Merge pull request #98 from filippobrizzi/fix_cmake_install

Fix: cmake install shouldn't hardcode install path

Author: milyin

install/PackageConfig.cmake.in

@@ -14,14 +14,23 @@
 
 @PACKAGE_INIT@
 
+# Compute the installation prefix relative to this file.
+get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)
+if(_IMPORT_PREFIX STREQUAL "/")
+  set(_IMPORT_PREFIX "")
+endif()
+
 add_library(zenohcxx INTERFACE)
-target_include_directories(zenohcxx INTERFACE "@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@")
+target_include_directories(zenohcxx INTERFACE "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@")
 
 # zenohcxx for zenohpico
 if(TARGET zenohpico)
 	add_library(zenohcxx_zenohpico INTERFACE)
 	target_compile_definitions(zenohcxx_zenohpico INTERFACE ZENOHCXX_ZENOHPICO)
-    target_include_directories(zenohcxx_zenohpico INTERFACE "@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@")
+    target_include_directories(zenohcxx_zenohpico INTERFACE "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@")
 	add_dependencies(zenohcxx_zenohpico zenohpico)
 	target_link_libraries(zenohcxx_zenohpico INTERFACE zenohpico)
 	add_library(zenohcxx::zenohpico ALIAS zenohcxx_zenohpico)
@@ -32,7 +41,7 @@ if(TARGET zenohc::lib)
 	message(STATUS "defined lib target zenohcxx::zenohc::lib for zenohc::lib")
 	add_library(zenohcxx_zenohc_lib INTERFACE)
 	target_compile_definitions(zenohcxx_zenohc_lib INTERFACE ZENOHCXX_ZENOHC)
-    target_include_directories(zenohcxx_zenohc_lib INTERFACE "@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@")
+    target_include_directories(zenohcxx_zenohc_lib INTERFACE "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@")
 	add_dependencies(zenohcxx_zenohc_lib zenohc::lib)
 	target_link_libraries(zenohcxx_zenohc_lib INTERFACE zenohc::lib)
 	add_library(zenohcxx::zenohc::lib ALIAS zenohcxx_zenohc_lib)
@@ -43,7 +52,7 @@ if(TARGET zenohc::shared)
 	message(STATUS "defined lib target if(TARGET zenohc::shared for zenohc::shared")
 	add_library(zenohcxx_zenohc_shared INTERFACE)
 	target_compile_definitions(zenohcxx_zenohc_shared INTERFACE ZENOHCXX_ZENOHC)
-	target_include_directories(zenohcxx_zenohc_shared INTERFACE "@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@")
+	target_include_directories(zenohcxx_zenohc_shared INTERFACE "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@")
 	add_dependencies(zenohcxx_zenohc_shared zenohc::shared)
 	target_link_libraries(zenohcxx_zenohc_shared INTERFACE zenohc::shared)
 	add_library(zenohcxx::zenohc::shared ALIAS zenohcxx_zenohc_shared)
@@ -54,7 +63,7 @@ if(TARGET zenohc::static)
 	message(STATUS "defined lib target zenohcxx::zenohc::static for zenohc::static")
 	add_library(zenohcxx_zenohc_static INTERFACE)
 	target_compile_definitions(zenohcxx_zenohc_static INTERFACE ZENOHCXX_ZENOHC)
-    target_include_directories(zenohcxx_zenohc_static INTERFACE "@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@")
+    target_include_directories(zenohcxx_zenohc_static INTERFACE "${_IMPORT_PREFIX}/@CMAKE_INSTALL_INCLUDEDIR@")
 	add_dependencies(zenohcxx_zenohc_static zenohc::static)
 	target_link_libraries(zenohcxx_zenohc_static INTERFACE zenohc::static)
 	add_library(zenohcxx::zenohc::static ALIAS zenohcxx_zenohc_static)