From f2a15f4abf09004f752e9908b20c933b61d273c9 Mon Sep 17 00:00:00 2001
From: Florian Kauer <koalo@koalo.de>
Date: Mon, 19 Jul 2021 09:00:07 +0200
Subject: [PATCH] avoid adding Paho MQTT C library twice

Signed-off-by: Florian Kauer <koalo@koalo.de>
---
 cmake/FindPahoMqttC.cmake | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cmake/FindPahoMqttC.cmake b/cmake/FindPahoMqttC.cmake
index b3e7ec39..b2fc066e 100644
--- a/cmake/FindPahoMqttC.cmake
+++ b/cmake/FindPahoMqttC.cmake
@@ -17,7 +17,9 @@ find_library(PAHO_MQTT_C_LIBRARIES NAMES ${_PAHO_MQTT_C_LIB_NAME})
 unset(_PAHO_MQTT_C_LIB_NAME)
 find_path(PAHO_MQTT_C_INCLUDE_DIRS NAMES MQTTAsync.h)
 
-add_library(PahoMqttC::PahoMqttC UNKNOWN IMPORTED)
+if (NOT TARGET PahoMqttC::PahoMqttC)
+    add_library(PahoMqttC::PahoMqttC UNKNOWN IMPORTED)
+endif ()
 
 set_target_properties(PahoMqttC::PahoMqttC PROPERTIES
     IMPORTED_LOCATION "${PAHO_MQTT_C_LIBRARIES}"