1 files changed, 5 insertions, 0 deletions
diff --git a/lib/PublicInbox/ExtSearchIdx.pm b/lib/PublicInbox/ExtSearchIdx.pm
index bfe39891..050c4252 100644
--- a/lib/PublicInbox/ExtSearchIdx.pm
+++ b/lib/PublicInbox/ExtSearchIdx.pm
@@ -296,6 +296,11 @@ sub eidx_sync { # main entry point
          $self->idx_init($opt); # acquire lock via V2Writable::_idx_init
          $self->{oidx}->rethread_prepare($opt);
  
+        my $warn_cb = $SIG{__WARN__} || sub { print STDERR @_ };
+        local $self->{current_info} = '';
+        local $SIG{__WARN__} = sub {
+                $warn_cb->($self->{current_info}, ': ', @_);
+        };
          _sync_inbox($self, $opt, $_) for (@{$self->{ibx_list}});
  
          $self->{oidx}->rethread_done($opt);