From e7dbccbdcd76286d8b7a73680eac01553703c488 Mon Sep 17 00:00:00 2001
From: Yaniv Michael Kaul <yaniv.kaul@scylladb.com>
Date: Fri, 17 Apr 2026 11:45:09 +0300
Subject: [PATCH] replica/logstor: declare hist_key specialization before use

Declare the hist_key<segment_descriptor> specialization in compaction.hh
before templates in that header can instantiate the primary template.

This avoids conflicting primary-template instantiations when the header is
seen through the PCH.
---
 replica/logstor/compaction.hh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/replica/logstor/compaction.hh b/replica/logstor/compaction.hh
index a3884c6e46..539c0f5228 100644
--- a/replica/logstor/compaction.hh
+++ b/replica/logstor/compaction.hh
@@ -69,6 +69,13 @@ struct segment_descriptor : public log_heap_hook<segment_descriptor_hist_options
     }
 };
 
+} // namespace replica::logstor
+
+template<>
+size_t hist_key<replica::logstor::segment_descriptor>(const replica::logstor::segment_descriptor& desc);
+
+namespace replica::logstor {
+
 using segment_descriptor_hist = log_heap<segment_descriptor, segment_descriptor_hist_options>;
 
 struct segment_set {