Tag: Qt

Qt correct setup for QMAKESPEC, QTDIR and PATH

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When you want to use different configurations for different platforms in your .pro file, it’s necessary to correctly setup three variables: QMAKESPEC, QTDIR and PATH.

Here is how to configure for different platforms:

Microsoft Windows:

In SystemPropertes -> Enviroment variables add/update following values:

QTDIR = P:\QT\4.7.0
PATH = %QTDIR%\bin
QMAKESPEC=%QTDIR%\mkspecs\win32-msvc2005
LANG = en_US

Unix Bourne shell: (not tested)

QMAKESPEC=/usr/local/qt/mkspecs/linux-g++
PATH=$PATH:/local/qmake/bin
export QMAKESPEC PATH</pre>

Unix C shell: (not tested)

setenv QMAKESPEC /usr/local/qt/mkspecs/linux-g++
setenv PATH $PATH:/local/qmake/bin</pre>

Note

You can optionally use LANG variable to setup QtCreator language.

Old qt 3.0 guide: http://doc.trolltech.com/3.0/qmake-guide.html
How to configure enviroment: http://doc.qt.nokia.com/4.0/qmake-environment-reference.html

Qt qmake enhancement – how to generate structure VS project

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The problem

One of big disadvantage when creating Visual studio project from .pro files using qmake is missing support for hierachical folders. All files are stored in in four folders (filters) named “Source Files”, “Header Files”, “Generated Files” and “Form Files”. When you have large project, this arrangement is really hard to use.

Simple Solution

qmake has undocumented setting parameter “flat”. Using this switch, you can tell qmake to create filters in Visual studio dependent to directory structures of files. Only drawback of this solution is continuing sorting to “Source files”,”Header files”,…

So result of this solution will look like this:

To achieve this behaviour, only thing what have to be done is add following line to your .pro file:

CONFIG -= flat

Final solution

But what to do when you want to have all files stored together in structure dependent on directory structure? Only solution which I found is update qmake project for myself. This update is simply and here is what is need to be done:

Add new method initHeaderAndSourceFiles to file msvc_vcproj.cpp and .h with following content

void VcprojGenerator::initHeaderAndSourceFiles()
{
	vcProject.SourceFiles.Name = "Source And Header Files";
	vcProject.SourceFiles.Filter = "cpp;c;cxx;def;odl;idl;hpj;bat;asm;asmx;h;hpp;hxx;hm;inl;inc;xsd";
	vcProject.SourceFiles.Guid = _GUIDSourceFiles;

	vcProject.SourceFiles.addFiles(project->values("HEADERS"));
	vcProject.SourceFiles.addFiles(project->values("SOURCES"));
	if (usePCH) // Generated PCH cpp file
		vcProject.HeaderFiles.addFile(precompH);

	vcProject.SourceFiles.Project = this;
	vcProject.SourceFiles.Config = &(vcProject.Configuration);
	vcProject.SourceFiles.CustomBuild = none;
}

and update method VcprojGenerator::initProject() in msvc_vcproj.cpp file. Replace following two lines (currently located on line 762)

initSourceFiles();
initHeaderFiles();

with following code:

if ( project->isActiveConfig("grouped") == false ) {
	initSourceFiles();
	initHeaderFiles();
}
else {
	initHeaderAndSourceFiles();
}

Now you can add new flag “grouped” to your .pro file. After that, source and header files will be merged in the visual studio project tree.

CONFIG -= flat
CONFIG += grouped

And here is result screenshot:

First Qt attempts – qmake troubles

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External links

qmake documentation: qmake tutorial.html
qmake variables: qmake variable reference

Generate vcproj from .pro file

Command line for generating Visual studio project file from Qt .pro file.

qmake -tp vc test.pro

Missing moc_*.cpp file

When some of moc file isn’t properly generated and getting following error:

c1xx : fatal error C1083: Cannot open source file: '.\debug\moc_xxx.cpp': No such file or directory

try following:
Select corresponding .h file (for moc_xxx.cpp select xxx.h) in a project tree and select Compile from context menu. If the file is marked as “up-to-date“, try to change something in this file and repeat a compilation. If in the output window will be “up-to-date” again, you found a problem.

Use context menu on the corresponding .h file, select properties and edit “Configuration properties |Custom build steps|General|Outputs” to any value (add some char to the end of value), confirm change by Ok button and then return value back to original (remove added char). After that, compilation on correspond file will be successfully performed.

Linux relevant tips

List of known issues and tips

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This is list of all known issues and problems which we had to solve during our first Qt installation on Linux, Windows and Mac.

Known errors

Error: undefined interface

What to do when compilation of QT crash with message “Error: undefined interface”.
http://www.qtforum.org/article/31561/error-when-building-libraries.html
http://www.qtcentre.org/threads/26245-Qt-4.6-api/qscriptextensionplugin.h(43)-Error-Undefined-interface

make: g++: Command not found

it’s necessary to instal g++ support (sudo apt-get install g+)

Basic XLib functionality test failed!

it’s necessary to instal xlib(xorg??) support (sudo apt-get install xorg-dev)

*** [sub-corelib-make_default-ordered] Error 2

Probably mishmash on 32bit / 64bit  system and QT versions.

undefined reference to `QEventDispatcherGlib::versionSupported()’

Probably missing libglib2.0-dev on your system. (sudo apt-get install libglib2.0-dev).

Undefined reference to QSslSocket::*

Missing OpenSSL library on your system. (sudo apt-get install libssl-dev)

gtk/gtk.h: No such file or directory

Missing gtk package. (sudo apt-get install libgtk2.0-dev ). After that its necessary to update db (sudo updatedb).

if system can’t find file gtk/gtk.h because gtk is stored in gtk-2.0 directory, add -I (capitalised i) param to configure with gtk path:

./configure -opensource -I /usr/include/gtk-2.0

cups/cups.h: No such file or directory

install libcups2. (sudo apt-get install libcups2-dev)

gst/gst.h: No such file or directory

install gstreamer 0.10. (sudo apt-get install libgstreamer0.10-dev)

Missing Include/glibconfig.h

it’s because this file isn’t in /usr/include/glib-2.0, but in /usr/lib/glib-2.0. So you have to include also this /usr/lib path or copy file to include/glib-2.0

Hints and tips

How to create symbolic link to directory

create symbolic link using ln -nsf /usr/include/gtk-2.0/gtk /usr/include/gtk

Minimal required libraries

List of libraries required by Qt:

  • libfontconfig1-dev
  • libfreetype6-dev
  • libx11-dev
  • libxcursor-dev
  • libxext-dev
  • libxfixes-dev
  • libxft-dev
  • libxi-dev
  • libxrandr-dev
  • libxrender-dev

And other which are required by some modules of Qt:

To install all required on Linux, use following commands

sudo apt-get install libfontconfig1-dev libfreetype6-dev libx11-dev libxcursor-dev libxext-dev libxfixes-dev libxcups/cups.h: No such file or directory ft-dev libxi-dev libxrandr-dev libxrender-dev

sudo apt-get install bison flex libqt4-dev libqt4-opengl-dev libphonon-dev libicu-dev libsqlite3-dev libxext-dev libxrender-dev gperf libfontconfig1-dev libphonon-dev

If error doesn’t disappear after installing correct library

Sometimes it’s necessary to reconfigure Qt using make confclean

How to find where is missing header file located on disk

Use find /path -iname xxx.h command

How to find package which contains missing header file

use apt-file application with following syntax:

apt-file search gdk/gdk.h

Useful links about instalation Qt on linux

List of links about installation:
Building Qt on Linux

Qt configuration for succesfull build

This is currently my latest configure command to compile Qt on my Ubuntu 10.10.

Compilation fixes

This is necessary when search path for following libraries isn’t entered to configure.

sudo ln -nsf /usr/include/gstreamer-0.10/gst /usr/include/gst

Todo

Figure out how works pkg-config (pkg-config –cflags gstreamer-0.10)

Qt installation and configuration

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This is our company step-by-step guide to install and configure Qt on our developer machines.

How to install Qt

Link to Qt download site: http://qt.nokia.com/downloads

Windows (VS2005)

Download VS 2008 distribution from download site. When 2008 distribution is downloaded, it’s necessary to reconfigure and rebuild it for VS 2005 using next steps.

Linux

Download linux/x11 distro from Qt page. Download 32/64bit distro package. Setup downloaded files as executables:

chmod +x qt-sdk-linux-x86-opensource-2009.01.bin
chmod +x qt-creator-linux-x86-opensource-1.0.0.bin

Install Qt sdk to default directory and begin with configuration.

MacOS

Download latest Qt SDK distribution and latest XCode developer pack from apple site. Then install both.

How to configure Qt

Qt configuration is done via Configure script/executable on all platforms.

Windows

Run “Start menu->Visual studio->Tools-> Visual studio command prompt”
Then go to “c:\Qt\Qt_Version\Qt” and run “configure” with additional params.

Our current configuration:

configure -debug-and-release -opensource -shared -platform win32-msvc2005 -incredibuild-xge -openssl

Clean configurations

run nmake confclean and nmake distclean to remove all previous version of QT compilations.

SSL support

For SSL Support add -openssl switch to configure.

Note!

: configure param HAVE TO be executed from Visual studio command prompt!

Linux

Enter Qt directory and enter following configure param:

./configure -opensource -I /usr/include/gtk-2.0 -L /usr/lib/gt-2.0 -I  /usr/include/gstreamer-0.10 -L /usr/lib/gstreamer-0.10 -I /usr/include/glib-2.0 -L /usr/lib/glib-2.0 -I /usr/include/libxml2 -fast

Clean configurations

run make confclean and then configure.

MacOS

How to compile Qt

Windows

Compile Qt using command prompt:

  • Run Visual studio command prompt.
  • And run nmake to build a whole library

Second option is open projects.sln located in p:/Qt/4.7.1/ using Visual Studio IDE  and compile it.

Linux

  • As first thing, use configure to setup Qt settings.
  • As next, run make to build a whole library
  • After a while when everything is compiled, use make install. This will install library to /usr/local/Trolltech/Qt-4.7.0

MacOS

Currently not tested, using default compilation.

How to compile application

When we have prepared Qt library, it’s time to compile our application.

MacOS

When using  qmake without additional params, qmake generate xcode project from .pro instad makefile for g++. To generate makefile, use following params:

qmake -spec macx-g++
make

Deploying application

Windows

Not testes.

External link: http://doc.trolltech.com/4.5/deployment-windows.html

Linux

Not testes.

MacOS

Not testes.