index-pack: work around thread-unsafe pread()

diff --git a/t/t4004-diff-rename-symlink.sh b/t/t4004-diff-rename-symlink.sh
index 92a65f4852b8eca089fb9de617e0cdc8b55e1475..6e562c80d12f9f58353c8f6444c0d7a0737dbae4 100755 (executable)
--- a/t/t4004-diff-rename-symlink.sh
+++ b/t/t4004-diff-rename-symlink.sh
@@ -35,7 +35,7 @@ test_expect_success SYMLINKS \
 # a new creation.
 
 test_expect_success SYMLINKS 'setup diff output' "
-    GIT_DIFF_OPTS=--unified=0 git diff-index -M -p $tree >current &&
+    GIT_DIFF_OPTS=--unified=0 git diff-index -C -p $tree >current &&
     cat >expected <<\EOF
 diff --git a/bozbar b/bozbar
 new file mode 120000