get rid of obsolete _clhep_verify_cxx0x macro

cmake/Modules/ClhepVariables.cmake

@@ -86,25 +86,6 @@ macro( clhep_autoconf_variables )
 
 endmacro( clhep_autoconf_variables )
 
-macro( _clhep_verify_cxx0x )
-  message( FATAL_ERROR "The c++0x extension is no longer supported.  Please use c++11 or later.")
-  if( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" )
-    if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 2.9 )
-      message( FATAL_ERROR "c++0x extension is not available for ${CMAKE_CXX_COMPILER_ID}${CMAKE_CXX_COMPILER_VERSION}")
-    else()
-      set( HAVE_STDCXX true )
-    endif()
-  elseif(CMAKE_COMPILER_IS_GNUCXX)
-    if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.3 )
-      message( FATAL_ERROR "c++0x extension is not available for ${CMAKE_CXX_COMPILER}")
-    else()
-      set( HAVE_STDCXX true )
-    endif()
-  else()
-    message(STATUS "clhep_set_compiler_flags: Do not know how to set c++11 extensions for ${CMAKE_CXX_COMPILER_ID}")
-  endif()
-endmacro( _clhep_verify_cxx0x )
-
 macro( _clhep_verify_cxx11 )
   if( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" )
     if( CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.3 )
@@ -162,7 +143,7 @@ macro( _clhep_verify_cxx14 )
     endif()
   elseif( ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel" )
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 16.0)
-      message( FATAL_ERROR "c++11 extension is not available for ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}")
+      message( FATAL_ERROR "c++14 extension is not available for ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}")
     else()
       set( HAVE_STDCXX true )
     endif()
@@ -224,7 +205,7 @@ macro( _clhep_check_for_pthread )
     FOREACH(flag ${flag_list})    
        #message(STATUS "_clhep_check_for_pthread debug: found flag ${flag}" )
        if( ${flag} STREQUAL "-std=c++0x" )
-         _clhep_verify_cxx0x( )
+	 message( FATAL_ERROR "CLHEP must be built with c++11 or later enabled")
        elseif( ${flag} STREQUAL "-std=c++11" )
          _clhep_verify_cxx11()
        elseif( ${flag} STREQUAL "-std=c++1y" )