CMake/Tutorials/Qt

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A typical CMakeLists.txt file for a Qt project looks like this:

cmake_minimum_required(VERSION 2.6)
PROJECT(TestProject)
 
FIND_PACKAGE(Qt4 REQUIRED)
INCLUDE(${QT_USE_FILE})
 
QT4_WRAP_UI(UISrcs MyWidget.ui)
QT4_WRAP_CPP(MOCSrcs MyWidget.h)
 
include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
 
ADD_EXECUTABLE(MyProject main.cpp MyWidget.cpp ${MOCSrcs} ${UISrcs})
TARGET_LINK_LIBRARIES(MyProject ${QT_LIBRARIES})

However, when you build and run in Windows, you will get a console window that appears along with your GUI program. To fix this, you must do two things. First, add ${QT_QTMAIN_LIBRARY} to your target_link_libraries command. Second, you must specify /SUBSYSTEM:WINDOWS for all build configurations (Release, Debug, etc) that you want to not pop up the console window. An example is below, where when built in release mode, no console will appear:

cmake_minimum_required(VERSION 2.6)
 
PROJECT(FileMenu)
 
FIND_PACKAGE(Qt4 REQUIRED)
INCLUDE(${QT_USE_FILE})
 
QT4_WRAP_UI(UISrcs MyWidget.ui)
QT4_WRAP_CPP(MOCSrcs MyWidget.h)
 
include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})
 
ADD_EXECUTABLE(TestProject main.cpp MyWidget.cpp ${MOCSrcs} ${UISrcs})
TARGET_LINK_LIBRARIES(TestProject ${QT_QTMAIN_LIBRARY} ${QT_LIBRARIES})
 
IF(WIN32) # Check if we are on Windows
  if(MSVC) # Check if we are using the Visual Studio compiler
    set_target_properties(TestProject PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:WINDOWS")
  elseif(CMAKE_COMPILER_IS_GNUCXX)
    # SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mwindows") # Not tested
  else()
    message(SEND_ERROR "You are using an unsupported Windows compiler! (Not MSVC or GCC)")
  endif()
elseif(UNIX)
  # Nothing special required
else()
  message(SEND_ERROR "You are on an unsupported platform! (Not Win32 or Unix)")
ENDIF()

If you want to set this for all build modes, instead of a line like:

set_target_properties(TestProject PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:WINDOWS")

use:

set_target_properties(FileMenu PROPERTIES LINK_FLAGS "/SUBSYSTEM:WINDOWS") # works for all build modes