From fc65f913c1ef988ab808131fcf94571ef0684891 Mon Sep 17 00:00:00 2001
From: Matej Kenda <matejken@gmail.com>
Date: Sat, 13 Jan 2024 17:10:38 +0100
Subject: [PATCH] fix(JSON): explicitly instantiate and export SharedPtr for
 JSON::Array and JSON::Object (-fvisibility=hidden) (#4393, #3331)

---
 JSON/include/Poco/JSON/Array.h  | 9 +++++++++
 JSON/include/Poco/JSON/Object.h | 9 +++++++++
 JSON/src/Array.cpp              | 4 ++++
 JSON/src/Object.cpp             | 5 +++++
 4 files changed, 27 insertions(+)

diff --git a/JSON/include/Poco/JSON/Array.h b/JSON/include/Poco/JSON/Array.h
index 631160de61..68c8d55e13 100644
--- a/JSON/include/Poco/JSON/Array.h
+++ b/JSON/include/Poco/JSON/Array.h
@@ -26,8 +26,17 @@
 
 
 namespace Poco {
+
 namespace JSON {
 
+class JSON_API Array;
+
+}
+
+// Explicitly instantiated shared pointer in JSON library
+extern template class JSON_API Poco::SharedPtr<Poco::JSON::Array>;
+
+namespace JSON {
 
 class Object;
 
diff --git a/JSON/include/Poco/JSON/Object.h b/JSON/include/Poco/JSON/Object.h
index e7eae62495..502ce6f236 100644
--- a/JSON/include/Poco/JSON/Object.h
+++ b/JSON/include/Poco/JSON/Object.h
@@ -34,8 +34,17 @@
 
 
 namespace Poco {
+
 namespace JSON {
 
+class JSON_API Object;
+
+}
+
+// Explicitly instatiated shared pointer in JSON library
+extern template class JSON_API Poco::SharedPtr<Poco::JSON::Object>;
+
+namespace JSON {
 
 class JSON_API Object
 	/// Represents a JSON object. Object provides a representation based on
diff --git a/JSON/src/Array.cpp b/JSON/src/Array.cpp
index 05f40503f6..5179c84222 100644
--- a/JSON/src/Array.cpp
+++ b/JSON/src/Array.cpp
@@ -20,6 +20,10 @@
 
 using Poco::Dynamic::Var;
 
+// Explicitly instatiated shared pointer in JSON library is required to
+// have known instance of the pointer to be used with VarHolder when
+// compiling with -fvisibility=hidden
+template class Poco::SharedPtr<Poco::JSON::Array>;
 
 namespace Poco {
 namespace JSON {
diff --git a/JSON/src/Object.cpp b/JSON/src/Object.cpp
index 36c23e61f1..036f602ce8 100644
--- a/JSON/src/Object.cpp
+++ b/JSON/src/Object.cpp
@@ -19,8 +19,13 @@
 
 using Poco::Dynamic::Var;
 
+// Explicitly instatiated shared pointer in JSON library is required to
+// have known instance of the pointer to be used with VarHolder when
+// compiling with -fvisibility=hidden
+template class Poco::SharedPtr<Poco::JSON::Object>;
 
 namespace Poco {
+
 namespace JSON {