[Darwin] Treat this code as a framework, which simplifies things a li…

…ttle bit. (#20833)

Also move the TimeSpec struct to its own file, this will be necessary
for Xcode 16.

src/Darwin/KernelNotification.cs

@@ -41,13 +41,6 @@
 #endif
 
 namespace Darwin {
-
-	[StructLayout (LayoutKind.Sequential)]
-	public struct TimeSpec {
-		public nint Seconds;
-		public nint NanoSeconds;
-	}
-
 	[StructLayout (LayoutKind.Sequential)]
 	public struct KernelEvent {
 		public IntPtr /* uintptr_tr */ Ident;

src/Darwin/TimeSpec.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Runtime.InteropServices;
+
+using ObjCRuntime;
+
+#nullable enable
+
+namespace Darwin {
+	[StructLayout (LayoutKind.Sequential)]
+	[NativeName ("timespec")]
+	public struct TimeSpec {
+		public nint Seconds;
+		public nint NanoSeconds;
+	}
+}

src/Makefile

@@ -453,15 +453,11 @@ MACOS_CORE_SOURCES += \
 MACOS_DOTNET_SOURCES += \
 	$(MAC_DOTNET_EXTRA_CORE_SOURCES) \
 	$(MACOS_BUILD_DIR)/AssemblyInfo.cs \
-	Darwin/KernelNotification.cs \
-	Darwin/SystemLog.cs \
 	$(SHARED_DESIGNER_CS) \
 
 MACOS_SOURCES += \
 	$(MAC_EXTRA_CORE_SOURCES) \
 	$(MACOS_BUILD_DIR)/AssemblyInfo.cs \
-	Darwin/KernelNotification.cs \
-	Darwin/SystemLog.cs \
 	$(SHARED_DESIGNER_CS) \
 
 # CFNetwork is shipped:

src/build/generator-frameworks.g.cs

@@ -192,6 +192,7 @@ partial class Frameworks {
 		"CoreVideo",
 		"CoreWlan",
 		"CryptoTokenKit",
+		"Darwin",
 		"DeviceCheck",
 		"EventKit",
 		"ExecutionPolicy",
@@ -613,6 +614,7 @@ partial class Frameworks {
 	bool? _CoreVideo;
 	bool? _CoreWlan;
 	bool? _CryptoTokenKit;
+	bool? _Darwin;
 	bool? _DeviceCheck;
 	bool? _DeviceDiscoveryExtension;
 	bool? _DeviceDiscoveryUI;
@@ -782,6 +784,7 @@ partial class Frameworks {
 	public bool HaveCoreVideo { get { if (!_CoreVideo.HasValue) _CoreVideo = GetValue ("CoreVideo"); return _CoreVideo.Value; } }
 	public bool HaveCoreWlan { get { if (!_CoreWlan.HasValue) _CoreWlan = GetValue ("CoreWlan"); return _CoreWlan.Value; } }
 	public bool HaveCryptoTokenKit { get { if (!_CryptoTokenKit.HasValue) _CryptoTokenKit = GetValue ("CryptoTokenKit"); return _CryptoTokenKit.Value; } }
+	public bool HaveDarwin { get { if (!_Darwin.HasValue) _Darwin = GetValue ("Darwin"); return _Darwin.Value; } }
 	public bool HaveDeviceCheck { get { if (!_DeviceCheck.HasValue) _DeviceCheck = GetValue ("DeviceCheck"); return _DeviceCheck.Value; } }
 	public bool HaveDeviceDiscoveryExtension { get { if (!_DeviceDiscoveryExtension.HasValue) _DeviceDiscoveryExtension = GetValue ("DeviceDiscoveryExtension"); return _DeviceDiscoveryExtension.Value; } }
 	public bool HaveDeviceDiscoveryUI { get { if (!_DeviceDiscoveryUI.HasValue) _DeviceDiscoveryUI = GetValue ("DeviceDiscoveryUI"); return _DeviceDiscoveryUI.Value; } }

src/darwin.cs

@@ -0,0 +1,2 @@
+// Darwin isn't really a framework, but to simplify our build logic we treat it as such.
+// This also means this file is needed, even though it's empty, because our build logic will automatically include it in the build.

src/frameworks.sources

@@ -731,6 +731,15 @@ COREWLAN_SOURCES = \
 	CoreWlan/CWInterface.cs \
 	CoreWlan/CWKeychain.cs \
 
+# DARWIN
+
+DARWIN_CORE_SOURCES = \
+	Darwin/TimeSpec.cs \
+
+DARWIN_SOURCES = \
+	Darwin/KernelNotification.cs \
+	Darwin/SystemLog.cs \
+
 # DeviceDiscoveryExtension
 
 DEVICEDISCOVERYEXTENSION_API_SOURCES = \
@@ -2101,6 +2110,7 @@ MACOS_FRAMEWORKS =          \
 	CoreSpotlight           \
 	CoreText                \
 	CoreWlan                \
+	Darwin                  \
 	EventKit                \
 	ExecutionPolicy		\
 	ExtensionKit		\

src/rsp/dotnet/macos-defines-dotnet.rsp

@@ -40,6 +40,7 @@
 -d:HAS_COREVIDEO
 -d:HAS_COREWLAN
 -d:HAS_CRYPTOTOKENKIT
+-d:HAS_DARWIN
 -d:HAS_DEVICECHECK
 -d:HAS_EVENTKIT
 -d:HAS_EXECUTIONPOLICY

src/rsp/macos-defines.rsp

@@ -41,6 +41,7 @@
 -d:HAS_COREVIDEO
 -d:HAS_COREWLAN
 -d:HAS_CRYPTOTOKENKIT
+-d:HAS_DARWIN
 -d:HAS_DEVICECHECK
 -d:HAS_EVENTKIT
 -d:HAS_EXECUTIONPOLICY