cmake. add_subdirectory shows error "No such file or directory"

BrMisha

Hello!
I want to move from the qmake to the cmake, that will my first experience with the cmake.
I need to add some subdirectory contains the CMakeLists (similar *.pri using the qmake).

add_subdirectory(drc)

Inside the internal CMakeLists i added next:

cmake_minimum_required(VERSION 3.5)

project(DRC)

add_executable(DRC
        drcwidget.cpp drcwidget.h
)

drcwidget uses QWidget. Finaly i got build error:

drc/drcwidget.h:4:10: fatal error: QWidget: No such file or directory

Why doesn't drc/CMakeLists.txt see QWidget included in main CMakeLists.txt?

Christian Ehrlicher

When you use a Qt library you also have to link against it. See e.g. the documentation for QWidget class - the first table.