From 09a5b9c25011b6976813130239994661ab1b0d66 Mon Sep 17 00:00:00 2001
From: Thomas Vanbesien <tvanbesi@proton.me>
Date: Thu, 19 Feb 2026 23:07:58 +0100
Subject: Fix open62541 backend plugin failing to load at runtime

The QtOpcUa backend plugin has $ORIGIN-relative RUNPATH resolving to
qtopcua-install/lib/, but libopen62541.so lives in a separate install
prefix. Symlink the open62541 libs into the QtOpcUa lib dir so dlopen
can find them.
---
 cmake/BuildDeps.cmake | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/cmake/BuildDeps.cmake b/cmake/BuildDeps.cmake
index 1b8eae3..890da57 100644
--- a/cmake/BuildDeps.cmake
+++ b/cmake/BuildDeps.cmake
@@ -119,3 +119,13 @@ if(NOT EXISTS "${QTOPCUA_INSTALL_DIR}/lib/libQt6OpcUa.so")
 else()
   message(STATUS "qtopcua already built, skipping")
 endif()
+
+# The QtOpcUa backend plugin uses $ORIGIN-relative RUNPATH that resolves to
+# qtopcua-install/lib/. Symlink the open62541 libs there so dlopen finds them.
+file(GLOB _open62541_libs "${OPEN62541_INSTALL_DIR}/lib/libopen62541*")
+foreach(_lib ${_open62541_libs})
+  get_filename_component(_name ${_lib} NAME)
+  if(NOT EXISTS "${QTOPCUA_INSTALL_DIR}/lib/${_name}")
+    file(CREATE_LINK ${_lib} "${QTOPCUA_INSTALL_DIR}/lib/${_name}" SYMBOLIC)
+  endif()
+endforeach()
-- 
cgit v1.2.3