updated apple-clang flags in compiler. Fix to missing symbols from stl.

moose-core/CheckCXXCompiler.cmake

@@ -5,8 +5,6 @@ CHECK_CXX_COMPILER_FLAG( "-std=c++11" COMPILER_SUPPORTS_CXX11 )
 CHECK_CXX_COMPILER_FLAG( "-std=c++0x" COMPILER_SUPPORTS_CXX0X )
 CHECK_CXX_COMPILER_FLAG( "-Wno-strict-aliasing" COMPILER_WARNS_STRICT_ALIASING )
 
-
-
 # Turn warning to error: Not all of the options may be supported on all
 # versions of compilers. be careful here.
 add_definitions(-Wall
@@ -32,11 +30,17 @@ if(COMPILER_SUPPORTS_CXX11)
     message(STATUS "Your compiler supports c++11 features. Enabling it")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
     add_definitions( -DENABLE_CPP11 )
+    if(APPLE)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++11" )
+    endif(APPLE)
 elseif(COMPILER_SUPPORTS_CXX0X)
     message(STATUS "Your compiler supports c++0x features. Enabling it")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
     add_definitions( -DENABLE_CXX11 )
     add_definitions( -DBOOST_NO_CXX11_SCOPED_ENUMS -DBOOST_NO_SCOPED_ENUMS )
+    if(APPLE)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++11" )
+    endif(APPLE)
 else()
     add_definitions( -DBOOST_NO_CXX11_SCOPED_ENUMS -DBOOST_NO_SCOPED_ENUMS )
     message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support.")