Set CMAKE_OSX_DEPLOYMENT_TARGET for all Mono AOT compilers on macOS (#57507)

* Set CMAKE_OSX_DEPLOYMENT_TARGET for all Mono AOT compilers on macOS

Not just if we're targetting iOS/tvOS/macOS since the AOT compiler for WASM or Android can run on macOS too.

Fixes #57431

* Use RealTargetOS if it's available

Author: akoeplinger

src/mono/mono.proj

@@ -532,7 +532,7 @@
   <!-- Build AOT cross compiler (if available) -->
   <Target Name="BuildMonoCross" Condition="'$(BuildMonoAOTCrossCompiler)' == 'true'" DependsOnTargets="BuildMonoRuntime">
 
-    <!-- iOS specific options -->
+    <!-- iOS/tvOS specific options -->
     <PropertyGroup Condition="'$(TargetstvOS)' == 'true' or '$(TargetsiOS)' == 'true'">
       <!-- FIXME: Disable for simulator -->
       <MonoUseCrossTool>true</MonoUseCrossTool>
@@ -546,24 +546,32 @@
       <MonoAotAbi Condition="'$(Platform)' == 'x86'">i386-apple-darwin10</MonoAotAbi>
       <MonoAotAbi Condition="'$(Platform)' == 'x64'">x86_64-apple-darwin10</MonoAotAbi>
     </PropertyGroup>
+
+    <!-- Catalyst specific options -->
     <PropertyGroup Condition="'$(TargetsMacCatalyst)' == 'true'">
       <MonoUseCrossTool>true</MonoUseCrossTool>
       <MonoAotCMakeSysroot Condition="'$(TargetsMacCatalyst)' == 'true'">$(XcodeDir)/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk</MonoAotCMakeSysroot>
       <MonoAotOffsetsFile>$(MonoObjCrossDir)offsets-$(Platform)-darwin.h</MonoAotOffsetsFile>
       <MonoAotAbi Condition="'$(Platform)' == 'arm64'">aarch64-apple-maccatalyst</MonoAotAbi>
       <MonoAotAbi Condition="'$(Platform)' == 'x64'">x86_64-apple-maccatalyst</MonoAotAbi>
     </PropertyGroup>
-    <ItemGroup Condition="'$(TargetstvOS)' == 'true' or '$(TargetsiOS)' == 'true' or '$(TargetsMacCatalyst)' == 'true'">
-      <MonoAOTCMakeArgs Include="-DCMAKE_OSX_DEPLOYMENT_TARGET=$(macOSVersionMin)" />
-    </ItemGroup>
 
+    <!-- Linux specific options -->
+    <ItemGroup Condition="'$(RealTargetOS)' == 'Linux' or $([MSBuild]::IsOSPlatform('Linux'))">
+      <_LibClang Include="$(ANDROID_NDK_ROOT)/toolchains/llvm/prebuilt/$(MonoToolchainPrebuiltOS)/lib64/libclang.so.*"/>
+    </ItemGroup>
     <PropertyGroup Condition="'$(TargetOS)' == 'Linux' and '$(Platform)' == 'arm64'">
       <MonoUseCrossTool>true</MonoUseCrossTool>
       <MonoAotAbi>aarch64-linux-gnu</MonoAotAbi>
       <MonoAotOffsetsFile>$(MonoObjCrossDir)offsets-aarch-linux-gnu.h</MonoAotOffsetsFile>
       <MonoAotOffsetsPrefix>$(MonoCrossDir)/usr/lib/gcc/aarch64-linux-gnu/5</MonoAotOffsetsPrefix>
     </PropertyGroup>
 
+    <!-- macOS host specific options -->
+    <ItemGroup Condition="'$(RealTargetOS)' == 'OSX' or $([MSBuild]::IsOSPlatform('OSX'))">
+      <MonoAOTCMakeArgs Include="-DCMAKE_OSX_DEPLOYMENT_TARGET=$(macOSVersionMin)" />
+    </ItemGroup>
+
     <!-- WASM specific options -->
     <PropertyGroup Condition="'$(TargetsBrowser)' == 'true'">
       <MonoUseCrossTool>true</MonoUseCrossTool>
@@ -577,7 +585,7 @@
     </PropertyGroup>
 
     <!-- Windows specific options -->
-    <ItemGroup Condition="$([MSBuild]::IsOSPlatform('Windows'))">
+    <ItemGroup Condition="'$(RealTargetOS)' == 'Windows' or $([MSBuild]::IsOSPlatform('Windows'))">
       <_MonoAOTCPPFLAGS Include="-DHOST_WIN32" />
       <_MonoAOTCPPFLAGS Include="-D__WIN32__" />
       <_MonoAOTCPPFLAGS Include="-DWIN32" />
@@ -624,10 +632,6 @@
       <MonoAotOffsetsFile>$(MonoObjDir)cross/offsets-$(Platform)-android.h</MonoAotOffsetsFile>
     </PropertyGroup>
 
-    <ItemGroup Condition="$([MSBuild]::IsOSPlatform('Linux'))">
-      <_LibClang Include="$(ANDROID_NDK_ROOT)/toolchains/llvm/prebuilt/$(MonoToolchainPrebuiltOS)/lib64/libclang.so.*"/>
-    </ItemGroup>
-
     <PropertyGroup>
       <MonoLibClang Condition="$([MSBuild]::IsOSPlatform('OSX')) and '$(MonoLibClang)' == ''">$(XcodeDir)/Toolchains/XcodeDefault.xctoolchain/usr/lib/libclang.dylib</MonoLibClang>
       <MonoLibClang Condition="$([MSBuild]::IsOSPlatform('Linux')) and '$(MonoLibClang)' == ''">@(_LibClang)</MonoLibClang>