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-rw-r--r--read-cache.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/read-cache.c b/read-cache.c
index aa848e170f..b1027f7ee0 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2070,7 +2070,8 @@ int write_locked_index(struct index_state *istate, struct lock_file *lock,
{
struct split_index *si = istate->split_index;
- if (!si || (istate->cache_changed & ~EXTMASK)) {
+ if (!si || alternate_index_output ||
+ (istate->cache_changed & ~EXTMASK)) {
if (si)
hashclr(si->base_sha1);
return do_write_locked_index(istate, lock, flags);