From 99cd14d7e1fccc59c587ca89400f181413293d4f Mon Sep 17 00:00:00 2001
From: Mads Marquart <mads@marquart.dk>
Date: Wed, 27 Jul 2022 03:58:42 +0200
Subject: [PATCH] cfg-guard things that don't work on older macOS versions

---
 .github/workflows/ci.yml                 |  5 +++-
 objc2-foundation/examples/declaration.rs | 11 ++++++++
 objc2-foundation/src/lib.rs              |  3 +++
 objc2-foundation/src/uuid.rs             |  2 ++
 objc2/examples/talk_to_me.rs             | 33 ++++++++++++++----------
 5 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d1e5acae..942823487 100644
--- a/.github/workflows/ci.yml
+++ b/.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')
diff --git a/objc2-foundation/examples/declaration.rs b/objc2-foundation/examples/declaration.rs
index 9e18ff06b..06d9eb4bb 100644
--- a/objc2-foundation/examples/declaration.rs
+++ b/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");
+}
diff --git a/objc2-foundation/src/lib.rs b/objc2-foundation/src/lib.rs
index fc0dc0f03..952ae754a 100644
--- a/objc2-foundation/src/lib.rs
+++ b/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;
diff --git a/objc2-foundation/src/uuid.rs b/objc2-foundation/src/uuid.rs
index 71f413de1..726ffe641 100644
--- a/objc2-foundation/src/uuid.rs
+++ b/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;
diff --git a/objc2/examples/talk_to_me.rs b/objc2/examples/talk_to_me.rs
index c2e5ac87a..e3a4b387b 100644
--- a/objc2/examples/talk_to_me.rs
+++ b/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!