Enable COM in classlibs for win32

The runtime for Windows still has valid implementations for
COM calls. In the case of this bug IsComOjbect needs to behave
correctly.

The intention of this PR is to set DISABLE_COM for only mac
and linux for unity jit and unity apt profiles.

fixes case 1358705

mcs/build/profiles/unityaot.make

@@ -31,7 +31,6 @@ PROFILE_MCS_FLAGS = \
 	-d:UNITY \
 	-d:UNITY_AOT \
 	-d:MOBILE,MOBILE_LEGACY \
-	-d:DISABLE_COM \
 	-d:FULL_AOT_DESKTOP	\
 	-d:FULL_AOT_RUNTIME \
 	$(PLATFORM_FLAGS) \
@@ -46,4 +45,12 @@ NO_INSTALL = yes
 AOT_FRIENDLY_PROFILE = yes
 ALWAYS_AOT_BCL = yes
 MOBILE_PROFILE = yes
-NO_SRE = yes
+NO_SRE = yes
+
+ifeq ($(HOST_PLATFORM),macos)
+PROFILE_MCS_FLAGS += -d:DISABLE_COM
+endif
+
+ifeq ($(HOST_PLATFORM),linux)
+PROFILE_MCS_FLAGS += -d:DISABLE_COM
+endif

mcs/build/profiles/unityjit.make

@@ -11,7 +11,7 @@ profile-check:
 	@:
 
 DEFAULT_REFERENCES = mscorlib
-PROFILE_MCS_FLAGS = -d:NET_4_0 -d:NET_4_5 -d:NET_4_6 -d:MONO -d:UNITY_JIT -d:UNITY -d:WIN_PLATFORM -d:DISABLE_COM -nowarn:1699 -nostdlib $(PLATFORM_DEBUG_FLAGS)
+PROFILE_MCS_FLAGS = -d:NET_4_0 -d:NET_4_5 -d:NET_4_6 -d:MONO -d:UNITY_JIT -d:UNITY -d:WIN_PLATFORM -nowarn:1699 -nostdlib $(PLATFORM_DEBUG_FLAGS)
 API_BIN_PROFILE = v4.7.1
 
 FRAMEWORK_VERSION = 4.5
@@ -20,8 +20,10 @@ XBUILD_VERSION = 4.0
 ifeq ($(HOST_PLATFORM),macos)
 MONO_FEATURE_APPLETLS=1
 ENABLE_GSS=1
+PROFILE_MCS_FLAGS += -d:DISABLE_COM
 endif
 
 ifeq ($(HOST_PLATFORM),linux)
 ENABLE_GSS=1
+PROFILE_MCS_FLAGS += -d:DISABLE_COM
 endif

mcs/class/corlib/System.Runtime.InteropServices/Marshal.cs

@@ -856,7 +856,7 @@ public static object GetUniqueObjectForIUnknown (IntPtr unknown)
 			throw new PlatformNotSupportedException ();
 		}
 
-#if (!MOBILE && !UNITY) || UNITY_AOT
+#if (!MOBILE && !DISABLE_COM) || (UNITY_AOT && !DISABLE_COM)
 		[MethodImplAttribute (MethodImplOptions.InternalCall)]
 		public extern static bool IsComObject (object o);
 #else