On Jul 19, 2010, at 4:28 PM, Michael Wild wrote:
On 19. Jul, 2010, at 19:59 , Michael Jackson wrote:
Wonder why I have never seen this before but with CMake 2.8.x and a
Qt4 based project on OS X when finding the Qt4 frameworks only the
release version is found, ie, the Debug version that is located
inside the framework is NOT found by default.
My question is: is this a bug, a "feature" or should I be using the
DYLD_IMAGE_SUFFIX environment variable instead?
The offending code is in the FindQt4.cmake file around lines 772:
FIND_LIBRARY(QT_${_upper_qt_module}_LIBRARY_DEBUG
NAMES ${QT_MODULE}${QT_LIBINFIX}_debug ${QT_MODULE}$
{QT_LIBINFIX}d ${QT_MODULE}${QT_LIBINFIX}d4
PATHS ${QT_LIBRARY_DIR} NO_DEFAULT_PATH
)
I would imagine that the cmake code above is going to try and find
QtCore_debug.framework and NOT QtCore.framework/versions/current/
QtCore_debug
Thoughts?
___________________________________________________________
Mike Jackson www.bluequartz.net
Principal Software Engineer mike.jack...@bluequartz.net
BlueQuartz Software Dayton, Ohio
Reading http://doc.trolltech.com/4.6/mac-differences.html#qt-libraries-as-frameworks
seems to indicate that either setting DYLD_IMAGE_SUFFIX is one way
to go, renaming the embedded library another. Not sure it would be
all that desirable to explicitly link against the debug versions on
Mac OS X...
Michael
Knowing how CMake was searching for the frameworks I ended up creating
some symlinks to the QtCore.framework and QtGui.framework.
QtCore_debug.framework points to QtCore.framework and the same for the
other frameworks. This actually allowed CMake to find the debug
libraries. Once those libraries were found I could then actually link
against the debug versions. Which allows me to debug down into Qt
itself which is what I needed.
I agree that if you trust Qt and have no need to debug down into
Qt then linking against the Debug versions probably is not needed.
Setting the DYLD_IMAGE_SUFFIX environment variable to "_debug" caused
the launching of my app inside gdb to go from about 10 seconds to 2
minutes as gdb was trying to load the debug version of every library
that the app links against, plus all of their dependencies. By linking
directly to the debug versions of the Qt libraries the launch times
only increased a small amount.
I don't think there is really any type of patch that I could
submit. Merely creating the symlinks in the Qt/lib installation
directory seems to have solved the issue, at least for me.
Thanks for the sanity check
Mike Jackson
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