Refactor VTK_ADD_EXECUTABLE macro to build forwarding executables.

Only if VTK_BUILD_FORWARDING_EXECUTABLES is ON.

Change-Id: Ie21825f6b44a8dc7a4767de941c2ae025f31446b

CMake/vtkTargetExportMacros.cmake

@@ -3,11 +3,16 @@ if(NOT VTK_INSTALL_EXPORT_NAME)
 endif()
 
 MACRO(VTK_ADD_LIBRARY name)
-  ADD_LIBRARY(${name} ${ARGN})
-  SET_PROPERTY(GLOBAL APPEND PROPERTY VTK_TARGETS ${name})
+  add_library(${name} ${ARGN})
+  set_property(GLOBAL APPEND PROPERTY VTK_TARGETS ${name})
 ENDMACRO(VTK_ADD_LIBRARY)
 
 MACRO(VTK_ADD_EXECUTABLE name)
-  ADD_EXECUTABLE(${name} ${ARGN})
-  SET_PROPERTY(GLOBAL APPEND PROPERTY VTK_TARGETS ${name})
+  if(UNIX AND VTK_BUILD_FORWARDING_EXECUTABLES)
+    add_executable_with_forwarding(VTK_EXE_SUFFIX ${name} ${ARGN})
+    set_property(GLOBAL APPEND PROPERTY VTK_TARGETS ${name})
+  else()
+    add_executable(${name} ${ARGN})
+    set_property(GLOBAL APPEND PROPERTY VTK_TARGETS ${name})
+  endif()
 ENDMACRO(VTK_ADD_EXECUTABLE)