Error building Qt Creator 2.8.1 with Qt 5.1.1 on Debian (with no prior installations)

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I am setting up a development environment to build and debug using Qt and Qt Creator on Debian Linux. I got an error while building Qt Creator. (The error is at the bottom of this post.) I am not too familiar with building from the source (or really working on Linux), so I am asking for help on how to continue. Here are the steps that I took:

Right after getting Debian 7 installed, I downloaded the Qt 5.1.1 and Qt Creator 2.8.1 source files from qt-project.org/downloads (and extracted the files).

I installed Build Essentials with the command:
$ apt-get install build-essential perl python
Also installed:
$ apt-get install "^libxcb.*" libx11-xcb-dev libglu1-mesa-dev libxrender-dev

I configured Qt with:
$ ./configure -opensource -confirm-license
And then ran make:
$ make

Once make completed, I ran (from a root terminal):
$ make install

I found I needed to make sure PATH included the Qt bin folder, so I edited /etc/profile to include /usr/local/Qt-5.1.1/bin and the end of PATH.

After this, I restarted to get the changes in /etc/profile, and qmake appeared to be running properly:
$ qmake -v
@QMake version 3.0
Using Qt version 5.1.1 in /usr/local/Qt-5.1.1/lib@

So next I try to build Qt Creator with the following commands (according to the README):
$ qmake -r
$ make

make stops with the following error:
@In file included from /usr/local/Qt-5.1.1/include/QtCore/QList:1:0,
from ./tools/error.h:36
from tools/setupprojectparameters.h:34,
from tools/setupprojectparameters.cpp:29:
/usr/local/Qt-5.1.1/include/QtCore/qlist.h: In function ’void qbs::provideValuesTree(const QVariantMap&, QVariantMap*)’:
/usr/local/Qt-5.1.1/include/QtCore/qlist.h:622:5: error: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Werror=strict-overflow]
cc1plus: all warnings being treated as errors
make[3]: *** [setupprojectparameters.o] Error 1
make[2]: *** [sub----shared-qbs-src-lib-make_first] Error 2
make[1]: *** [sub-libs-make_first-ordered] Error 2
make: *** [sub-src-make_first-ordered] Error 2@

So, did I miss something? More importantly, what do I need to do from here to get Qt Creator up and running?

hskoglund

Hi, I've just stumbled upon the same problem, it seems that gcc gets confused re. that line no. 622 (in /usr/local/Qt-5.1.1/include/QtCore/qlist.h), if you help it out by just tweaking it:

Original code (line 622 and 623 in qlist.h):
@
if (alength < 0 || pos + alength > size())
alength = size() - pos;
@

to this:
@
if (alength < 0 || pos > size() - alength)
alength = size() - pos;
@
gcc is happy again and you'll have your Qt Creator up and running. (At least I had :-)