Add possibility utilize generated headers

- Add generated headers folder to _gen target PUBLIC include directories set

cmake/QtProtobufCommon.cmake

@@ -68,5 +68,4 @@ function(add_test_target)
     endif()
     add_dependencies(${add_test_target_TARGET} ${QtProtobuf_GENERATED})
     target_link_libraries(${add_test_target_TARGET} gtest_main gtest ${QtProtobuf_GENERATED} ${QTPROTOBUF_COMMON_NAMESPACE}::QtProtobuf ${QTPROTOBUF_COMMON_NAMESPACE}::QtGrpc Qt5::Core Qt5::Qml Qt5::Network)
-    target_include_directories(${add_test_target_TARGET} PRIVATE ${GENERATED_SOURCES_DIR})
 endfunction(add_test_target)

examples/addressbook/CMakeLists.txt

@@ -33,7 +33,6 @@ file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../addressbookserver/cert.pem DESTINATION
 
 add_executable(${TARGET} ${SOURCES} resources.qrc)
 add_dependencies(${TARGET} ${QtProtobuf_GENERATED} examples_common)
-target_include_directories(${TARGET} PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/generated)
 target_link_libraries(${TARGET} examples_common QtProtobufProject::QtProtobuf QtProtobufProject::QtGrpc ${QtProtobuf_GENERATED} Qt5::Quick Qt5::Qml)
 
 set(CLIENT_EXEC_PATH ${CMAKE_CURRENT_BINARY_DIR}/${TARGET} PARENT_SCOPE)

examples/simplechat/CMakeLists.txt

@@ -30,7 +30,6 @@ file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/../simplechatserver/cert.pem DESTINATION $
 
 add_executable(${TARGET} ${SOURCES} resources.qrc)
 add_dependencies(${TARGET} ${QtProtobuf_GENERATED} examples_common)
-target_include_directories(${TARGET} PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/generated)
 target_link_libraries(${TARGET} examples_common QtProtobufProject::QtProtobuf QtProtobufProject::QtGrpc ${QtProtobuf_GENERATED} Qt5::Quick Qt5::Qml)
 
 set(CLIENT_EXEC_PATH ${CMAKE_CURRENT_BINARY_DIR}/${TARGET} PARENT_SCOPE)

src/protobuf/QtProtobufGen.cmake.in

@@ -55,7 +55,7 @@ function(generate_qtprotobuf)
     set_source_files_properties(${QTPROTOBUF_GENERATED_SOURCES} PROPERTIES GENERATED TRUE)
     add_library(${QtProtobuf_GENERATED} ${QTPROTOBUF_GENERATED_SOURCES} ${MOC_SOURCES})
     add_dependencies(${QtProtobuf_GENERATED} ${GEN_TARGET})
-    target_include_directories(${QtProtobuf_GENERATED} PRIVATE ${Qt5Core_INCLUDE_DIRS}
+    target_include_directories(${QtProtobuf_GENERATED} PUBLIC ${OUT_DIR} PRIVATE ${Qt5Core_INCLUDE_DIRS}
         $<TARGET_PROPERTY:@QTPROTOBUF_COMMON_NAMESPACE@::QtProtobuf,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:@QTPROTOBUF_COMMON_NAMESPACE@::QtGrpc,INTERFACE_INCLUDE_DIRECTORIES> ${OUT_DIR})
 endfunction()