Update example CMake usage to best practices

c++/cmake/CapnProtoConfig.cmake.in

@@ -9,9 +9,9 @@
 # Example usage:
 #   find_package(CapnProto)
 #   capnp_generate_cpp(CAPNP_SRCS CAPNP_HDRS schema.capnp)
-#   include_directories(${CMAKE_CURRENT_BINARY_DIR})
 #   add_executable(foo main.cpp ${CAPNP_SRCS})
-#   target_link_libraries(foo CapnProto::capnp)
+#   target_link_libraries(foo PRIVATE CapnProto::capnp)
+#   target_include_directories(foo PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 #
 # If you are using RPC features, use 'CapnProto::capnp-rpc' in the target_link_libraries() call.
 #

c++/cmake/CapnProtoMacros.cmake

@@ -3,12 +3,12 @@
 # Example usage:
 #   find_package(CapnProto)
 #   capnp_generate_cpp(CAPNP_SRCS CAPNP_HDRS schema.capnp)
-#   include_directories(${CMAKE_CURRENT_BINARY_DIR})
 #   add_executable(foo main.cpp ${CAPNP_SRCS})
-#   target_link_libraries(foo CapnProto::capnp-rpc)
+#   target_link_libraries(foo PRIVATE CapnProto::capnp-rpc)
+#   target_include_directories(foo PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 #
-#  If you are using not using the RPC features you can use
-#  'CapnProto::capnp' in target_link_libraries call
+#  If you are not using the RPC features you can use 'CapnProto::capnp' in the
+#  target_link_libraries call
 #
 # Configuration variables (optional):
 #   CAPNPC_OUTPUT_DIR

c++/samples/CMakeLists.txt

@@ -23,7 +23,7 @@ find_package(CapnProto CONFIG REQUIRED)
 
 capnp_generate_cpp(addressbookSources addressbookHeaders addressbook.capnp)
 add_executable(addressbook addressbook.c++ ${addressbookSources})
-target_link_libraries(addressbook CapnProto::capnp)
+target_link_libraries(addressbook PRIVATE CapnProto::capnp)
 target_include_directories(addressbook PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 
 # Don't build the rpc sample if find_package() found an installation of Cap'n Proto lite.
@@ -31,8 +31,8 @@ if(TARGET CapnProto::capnp-rpc)
   capnp_generate_cpp(calculatorSources calculatorHeaders calculator.capnp)
   add_executable(calculator-client calculator-client.c++ ${calculatorSources})
   add_executable(calculator-server calculator-server.c++ ${calculatorSources})
-  target_link_libraries(calculator-client CapnProto::capnp-rpc)
-  target_link_libraries(calculator-server CapnProto::capnp-rpc)
+  target_link_libraries(calculator-client PRIVATE CapnProto::capnp-rpc)
+  target_link_libraries(calculator-server PRIVATE CapnProto::capnp-rpc)
   target_include_directories(calculator-client PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
   target_include_directories(calculator-server PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 endif()