[CMake] CMake with Qt (plus pkg-config)

[Robert Haines]

Hi,

On 22 Oct 2009, at 11:15, Murray Cumming wrote:

> I'm trying to use CMake for the first time, as an experiment, with
> little a Qt-based project. It also uses an additional library, via
> pkg-config.
>
> So far Qt's include files don't seem to be found, and I wonder how I  
> can
> cause moc to be used to generate some of the .cc files.
>
> Here's what I have so far:
> http://github.com/murraycu/qlom/blob/qlom_cmake/CMakeLists.txt
> based on the many and varied google results.

I've found CMake to work well with Qt4, but it does need a few more  
things set in your CMakeLists.txt. With CMake in general I have found  
that I have to load the FindXxx.cmake files into my editor to see what  
things are supported.

This is what I have in a project that also requires Qt3 support:

# find Qt4

find_package(Qt4 REQUIRED)
set(QT_USE_QT3SUPPORT 1)
set(QT_USE_QTXML 1)
include(${QT_USE_FILE})

So, set the options you need, then include the Qt Use file. The  
options are listed in FindQt4.cmake.

Then to do the moc'ing and build the app:

List your include files to be moc'ed in e.g. MY_INC_FILES and your cpp  
source code in e.g. MY_SRC_FILES...

qt4_wrap_cpp(MY_MOC_FILES ${MY_INC_FILES})
add_executable(my_app ${MY_SRC_FILES} ${MY_MOC_FILES})
target_link_libraries(my_app ${QT_LIBRARIES})

So the moc'ed files get passed into add_executable in the normal way!

Cheers,
Rob