {
     /// Common convenience method.
     pub fn class() -> &'static Class {
-        class!(NSPasteboard)
+        #[cfg(all(feature = "apple", target_os = "macos"))]
+        {
+            objc2::class!(NSPasteboard)
+        }
+        #[cfg(not(all(feature = "apple", target_os = "macos")))]
+        {
+            panic!("this example only works on macOS")
+        }
     }
 
     /// We return a `Shared` `Id` because `general` can easily be called

objc2-foundation/examples/nsspeechsynthesizer.rs

@@ -8,7 +8,7 @@ use std::time::Duration;
 
 use objc2::rc::{Id, Owned};
 use objc2::runtime::Class;
-use objc2::{class, msg_send, msg_send_bool, msg_send_id};
+use objc2::{msg_send, msg_send_bool, msg_send_id};
 use objc2::{Encoding, Message, RefEncode};
 
 use objc2_foundation::{NSObject, NSString};
@@ -47,7 +47,14 @@ impl DerefMut for NSSpeechSynthesizer {
 // TODO: Unsure about when to use `&mut` here?
 impl NSSpeechSynthesizer {
     pub fn class() -> &'static Class {
-        class!(NSSpeechSynthesizer)
+        #[cfg(all(feature = "apple", target_os = "macos"))]
+        {
+            objc2::class!(NSSpeechSynthesizer)
+        }
+        #[cfg(not(all(feature = "apple", target_os = "macos")))]
+        {
+            panic!("this example only works on macOS")
+        }
     }
 
     // Uses default voice

objc2-foundation/src/lib.rs

@@ -66,6 +66,7 @@ pub use self::process_info::NSProcessInfo;
 pub use self::range::NSRange;
 pub use self::string::NSString;
 pub use self::thread::{is_main_thread, is_multi_threaded, MainThreadMarker, NSThread};
+#[cfg(not(macos_10_7))] // Temporary
 pub use self::uuid::NSUUID;
 pub use self::value::NSValue;
 pub use self::zone::NSZone;
@@ -112,6 +113,8 @@ mod process_info;
 mod range;
 mod string;
 mod thread;
+// Temporarily disable testing UUID on macOS 10.7 until
+#[cfg(not(macos_10_7))]
 mod uuid;
 mod value;
 mod zone;
@@ -175,6 +178,7 @@ mod tests {
         assert_auto_traits::<NSString>();
         assert_unwindsafe::<MainThreadMarker>(); // Intentional
         assert_auto_traits::<NSThread>();
+        #[cfg(not(macos_10_7))]
         assert_auto_traits::<NSUUID>();
         assert_auto_traits::<NSValue<i32>>();
         assert_unwindsafe::<NSZone>(); // Intentional

objc2-foundation/src/uuid.rs

@@ -15,6 +15,8 @@ extern_class! {
     /// Conversion methods to/from UUIDs from the `uuid` crate can be
     /// enabled with the `uuid` crate feature.
     ///
+    /// macOS: This is only available on 10.8 and above.
+    ///
     /// See [Apple's documentation](https://developer.apple.com/documentation/foundation/nsuuid?language=objc).
     #[derive(PartialEq, Eq, Hash)]
     unsafe pub struct NSUUID: NSObject;

objc2/examples/talk_to_me.rs

@@ -3,22 +3,29 @@
 //! **Untested**!
 //!
 //! Works on macOS >= 10.15 or iOS > 7.0!
-use objc2::ffi::NSUInteger;
-use objc2::rc::{Id, Owned, Shared};
-use objc2::runtime::Object;
-use objc2::{class, msg_send, msg_send_bool, msg_send_id};
-use std::ffi::c_void;
 
-#[cfg(feature = "apple")]
-#[link(name = "AVFoundation", kind = "framework")]
-extern "C" {}
-#[cfg(feature = "apple")]
-#[link(name = "Foundation", kind = "framework")]
-extern "C" {}
-
-const UTF8_ENCODING: NSUInteger = 4;
+#[cfg(not(talk_to_me_example))]
+fn main() {
+    panic!("pass the `--cfg talk_to_me_example` flag to run this example!");
+}
 
+#[cfg(talk_to_me_example)]
 fn main() {
+    use objc2::ffi::NSUInteger;
+    use objc2::rc::{Id, Owned, Shared};
+    use objc2::runtime::Object;
+    use objc2::{class, msg_send, msg_send_bool, msg_send_id};
+    use std::ffi::c_void;
+
+    #[cfg(feature = "apple")]
+    #[link(name = "AVFoundation", kind = "framework")]
+    extern "C" {}
+    #[cfg(feature = "apple")]
+    #[link(name = "Foundation", kind = "framework")]
+    extern "C" {}
+
+    const UTF8_ENCODING: NSUInteger = 4;
+
     let text = "Hello from Rust!";
 
     // Note: objc2-foundation has functionality to do this safely!