fix JSON reading

CMakeLists.txt

@@ -35,12 +35,14 @@ FILE(GLOB TGC_VM_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/src/vm/interp/vm_*.cpp)
 set(LIB_SOURCES 
     src/vm/fp_functions.cpp
     src/plugin/instruction_count.cpp
-    src/plugin/cycle_estimate.cpp
     src/plugin/cov.cpp
     
     ${TGC_SOURCES}
     ${TGC_VM_SOURCES}
 )
+if(TARGET RapidJSON)
+    list(APPEND LIB_SOURCES src/plugin/cycle_estimate.cpp)
+endif()
 
 if(WITH_LLVM)
 	FILE(GLOB TGC_LLVM_SOURCES
@@ -82,6 +84,10 @@ elseif(TARGET elfio::elfio)
 else()
     message(FATAL_ERROR "No elfio library found, maybe a find_package() call is missing")
 endif()
+if(TARGET RapidJSON)
+    target_link_libraries(${PROJECT_NAME} PUBLIC RapidJSON)
+endif()
+
 
 set_target_properties(${PROJECT_NAME} PROPERTIES
   VERSION ${PROJECT_VERSION}