Fix Vc link directory when external

CMakeLists.txt

@@ -336,28 +336,29 @@ else()
   # try to find an external Vc
   find_package(Vc 1.0)
   if(Vc_FOUND)
-    message(STATUS "External Vc => 1.0 FOUND")
-    # define a convenience macro
+    message(STATUS "External Vc version ${Vc_VERSION} (>= 1.0) found")
+    # Redefinition of a macro originally under the Vc/ directory which we don't include
     macro(ALICE_UseVc)
       include_directories(SYSTEM "${Vc_INCLUDE_DIR}")
       add_definitions(${Vc_DEFINITIONS})
       string(REPLACE ";" " " TMP_CMAKE_CXX_VC_FLAGS "${Vc_COMPILE_FLAGS} ${Vc_ARCHITECTURE_FLAGS}")
       set(CMAKE_CXX_FLAGS "${TMPCMAKE_CXX_VC_FLAGS} ${CMAKE_CXX_FLAGS}")
     endmacro()
+    link_directories(${Vc_LIB_DIR})
   else()
-    message(STATUS "External Vc => 1.0 NOT FOUND; looking for Vc 0.7 ...")
-    # we could try to see if find_packagge(Vc 0.7 IS OK)
+    message(WARNING "External Vc >= 1.0 not found: falling back on Vc >= 0.7")
     find_package(Vc 0.7)
     if (Vc_FOUND)
-      message(STATUS "External Vc => 0.7 FOUND")
+      message(STATUS "External Vc version ${Vc_VERSION} (>= 0.7) found")
       # put here the macros suitable for Vc version 0.7
       macro(ALICE_UseVc)
        include_directories(SYSTEM "${Vc_INCLUDE_DIR}")
        add_definitions(${Vc_DEFINITIONS})
       endmacro()
+      link_directories(${Vc_LIB_DIR})
     else()
       # finally we fallback to the deprecated internal Vc
-      message(WARNING "You are using the internal Vc installation: support for this is deprecated and it will be removed soon")
+      message(WARNING "You are using AliRoot's builtin Vc: this is deprecated and it will be dropped soon")
       # Include Vc own cmake
       include(Vc/Vc.cmake)
       if(NOT ROOT_HASVC)