Link CorePrivate from Qt6

Question

I am writing a server using QtHttpServer (from Qt6). It's time to implement chats for the system using web sockets, but it hasn't been added to Qt6 yet. I see two ways out – either use long-pulling instead of web sockets, or download the web sockets code from qt5 and add it to the project. I decided to try the second option first, but I ran into a problem – the project uses QObjectPrivate. I understand that it is part of the CorePrivate library. I tried to link it, but it didn't work. Can you tell me if this can be solved somehow in Qt6?

cmake:

find_package(Qt6 COMPONENTS CorePrivate Core Network Sql HttpServer REQUIRED)

...

add_executable(${PROJECT_NAME} ${HEADERS} ${SOURCES})
target_link_libraries(${PROJECT_NAME} Qt6::CorePrivate Qt6::Core Qt6::Network Qt6::Sql Qt6::HttpServer)

error:

CMake Error at CMakeLists.txt:12 (find_package):
  Found package configuration file:

    /usr/local/opt/qt/lib/cmake/Qt6/Qt6Config.cmake

  but it set Qt6_FOUND to FALSE so package "Qt6" is considered to be NOT
  FOUND.  Reason given by package:

  Failed to find Qt component "CorePrivate" config file at ""

  Failed to find Qt component "Core" config file at ""

  Failed to find Qt component "Network" config file at ""

  Failed to find Qt component "Sql" config file at ""

  Failed to find Qt component "HttpServer" config file at ""

Without CorePrivate cmake runs successfully.

codeling · Accepted Answer · 2025-11-12 15:16:32Z

3

It seems CorePrivate is part of the Core component so you don't need to add it in your find_package.

All you need to do is to call Qt6::CorePrivate in target_link_libraries.

For Qt >= 6.10, you actually have to add CorePrivate as a separate component (see 6.10 Build System Changes

Source: Qt Documentation — Qt Core Private C++ Classes.

edited Nov 12 at 15:16

codeling

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answered May 23, 2022 at 9:15

Maniform

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1 Comment

xiota Sep 29 at 23:22

This answer will no longer be accurate after Qt 6.10 is released.

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