cmakelists flags addition and fix

Author: nikhilbhatia08

CMakeLists.txt

@@ -261,6 +261,9 @@ option(WITH_METRICS_EXEMPLAR_PREVIEW
 option(WITH_THREAD_INSTRUMENTATION_PREVIEW
        "Whether to enable thread instrumentation" OFF)
 
+option(WITH_RESOURCE_DETECTORS_PREVIEW
+       "Whether to enable inbuilt resource detectors" OFF)
+
 option(OPENTELEMETRY_SKIP_DYNAMIC_LOADING_TESTS
        "Whether to build test libraries that are always linked as shared libs"
        OFF)
@@ -645,7 +648,9 @@ if(NOT WITH_API_ONLY)
   add_subdirectory(sdk)
   add_subdirectory(ext)
   add_subdirectory(exporters)
-  add_subdirectory(resource_detectors)
+  if(WITH_RESOURCE_DETECTORS_PREVIEW)
+    add_subdirectory(resource_detectors)
+  endif()
 
   if(BUILD_TESTING)
     add_subdirectory(test_common)

resource_detectors/CMakeLists.txt

@@ -12,8 +12,8 @@ target_link_libraries(opentelemetry_resource_detectors
                       PUBLIC opentelemetry_resources)
 target_include_directories(
   opentelemetry_resource_detectors
-  PUBLIC "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/resource_detectors/include>"
-         "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/sdk/include>")
+  PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>"
+         "$<INSTALL_INTERFACE:include>")
 
 otel_add_component(
   COMPONENT