From 721dace0c5882c7c70ff3ea55fe0cb8aabd9553e Mon Sep 17 00:00:00 2001
From: alemuntoni <muntoni.alessandro@gmail.com>
Date: Thu, 17 Jun 2021 12:49:42 +0200
Subject: [PATCH] update cmake to be sure vcg is included just one time

---
 CMakeLists.txt | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 663c74cf..acc67cd0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -279,14 +279,18 @@ set(SOURCES
 )
 
 if (VCG_HEADER_ONLY)
-	add_library(vcglib INTERFACE)
-	target_include_directories(
-		vcglib INTERFACE
-		${CMAKE_CURRENT_LIST_DIR}
-		${EIGEN_INCLUDE_DIRS})
+	if (NOT TARGET vcglib) # to be sure that vcglib target is created just one time
+		add_library(vcglib INTERFACE)
+		target_include_directories(
+			vcglib INTERFACE
+			${CMAKE_CURRENT_LIST_DIR}
+			${EIGEN_INCLUDE_DIRS})
 
-	#just to show headers in ide
-	add_custom_target(vcglib_ide SOURCES ${VCG_HEADERS})
+		#just to show headers in ide
+		add_custom_target(vcglib_ide SOURCES ${VCG_HEADERS})
+	else()
+		message(STATUS "- VCGLib - jumped - already included")
+	endif()
 else()
 	#TODO make vcglib that includes all the wrap sources, checking everytime
 	# if the the required targets (e.g. qt, gl, glew...) exists