Add forgotten porting fix, update CMake to give warning on incompatible Clang Version

CMakeLists.txt

-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.16)
 project(CTUApex)
 
 set(CMAKE_CXX_STANDARD 17)
 
 find_package(metacg REQUIRED)
-find_package(Clang REQUIRED)
+
+find_package(Clang REQUIRED CONFIG)
+message(STATUS "Found LLVM/Clang version " ${LLVM_VERSION})
+
+if("${LLVM_VERSION_MAJOR}" VERSION_LESS 15)
+    message(FATAL_ERROR "Found LLVM ${LLVM_VERSION_MAJOR}, but need LLVM 15 or above")
+endif()
+
 
 # set log level using -DLOG_LEVEL="INFO"|"DEBUG", defaults to "INFO"
 set(LOG_LEVEL "TRACE" CACHE STRING "")
@@ -29,7 +36,7 @@ add_executable(CTUApex
 target_include_directories(CTUApex PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/>)
 
-target_link_libraries(CTUApex metacg)
+target_link_libraries(CTUApex metacg::metacg)
 #target_link_libraries(CTUApex minicpr)
 target_link_libraries(CTUApex clangTooling)
 target_compile_options(CTUApex PUBLIC -fno-rtti)
\ No newline at end of file

src/main.cpp

@@ -147,7 +147,7 @@ int main(int argc, const char **argv) {
 
     auto &mcgManager = metacg::graph::MCGManager::get();
     mcgManager.addToManagedGraphs("emptyGraph", std::make_unique<metacg::Callgraph>());
-    mcgReader->read(mcgManager);
+    mcgReader->read();
     auto &cg = *mcgManager.getCallgraph();
     //Add extraction point gotten via the CLI
     for(const auto& extractionFunc : extractionPoints){