implement usage of external osi

Signed-off-by: Timm Ruppert <[email protected]>

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.16)
-project(osi-utilities)
+project(asam-osi-utilities)
 
-# Som features (e.g. mcap) require at least C++17
+# Some features (e.g. mcap) require at least C++17
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # Generate compile_commands.json for clang based tools
@@ -14,21 +14,27 @@ include_directories(${PROJECT_SOURCE_DIR}/include)
 option(USE_EXTERNAL_OSI "Use an external version of open_simulation_interface" OFF)
 option(LINK_WITH_SHARED_OSI "Link utils with shared OSI library instead of statically linking" OFF)
 
-# Locate open_simulation_interface using find_package or custom path.
+# Locate open_simulation_interface using internal or find_package.
 if (USE_EXTERNAL_OSI)
-    message(FATAL_ERROR "Not implemented yet")
+    # if you use this library in your project, you need to add
+    # something lik list(APPEND CMAKE_PREFIX_PATH ${CMAKE_BINARY_DIR}/lib/open-simulation-interface)
+    # to your CMakeLists.txt to find the open_simulation_interface package.
+    find_package(open_simulation_interface QUIET REQUIRED)
+    message(STATUS "Using external OSI, provided by ${open_simulation_interface_DIR}")
+
 else ()
     # Download and use our own open_simulation_interface package.
     include(FetchContent)
+    message(STATUS "Using internal OSI, downloading open_simulation_interface...")
     FetchContent_Declare(
             open_simulation_interface
             GIT_REPOSITORY https://github.com/OpenSimulationInterface/open-simulation-interface.git
             GIT_TAG v3.7.0
     )
     FetchContent_MakeAvailable(open_simulation_interface)
-    set(OSI_INCLUDE_DIR ${open_simulation_interface_BINARY_DIR})
 endif ()
 
+
 # option to enable coverage reporting
 option(CODE_COVERAGE "Enable coverage reporting" OFF)
 if (CODE_COVERAGE AND CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")

src/CMakeLists.txt

@@ -36,8 +36,9 @@ if (LINK_WITH_SHARED_OSI)
     target_link_libraries(OSIUtilities PRIVATE open_simulation_interface)
 else ()
     target_link_libraries(OSIUtilities PRIVATE open_simulation_interface_pic)
-    include_directories(${OSI_INCLUDE_DIR})
 endif ()
+include_directories(${open_simulation_interface_BINARY_DIR})
+
 
 # get mcap and its dependencies
 find_package(PkgConfig REQUIRED)