Qt5 development primer

Munawwar · wrote on 18 May 2013, 21:13

I think the wiki should mention that the build needs at least 3 GB of RAM to build WebKit.

sierdzio · wrote on 18 May 2013, 21:48

You can edit it any time.

Munawwar · wrote on 19 May 2013, 18:12

I was getting a "runtime/CodeCache.cpp
The bug is not reproducible, so it is likely a hardware or OS problem."
error when using make -j 4.
I had to do a make without specifying '-j 4' (which "I think is serial execution":http://www.gnu.org/software/make/manual/html_node/Parallel.html) for the build to work.

sierdzio · wrote on 19 May 2013, 18:16

Uncanny.

I'm routinely compiling various Qt versions, from 4.8 to 5.1, with make -j9 and never had an issue. Well, once :)

Maybe your "make" is outdated?

JKSH · wrote on 20 May 2013, 00:08

[quote author="Munawwar" date="1368987136"]I was getting a "runtime/CodeCache.cpp
The bug is not reproducible, so it is likely a hardware or OS problem."
error when using make -j 4.
I had to do a make without specifying '-j 4' (which "I think is serial execution":http://www.gnu.org/software/make/manual/html_node/Parallel.html) for the build to work.[/quote]What CPU, and how much RAM, do you have?

allenck · wrote on 23 May 2013, 21:45

I'm having problems getting Qt 5.1 to compile:

In file included from ../../include/QtWidgets/qgraphicsscene.h:1:0,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsview.h:48,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsview_p.h:56,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/qgraphicsview_p.h:1,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsitem_p.h:59,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicswidget_p.h:57,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/qgraphicswidget_p.h:1,
from kernel/qaction_p.h:58,
from kernel/qactiongroup.cpp:46:
../../include/QtWidgets/../../src/widgets/graphicsview/qgraphicsscene.h:160:24: error: missing binary operator before token "("
../../include/QtWidgets/../../src/widgets/graphicsview/qgraphicsscene.h:167:24: error: missing binary operator before token "("
../../include/QtWidgets/../../src/widgets/graphicsview/qgraphicsscene.h:174:24: error: missing binary operator before token "("
In file included from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsitem_p.h:56:0,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicswidget_p.h:57,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/qgraphicswidget_p.h:1,
from kernel/qaction_p.h:58,
from kernel/qaction.cpp:46:
../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsitem.h:176:24: error: missing binary operator before token "("
../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsitem.h:240:24: error: missing binary operator before token "("
../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsitem.h:298:24: error: missing binary operator before token "("
In file included from ../../include/QtWidgets/qgraphicsscene.h:1:0,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsview.h:48,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsview_p.h:56,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/qgraphicsview_p.h:1,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicsitem_p.h:59,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/../../../../../src/widgets/graphicsview/qgraphicswidget_p.h:57,
from ../../include/QtWidgets/5.1.0/QtWidgets/private/qgraphicswidget_p.h:1,
from kernel/qaction_p.h:58,
from kernel/qaction.cpp:46:
../../include/QtWidgets/../../src/widgets/graphicsview/qgraphicsscene.h:160:24: error: missing binary operator before token "("
../../include/QtWidgets/../../src/widgets/graphicsview/qgraphicsscene.h:167:24: error: missing binary operator before token "("
../../include/QtWidgets/../../src/widgets/graphicsview/qgraphicsscene.h:174:24: error: missing binary operator before token "("
In file included from kernel/qactiongroup.cpp:382:0:
.moc/release-shared/moc_qactiongroup.cpp:15:2: error: #error "This file was generated using the moc from 5.1.0. It"
.moc/release-shared/moc_qactiongroup.cpp:16:2: error: #error "cannot be used with the include files from this version of Qt."
.moc/release-shared/moc_qactiongroup.cpp:17:2: error: #error "(The moc has changed too much.)"
In file included from ../../include/QtWidgets/qaction.h:1:0,
from kernel/qactiongroup.h:45,
from kernel/qactiongroup.cpp:42:
../../include/QtWidgets/../../src/widgets/kernel/qaction.h:61:32: error: expected initializer before ‘:’ token
In file included from kernel/qaction.cpp:1313:0:
.moc/release-shared/moc_qaction.cpp:15:2: error: #error "This file was generated using the moc from 5.1.0. It"
.moc/release-shared/moc_qaction.cpp:16:2: error: #error "cannot be used with the include files from this version of Qt."
.moc/release-shared/moc_qaction.cpp:17:2: error: #error "(The moc has changed too much.)"
In file included from kernel/qaction.cpp:42:0:
kernel/qaction.h:61:32: error: expected initializer before ‘:’ token
make[3]: *** [.obj/release-shared/qactiongroup.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: *** [.obj/release-shared/qaction.o] Error 1
make[3]: Leaving directory /media/usb_700_ext4/qt5/qtbase/src/widgets' make[2]: *** [sub-widgets-make_first] Error 2 make[2]: Leaving directory /media/usb_700_ext4/qt5/qtbase/src'
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory `/media/usb_700_ext4/qt5/qtbase'
make: *** [module-qtbase-make_first] Error 2
allen@ubuntu:/media/usb_700_ext4/qt5$

Can anybody explain why?

JKSH · wrote on 24 May 2013, 00:57

[quote author="allenck" date="1369345509"].moc/release-shared/moc_qactiongroup.cpp:15:2: error: #error “This file was generated using the moc from 5.1.0. It”
.moc/release-shared/moc_qactiongroup.cpp:16:2: error: #error “cannot be used with the include files from this version of Qt.”[/quote]It looks like you have multiple versions of Qt in your environment. Remove the older one from your PATH, clean your build tree (i.e. delete all the files that have been compiled so far), and try again.

Also, what compiler are you using? How did you configure + build Qt?

allenck · wrote on 24 May 2013, 03:43

Thanks. I checked the requirements as it pertained to environment variables but didn't check the path. Undoubtedly that is the reason as the compile seems to be working OK, so far, on another machine.

The compiler is g++ and I was using these configuration settings:
./configure -prefix $PWD/qtbase -opensource -nomake tests -system-sqlite -plugin-sql-sqlite -plugin-sql-odbc -plugin-sql-mysql -nomake demo -nomake examples

cmeyer · wrote on 5 Aug 2013, 18:25

I am building from source on Windows with VS2012.

I update the sources from git using the command:

qtrepotools\bin\qt5_tool -p --Branch stable

The problem occurs because the headers in qtbase\include don't get updated when I 'nmake' and those include files are in the include path for each of the subdirectories.

Any idea what I need to do to get the sources to build after updating?

If I make clean, run configure again, and nmake everything works. But it would be better if I didn't have to take those steps every time.

JKSH · wrote on 6 Aug 2013, 00:59

[quote author="cmeyer" date="1375727141"]If I make clean, run configure again, and nmake everything works.[/quote]Hi,

That IS the expected procedure. configure performs some bootstrapping and builds a small subset of qtbase.git, which is then used to build the rest of Qt. After you update the code, you have to re-bootstrap (i.e. rerun configure)

You can simplify things by writing a Batch file to run configure with the options you want.

cmeyer · wrote on 6 Aug 2013, 01:39

[quote author="JKSH" date="1375750792"][quote author="cmeyer" date="1375727141"]If I make clean, run configure again, and nmake everything works.[/quote]Hi,

That IS the expected procedure. configure performs some bootstrapping and builds a small subset of qtbase.git, which is then used to build the rest of Qt. After you update the code, you have to re-bootstrap (i.e. rerun configure)[/quote]

Actually I tried the reconfigure and it still fails. What does work is doing the "really clean" clean, then configure and rebuild:

git submodule foreach --recursive "git clean -dfx"

Maybe the mistake I made this time was not cleaning before updating from the repository. Ugh. And now I'm stuck in some strange state that requires a "really clean" clean and rebuild.

rockdemon · wrote on 15 Aug 2013, 10:00

sudo apt-add-repository ppa:u-szeged/sedkit && sudo apt-get update && sudo apt-get install sedkit-env-qtwebkit in ubuntu gives me the following errors:

W: Failed to fetch http://ppa.launchpad.net/u-szeged/sedkit/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/u-szeged/sedkit/ubuntu/dists/raring/main/binary-i386/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

Am i making some newbie linux mistake or is this method currently broken?

Thanks,

Rich

bitu · wrote on 16 Aug 2013, 07:39

[[blank-post-content-placeholder]]

bitu · wrote on 19 Aug 2013, 07:17

I had to give root permission to run this script & fix this issue.
But why it is required to give root permission to run script that is present inside my working directory

JKSH · wrote on 20 Aug 2013, 12:57

[quote author="rockdemon" date="1376560830"]W: Failed to fetch http://ppa.launchpad.net/u-szeged/sedkit/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found[/quote]It looks like U-Szeged Team has become inactive. They only created packages up till Ubuntu 12.10 (Quantal Quetzal): http://ppa.launchpad.net/u-szeged/sedkit/ubuntu/dists/ Unfortunately that means you can't use this method for Ubuntu 13.04 (Raring Ringtail)

[quote author="bitu" date="1376896656"]I had to give root permission to run this script & fix this issue.
But why it is required to give root permission to run script that is present inside my working directory[/quote]What script, for what issue?

Did you remember to give it execution permissions? (chmod +x, or right-click -> Properties -> Permissions -> Execute) No script is allowed to run unless they have been given permission.

rockdemon · wrote on 2 Sept 2013, 09:12

thanks for the info :)

I got it working the manual way so all good in the end :)

Cheers,

Rich

[quote author="JKSH" date="1377003458"][quote author="rockdemon" date="1376560830"]W: Failed to fetch http://ppa.launchpad.net/u-szeged/sedkit/ubuntu/dists/raring/main/binary-amd64/Packages 404 Not Found[/quote]It looks like U-Szeged Team has become inactive. They only created packages up till Ubuntu 12.10 (Quantal Quetzal): http://ppa.launchpad.net/u-szeged/sedkit/ubuntu/dists/ Unfortunately that means you can't use this method for Ubuntu 13.04 (Raring Ringtail)

[quote author="bitu" date="1376896656"]I had to give root permission to run this script & fix this issue.
But why it is required to give root permission to run script that is present inside my working directory[/quote]What script, for what issue?

Did you remember to give it execution permissions? (chmod +x, or right-click -> Properties -> Permissions -> Execute) No script is allowed to run unless they have been given permission.[/quote]

dor666 · wrote on 3 Dec 2013, 08:10

How to properly build qt for both 32bit and 64bit (using Ubuntu 64)?

gmabey · wrote on 12 Dec 2013, 14:23

In the Issues section at the end, one helpful hint may be to describe the error where configure fails on MacOS when certain brew or port packages have been installed with a message that says that no XCB lib found, like this:

Running configuration tests...
The test for linking against libxcb and support libraries failed!
You might need to install dependency packages, or pass -qt-xcb.
See src/plugins/platforms/xcb/README.

The easy workaround is to pass -no-pkg-config to configure.

See also this patch which has not yet been accepted:

https://codereview.qt-project.org/#change,67213,patchset=1

gmabey · wrote on 18 Dec 2013, 13:52

In the System Requirements -> Windows -> Windows Graphics Drivers section where it says that the DirectX SDK must be installed, perhaps this link

http://www.microsoft.com/en-us/download/details.aspx?id=6812

would be a more useful one than what's there:

http://msdn.microsoft.com/en-us/directx/default.aspx

That is, we don't want to read about DirectX, we just want to download and install the SDK and get on with using Qt! ;-)

gmabey · wrote on 20 Dec 2013, 14:07

I certainly don't see this stated in the wiki page, but it seems to me that flex is required whenever using Angle… This was in a build of qtbase only, so I'm pretty sure it wasn't a webkit option that caused this build failure:

win_flex --noline --nounistd --outfile=Tokenizer.cpp ........\3rdparty\angle\src\compiler\preprocessor\Tokenizer.l
'win_flex' is not recognized as an internal or external command,