Makefile: Set compiler switch for USE_NSEC

diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index fed6de6a7fa0e720994f7094be2f464818af289a..451950bab67702a236c55e77d6f3a0723a812488 100644 (file)
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -122,6 +122,10 @@ You can use the 'map' convenience function in this filter, and other
 convenience functions, too.  For example, calling 'skip_commit "$@"'
 will leave out the current commit (but not its changes! If you want
 that, use 'git-rebase' instead).
++
+You can also use the 'git_commit_non_empty_tree "$@"' instead of
+'git commit-tree "$@"' if you don't wish to keep commits with a single parent
+and that makes no change to the tree.
 
 --tag-name-filter <command>::
        This is the filter for rewriting tag names. When passed,
@@ -151,6 +155,16 @@ to other tags will be rewritten to point to the underlying commit.
        The result will contain that directory (and only that) as its
        project root.
 
+--prune-empty::
+       Some kind of filters will generate empty commits, that left the tree
+       untouched.  This switch allow git-filter-branch to ignore such
+       commits.  Though, this switch only applies for commits that have one
+       and only one parent, it will hence keep merges points. Also, this
+       option is not compatible with the use of '--commit-filter'. Though you
+       just need to use the function 'git_commit_non_empty_tree "$@"' instead
+       of the 'git commit-tree "$@"' idiom in your commit filter to make that
+       happen.
+
 --original <namespace>::
        Use this option to set the namespace where the original commits
        will be stored. The default value is 'refs/original'.