BUG: Propagate platform settings such as CMAKE_OSX_ARCHITECTURES to the try compile

Modules/Platform/Darwin.cmake

@@ -97,3 +97,8 @@ SET(CMAKE_SYSTEM_APPBUNDLE_PATH
 INCLUDE(Platform/UnixPaths)
 SET(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_SYSTEM_INCLUDE_PATH} /sw/include)
 SET(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_SYSTEM_LIBRARY_PATH} /sw/lib)
+
+IF(CMAKE_OSX_ARCHITECTURES)
+  SET(CMAKE_TRY_COMPILE_PLATFORM_OPTIONS "${CMAKE_TRY_COMPILE_PLATFORM_OPTIONS}
+    SET(CMAKE_OSX_ARCHITECTURES \"${CMAKE_OSX_ARCHITECTURES}\")")
+ENDIF(CMAKE_OSX_ARCHITECTURES)

Source/cmTryCompileCommand.cxx

@@ -204,6 +204,11 @@ int cmTryCompileCommand::CoreTryCompileCode(
         }
       fprintf(fout, ")\n");
       }
+    const char* platformOptions = mf->GetDefinition("CMAKE_TRY_COMPILE_PLATFORM_OPTIONS");
+    if ( platformOptions )
+      {
+      fprintf(fout, "%s\n", platformOptions);
+      }
     
     fprintf(fout, "ADD_EXECUTABLE(cmTryCompileExec \"%s\")\n",source.c_str());
     fprintf(fout,