Handle clang/gcc defining "unix" during compilation

src/coreclr/vm/datadescriptor/datadescriptor.inc

@@ -951,9 +951,20 @@ CDAC_TYPES_END()
 
 CDAC_GLOBALS_BEGIN()
 
-#if defined(TARGET_UNIX)
+#if defined(TARGET_BROWSER)
+#ifdef browser
+#error Handle 'browser' define
+#endif // browser
+CDAC_GLOBAL_STRING(OperatingSystem, browser)
+#elif defined(TARGET_UNIX)
+#ifdef unix
+#error Handle 'unix' define
+#endif // unix
 CDAC_GLOBAL_STRING(OperatingSystem, unix)
 #elif defined(TARGET_WINDOWS)
+#ifdef windows
+#error Handle 'windows' define
+#endif // windows
 CDAC_GLOBAL_STRING(OperatingSystem, windows)
 #else
 #error TARGET_{OS} define is not recognized by the cDAC. Update this switch and the enum values in IRuntimeInfo.cs

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/IRuntimeInfo.cs

@@ -26,6 +26,7 @@ public enum RuntimeInfoOperatingSystem : uint
     Unknown = 0,
     Windows,
     Unix,
+    Browser,
 }
 
 public interface IRuntimeInfo : IContract

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/StackWalk/Context/AMD64/AMD64Unwinder.cs

@@ -31,7 +31,7 @@ internal class AMD64Unwinder(Target target)
     private readonly Target _target = target;
     private readonly IExecutionManager _eman = target.Contracts.ExecutionManager;
 
-    private readonly bool _unix = target.Contracts.RuntimeInfo.GetTargetOperatingSystem() == RuntimeInfoOperatingSystem.Unix;
+    private readonly bool _unix = target.Contracts.RuntimeInfo.GetTargetOperatingSystem() != RuntimeInfoOperatingSystem.Windows;
 
     public bool Unwind(ref AMD64Context context)
     {

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/StackWalk/Context/X86/X86Unwinder.cs

@@ -34,7 +34,7 @@ public class X86Unwinder(Target target)
     private readonly Target _target = target;
     private readonly uint _pointerSize = (uint)target.PointerSize;
     private readonly bool _updateAllRegs = true;
-    private readonly bool _unixX86ABI = target.Contracts.RuntimeInfo.GetTargetOperatingSystem() == RuntimeInfoOperatingSystem.Unix;
+    private readonly bool _unixX86ABI = target.Contracts.RuntimeInfo.GetTargetOperatingSystem() != RuntimeInfoOperatingSystem.Windows;
 
     private static readonly RegMask[] registerOrder =
     [

src/native/managed/cdac/mscordaccore_universal/Legacy/SOSDacImpl.cs

@@ -589,9 +589,10 @@ int ISOSDacInterface.GetClrWatsonBuckets(ClrDataAddress thread, void* pGenericMo
         byte[] buckets = Array.Empty<byte>();
         try
         {
-            if (_target.Contracts.RuntimeInfo.GetTargetOperatingSystem() == RuntimeInfoOperatingSystem.Unix)
+            if (_target.Contracts.RuntimeInfo.GetTargetOperatingSystem() != RuntimeInfoOperatingSystem.Windows)
                 throw Marshal.GetExceptionForHR(HResults.E_FAIL)!;
-            else if (thread == 0 || pGenericModeBlock == null)
+
+            if (thread == 0 || pGenericModeBlock == null)
                 throw new ArgumentException();
 
             buckets = threadContract.GetWatsonBuckets(thread.ToTargetPointer(_target));