[Nathan Bossart <nathandbossart@gmail.com>]

My compiler has the following complaint:

../postgresql/src/backend/postmaster/walsummarizer.c: In function ‘GetOldestUnsummarizedLSN’:
../postgresql/src/backend/postmaster/walsummarizer.c:540:32: error: ‘unsummarized_lsn’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  540 |  WalSummarizerCtl->pending_lsn = unsummarized_lsn;
      |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~

I haven't looked closely to see whether there is actually a problem here,
but the attached patch at least resolves the warning.

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com

Attachments:

fix_uninitialized_warning.patch (text/x-diff, 577B) download
diff --git a/src/backend/postmaster/walsummarizer.c b/src/backend/postmaster/walsummarizer.c
index 9b5d3cdeb0..0cf6bbe59d 100644
--- a/src/backend/postmaster/walsummarizer.c
+++ b/src/backend/postmaster/walsummarizer.c
@@ -438,7 +438,7 @@ GetOldestUnsummarizedLSN(TimeLineID *tli, bool *lsn_is_exact,
 	LWLockMode	mode = reset_pending_lsn ? LW_EXCLUSIVE : LW_SHARED;
 	int			n;
 	List	   *tles;
-	XLogRecPtr	unsummarized_lsn;
+	XLogRecPtr	unsummarized_lsn = InvalidXLogRecPtr;
 	TimeLineID	unsummarized_tli = 0;
 	bool		should_make_exact = false;
 	List	   *existing_summaries;