[CMake] Removing duplicates from the list of test suites to generate targets for.

Not doing this causes some headaches for users migrating from autoconf to CMake.

llvm-svn: 233428

cmake/modules/AddLLVM.cmake

@@ -803,8 +803,13 @@ function(add_lit_testsuites project directory)
   if (NOT CMAKE_CONFIGURATION_TYPES)
     parse_arguments(ARG "PARAMS;DEPENDS;ARGS" "" ${ARGN})
     file(GLOB_RECURSE litCfg ${directory}/lit*.cfg)
+    set(lit_suites)
     foreach(f ${litCfg})
       get_filename_component(dir ${f} DIRECTORY)
+      set(lit_suites ${lit_suites} ${dir})
+    endforeach()
+    list(REMOVE_DUPLICATES lit_suites)
+    foreach(dir ${lit_suites})
       string(REPLACE ${directory} "" name_slash ${dir})
       if (name_slash)
         string(REPLACE "/" "-" name_slash ${name_slash})