[net8.0] [src] Add the RequiresPreviewFeatures attribute if we're usi…

…ng an unstable version of Xcode. Contributes towards #18343. (#18488)

Android does the same.

Contributes towards #18343.

src/AssemblyInfo.cs.in

@@ -38,3 +38,7 @@ using System.Runtime.CompilerServices;
 // in order to compile stuff, we erase the third and fourth number and only use 0 for both.
 [assembly: AssemblyVersion ("@NUGET_VERSION_MAJOR@.@NUGET_VERSION_MINOR@.0.0")]
 #endif
+
+#if NET && !XCODE_IS_STABLE && !COREBUILD
+[assembly: RequiresPreviewFeatures("These are preview bindings for an unstable version of Xcode. Opt into preview features by adding <EnablePreviewFeatures>True</EnablePreviewFeatures> to your project file.")]
+#endif

src/Makefile

@@ -86,6 +86,10 @@ DOTNET_REFERENCES = \
 DOTNET_OR_GREATER_DEFINES:=$(foreach version,$(shell seq 6 $(firstword $(subst ., ,$(subst net,,$(DOTNET_TFM))))),/define:NET$(version)_0_OR_GREATER)
 DOTNET_FLAGS=/noconfig /nostdlib+ /deterministic /features:strict /nologo /target:library /debug /unsafe /define:NET /define:NET_TODO /define:XAMCORE_3_0 $(DOTNET_OR_GREATER_DEFINES) $(DOTNET_REFERENCES)
 
+ifeq ($(XCODE_IS_STABLE),true)
+DOTNET_FLAGS+=/define:XCODE_IS_STABLE
+endif
+
 DOTNET_COMPILER=$(DOTNET_BUILD_DIR)/compiler
 DOTNET_GENERATOR_FLAGS=$(GENERATOR_FLAGS) -compiler=$(abspath $(DOTNET_COMPILER)) --lib=$(DOTNET_BCL_DIR) -attributelib:$(DOTNET_BINDING_ATTRIBUTES) $(DOTNET_REFERENCES)
 DOTNET_GENERATOR=$(DOTNET_BUILD_DIR)/bgen/bgen