Revert use of ecal_helpers in serialization sub-project

Author: DownerCase

serialization/capnproto/capnproto/CMakeLists.txt

@@ -21,7 +21,8 @@ find_package(CapnProto REQUIRED)
 ##########################
 # Capnproto core communication extension
 ##########################
-ecal_add_interface_library(capnproto_core)
+add_library(capnproto_core INTERFACE)
+add_library(eCAL::capnproto_core ALIAS capnproto_core)
 
 target_link_libraries(capnproto_core 
   INTERFACE 

serialization/flatbuffers/flatbuffers/CMakeLists.txt

@@ -21,7 +21,8 @@ find_package(FlatBuffers REQUIRED)
 ##########################
 # FlatBuffers core communication extension
 ##########################
-ecal_add_interface_library(flatbuffers_core)
+add_library(flatbuffers_core INTERFACE)
+add_library(eCAL::flatbuffers_core ALIAS flatbuffers_core)
 
 target_link_libraries(flatbuffers_core 
   INTERFACE 

serialization/protobuf/protobuf/CMakeLists.txt

@@ -46,6 +46,8 @@ target_link_libraries(protobuf_base PUBLIC protobuf::libprotobuf)
 
 target_compile_features(protobuf_base PUBLIC cxx_std_14)
 
+ecal_add_compiler_warnings(protobuf_base)
+
 install(
   TARGETS protobuf_base
   EXPORT eCALCoreTargets  
@@ -59,7 +61,8 @@ set_property(TARGET protobuf_base PROPERTY FOLDER core)
 ##########################
 # Protobuf core communication extension
 ##########################
-ecal_add_interface_library(protobuf_core)
+add_library(protobuf_core INTERFACE)
+add_library(eCAL::protobuf_core ALIAS protobuf_core)
 
 target_link_libraries(protobuf_core 
   INTERFACE 

serialization/string/string/CMakeLists.txt

@@ -23,7 +23,8 @@
 
 # std::string core communication extension
 ##########################
-ecal_add_interface_library(string_base)
+add_library(string_base INTERFACE)
+add_library(eCAL::string_base ALIAS string_base)
 
 target_sources(string_base
   INTERFACE
@@ -47,7 +48,8 @@ install(
 ##########################
 # std::string core communication extension
 ##########################
-ecal_add_interface_library(string_core)
+add_library(string_core INTERFACE)
+add_library(eCAL::string_core ALIAS string_core)
 
 target_link_libraries(string_core 
   INTERFACE