From ad056d5d0078e889cecf8fadaf0287a168c507a0 Mon Sep 17 00:00:00 2001
From: Thomas Psota <thomas.psota@iese.fraunhofer.de>
Date: Wed, 8 Mar 2023 14:49:51 +0100
Subject: [PATCH] Fix double declared nlomann_json target when used in external
 projects through add_subdirectory

---
 lib/nlohmann_json/CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/nlohmann_json/CMakeLists.txt b/lib/nlohmann_json/CMakeLists.txt
index cd30eaff..a12489a9 100644
--- a/lib/nlohmann_json/CMakeLists.txt
+++ b/lib/nlohmann_json/CMakeLists.txt
@@ -4,7 +4,11 @@
 
 project(nlohmann_json VERSION 3.11.2)
 
+if(NOT TARGET nlohmann_json)
+
 add_library(${PROJECT_NAME} INTERFACE)
 target_include_directories(${PROJECT_NAME} INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}/include")
 
-add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
\ No newline at end of file
+add_library(${PROJECT_NAME}::${PROJECT_NAME} ALIAS ${PROJECT_NAME})
+
+endif()
\ No newline at end of file