Index: llvm/utils/benchmark/cmake/GetGitVersion.cmake
===================================================================
--- llvm/utils/benchmark/cmake/GetGitVersion.cmake
+++ llvm/utils/benchmark/cmake/GetGitVersion.cmake
@@ -20,7 +20,7 @@
 
 function(get_git_version var)
   if(GIT_EXECUTABLE)
-      execute_process(COMMAND ${GIT_EXECUTABLE} describe --match "v[0-9]*.[0-9]*.[0-9]*" --abbrev=8
+      execute_process(COMMAND ${GIT_EXECUTABLE} describe --match "v[0-9]*.[0-9]*.[0-9]*" --abbrev=8 --dirty
           WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
           RESULT_VARIABLE status
           OUTPUT_VARIABLE GIT_VERSION
@@ -31,20 +31,6 @@
           string(STRIP ${GIT_VERSION} GIT_VERSION)
           string(REGEX REPLACE "-[0-9]+-g" "-" GIT_VERSION ${GIT_VERSION})
       endif()
-
-      # Work out if the repository is dirty
-      execute_process(COMMAND ${GIT_EXECUTABLE} update-index -q --refresh
-          WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-          OUTPUT_QUIET
-          ERROR_QUIET)
-      execute_process(COMMAND ${GIT_EXECUTABLE} diff-index --name-only HEAD --
-          WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-          OUTPUT_VARIABLE GIT_DIFF_INDEX
-          ERROR_QUIET)
-      string(COMPARE NOTEQUAL "${GIT_DIFF_INDEX}" "" GIT_DIRTY)
-      if (${GIT_DIRTY})
-          set(GIT_VERSION "${GIT_VERSION}-dirty")
-      endif()
   else()
       set(GIT_VERSION "v0.0.0")
   endif()