Add a note to the count_lines.sh script.

diff --git a/contrib/utilities/count_lines.sh b/contrib/utilities/count_lines.sh
index 61640aaa73bb2fef5dd0dc4cfbbfbf9b0ec4f62b..f449c7607707d6db17ddae7d5527f2f945f723bf 100755 (executable)
--- a/contrib/utilities/count_lines.sh
+++ b/contrib/utilities/count_lines.sh
@@ -38,6 +38,14 @@
 #       copy you are working in, where it will be an untracked file that
 #       git leaves alone as it cycles through repository commits.
 #
+# NOTE: Separately, since the script requires git to check out many
+#       different versions, all of which have files that may not exist
+#       in the current tip of the git repository you have on your hard
+#       drive, or have files that have changed over time, it is going
+#       to lead to certain heartbreak if you run this script in a directory
+#       that has anything other than a pristine clone of the current git
+#       repository. Do not run it in directory in which you do or have
+#       done development work.
 #
 # The output of this file consists of three numbers per line, showing
 #   date source-lines test-lines