We reworked all its users to use the functionality through
diff_tree_sha1 variant in recent patches (see "tree-diff: allow
diff_tree_sha1 to accept NULL sha1" and what comes next).

diff_tree() is now not used outside tree-diff.c - make it static.

Signed-off-by: Kirill Smelkov <k...@mns.spb.ru>
---

 ( new patch )

 diff.h      | 2 --
 tree-diff.c | 4 ++--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/diff.h b/diff.h
index e79f3b3..5d7b9f7 100644
--- a/diff.h
+++ b/diff.h
@@ -189,8 +189,6 @@ const char *diff_line_prefix(struct diff_options *);
 
 extern const char mime_boundary_leader[];
 
-extern int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
-                    const char *base, struct diff_options *opt);
 extern int diff_tree_sha1(const unsigned char *old, const unsigned char *new,
                          const char *base, struct diff_options *opt);
 extern int diff_root_tree_sha1(const unsigned char *new, const char *base,
diff --git a/tree-diff.c b/tree-diff.c
index 2fd6d0e..b99622c 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -137,8 +137,8 @@ static void skip_uninteresting(struct tree_desc *t, struct 
strbuf *base,
        }
 }
 
-int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
-             const char *base_str, struct diff_options *opt)
+static int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
+                    const char *base_str, struct diff_options *opt)
 {
        struct strbuf base;
        int baselen = strlen(base_str);
-- 
1.9.rc1.181.g641f458

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