QOpenGLWidget doesn't draw OpenGL frame on macOS Mojave until a resize event occurs while built with CMake

[anthel]

Greetings:

I noticed that my QOpenGLWidget-based application (Qt ver. 5.12.0) doesn't display the OpenGL portion of the window until the window is resized on macOS Mojave (ver. 10.14.2) if I build with CMake as opposed to qmake. I observed this issue with Qt's "hellogl2" example as well. Does anyone have any thoughts? I have the "hellogl2" project file below along with what I thought its appropriate CMake counterpart would be (heavily influenced from Qt's CMake Manual). Thank you for your help with this.

File hellogl2.pro

HEADERS       = glwidget.h \
                window.h \
                mainwindow.h \
                logo.h
SOURCES       = glwidget.cpp \
                main.cpp \
                window.cpp \
                mainwindow.cpp \
                logo.cpp

QT           += widgets

# install
target.path = $$[QT_INSTALL_EXAMPLES]/opengl/hellogl2
INSTALLS += target

Corresponding CMakeLists.txt:

cmake_minimum_required(VERSION 3.1.0)

# Define project name
project(hellogl2)

# set desired Qt version
set(QT_VERSION_REQ "5.12.0")

# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)

# Instruct CMake to run moc automatically when needed
set(CMAKE_AUTOMOC ON)

# Create code from a list of Qt Designer ui files
set(CMAKE_AUTOUIC ON)

# Find libraries
# find_package(Qt5Core ${QT_VERSION_REQ} CONFIG REQUIRED)
# find_package(Qt5Quick ${QT_VERSION_REQ} CONFIG REQUIRED)
find_package(Qt5Widgets ${QT_VERSION_REQ} CONFIG REQUIRED)
# find_package(Qt5Gui ${QT_VERSION_REQ} CONFIG REQUIRED)

set(hellogl2_SRCS
    mainwindow.cpp
    window.cpp
    glwidget.cpp
    logo.cpp
    main.cpp
)

# Tell CMake to create the executable
add_executable(${PROJECT_NAME} MACOSX_BUNDLE ${hellogl2_SRCS})

target_link_libraries(${PROJECT_NAME}
    Qt5::Widgets
)

Kind regards,
Anthony