From 7879d179ecadfa14d65a1d68c40b327a18783404 Mon Sep 17 00:00:00 2001
From: Silvio Traversaro <silvio@traversaro.it>
Date: Wed, 17 Jul 2024 11:10:47 +0200
Subject: [PATCH] Ensure that find_package(zenohc) can be called two times
 (#470)

---
 install/PackageConfig.cmake.in | 43 ++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 20 deletions(-)

diff --git a/install/PackageConfig.cmake.in b/install/PackageConfig.cmake.in
index e803d012f..b832e1ed7 100644
--- a/install/PackageConfig.cmake.in
+++ b/install/PackageConfig.cmake.in
@@ -25,32 +25,35 @@ if(_IMPORT_PREFIX STREQUAL "/")
   set(_IMPORT_PREFIX "")
 endif()
 
-add_library(__zenohc_static STATIC IMPORTED GLOBAL)
-message(STATUS "ZENOHC_BUILD_WITH_UNSTABLE_API=${ZENOHC_BUILD_WITH_UNSTABLE_API}")
-message(STATUS "ZENOHC_BUILD_WITH_SHARED_MEMORY=${ZENOHC_BUILD_WITH_SHARED_MEMORY}")
-
-add_library(zenohc::static ALIAS __zenohc_static)
-target_link_libraries(__zenohc_static INTERFACE @NATIVE_STATIC_LIBS@)
-set_target_properties(__zenohc_static PROPERTIES
-    IMPORTED_LOCATION "${_IMPORT_PREFIX}/@CMAKE_INSTALL_LIBDIR@/@STATICLIB@"
-    INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@"
-)
+if(NOT TARGET __zenohc_static)
+  add_library(__zenohc_static STATIC IMPORTED GLOBAL)
+  add_library(zenohc::static ALIAS __zenohc_static)
+  target_link_libraries(__zenohc_static INTERFACE @NATIVE_STATIC_LIBS@)
+  set_target_properties(__zenohc_static PROPERTIES
+      IMPORTED_LOCATION "${_IMPORT_PREFIX}/@CMAKE_INSTALL_LIBDIR@/@STATICLIB@"
+      INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@"
+  )
+endif()
 
-add_library(__zenohc_shared SHARED IMPORTED GLOBAL)
-add_library(zenohc::shared ALIAS __zenohc_shared)
-set_target_properties(__zenohc_shared PROPERTIES
-    IMPORTED_NO_SONAME TRUE
-    INTERFACE_COMPILE_DEFINITION ZENOHC_DYN_LIB
-    IMPORTED_LOCATION "${_IMPORT_PREFIX}/@CMAKE_INSTALL_LIBDIR@/@DYLIB@"
-    INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@"
-)
+if(NOT TARGET __zenohc_shared)
+  add_library(__zenohc_shared SHARED IMPORTED GLOBAL)
+  add_library(zenohc::shared ALIAS __zenohc_shared)
+  set_target_properties(__zenohc_shared PROPERTIES
+      IMPORTED_NO_SONAME TRUE
+      INTERFACE_COMPILE_DEFINITION ZENOHC_DYN_LIB
+      IMPORTED_LOCATION "${_IMPORT_PREFIX}/@CMAKE_INSTALL_LIBDIR@/@DYLIB@"
+      INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@"
+  )
+endif()
 
 if(NOT ("@IMPLIB@" STREQUAL ""))
     set_property(TARGET __zenohc_shared PROPERTY IMPORTED_IMPLIB "${_IMPORT_PREFIX}/@CMAKE_INSTALL_LIBDIR@/@IMPLIB@")
 endif()
 
-if(ZENOHC_LIB_STATIC)
+if(NOT TARGET zenohc::lib)
+  if(ZENOHC_LIB_STATIC)
     add_library(zenohc::lib ALIAS __zenohc_static)
-else()
+  else()
     add_library(zenohc::lib ALIAS __zenohc_shared)
+  endif()
 endif()