BUG: fix c++11 requirement, check must be done after enablement/disablement routines

CMake/OTBModuleEnablement.cmake

@@ -169,6 +169,11 @@ set(OTB_MODULES_ENABLED "")
 set(OTB_MODULES_DISABLED "")
 foreach(otb-module ${OTB_MODULES_ALL})
   if(${otb-module}_ENABLED)
+    # check cxx11 requirement after all enable/disable macros have been passed
+    if(OTB_MODULE_${otb-module}_REQUIRES_CXX11 AND NOT OTB_HAS_CXX11)
+      message(FATAL_ERROR "Module ${otb-module} requires C++11 support. Consider adding --std=c++11 to your compiler flags or disabling it.")
+    endif()
+
     list(APPEND OTB_MODULES_ENABLED ${otb-module})
 
     # We will sort modules according to their dependency graph,

CMake/OTBModuleMacros.cmake

@@ -336,7 +336,5 @@ macro(otb_module_target _name)
 endmacro()
 
 macro(otb_module_requires_cxx11)
-  if(${otb-module}_ENABLED AND NOT ${OTB_HAS_CXX11})
-    message(FATAL_ERROR "Module ${otb-module} requires C++11 support. Consider adding --std=c++11 to your compiler flags or disabling it.")
-  endif()  
+  set(OTB_MODULE_${otb-module}_REQUIRES_CXX11 1)
 endmacro()