Merge branch 'nd/tag-version-sort'

Allow v1.9.0 sorted before v1.10.0 in "git tag --list" output.

* nd/tag-version-sort:
  tag: support --sort=<spec>

1 files changed, 2 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index b66cb49..107ac61 100644
--- a/cache.h
+++ b/cache.h
@@ -1458,4 +1458,6 @@ int stat_validity_check(struct stat_validity *sv, const char *path);
  */
 void stat_validity_update(struct stat_validity *sv, int fd);
 
+int versioncmp(const char *s1, const char *s2);
+
 #endif /* CACHE_H */