Re: building a qt library

[Lorenzo Bettini]

Craig Sanders wrote:
> Lorenzo Bettini <address@hidden> wrote:> 
> > Craig Sanders wrote:
> > > Greetings Lorenzo.
> > >
> > > I have used the GNU Autotools in the past to build some simple
> > > projects which made use of the Qt Library. I prefer to use the GNU
> > > Autotools as I find them much more flexible and much more powerful than
> > > qmake.
> > >
> > > As I recall, there are 2 key steps that need to be performed when
> > > using the GNU Autotools with Qt.
> > >
> > > Step 1, You will need to get hold of an Autoconf macro which will
> > > detect if and if so, where you have a Qt Library installed on your
> > > system. If this macro detects that you have a Qt Library installed on
> > > your system, then it will generate some appropriate settings for you.
> > >
> > > Step 2, You will also need to instruct the Autotools how to invoke
> > > the Qt moc (Meta Object Compiler) on your relevant source code files.
> > >
> > > To accomplish the first step, you should be able to find an
> > > appropriate Autoconf macro here ;
> > >
> > >   http://autoconf-archive.cryp.to/macros-by-category.html
> > >
> > > Personally, I use the macro bnv_have_qt - information about which can
> > > be found here ;
> > >
> > >   http://autoconf-archive.cryp.to/bnv_have_qt.html
> > >
> > > I then call this macro from my configure.ac file as is illustrated
> > > below.
> > <SNIP>
> >
> > Hi Craig
> >
> > thanks a lot for your answer!
> >
> > I've just tried this macro on a brand new empty project...  I'm testing
> > it under windows with cygwin, and it seems to fail: I run configure like
> > this
> >
> > ./configure --with-Qt-lib-dir=/usr/lib/qt3/lib/
> > --with-Qt-include-dir=/usr/include/qt3/
> > --with-Qt-bin-dir=/usr/lib/qt3/bin/ --with-Qt-lib=qt
> >
> > and I get
> >
> > checking for Qt... yes:
> >      QT_CXXFLAGS=-I/usr/include/qt3/
> >      QT_DIR=
> >      QT_LIBS=-L/usr/lib/qt3/lib/ -lqt  -lSM -lICE  -lX11 -lXext -lXmu
> > -lXt -lXi
> >      QT_UIC=/usr/lib/qt3/bin//uic
> >      QT_MOC=/usr/lib/qt3/bin//moc
> >      QT_LRELEASE=/usr/lib/qt3/bin//lrelease
> >      QT_LUPDATE=/usr/lib/qt3/bin//lupdate
> > checking correct functioning of Qt installation... failure
> > configure: error: Failed to find matching components of a complete
> >                    Qt installation. Try using more options,
> >                    see ./configure --help.
> >
> > Actually, the link phase of the test example fails...  have you even
> > tried your project under cygwin?
> >
> > cheers
> >         Lorenzo
>
> Hello again Lorenzo.

Hi Craig

> I haven't tried configuring and building my Qt project using Cygwin under 
> Windows. Rather, I have only configured and built it under Linux Fedora Core 2 
> and using the default Qt installation (version 3.3) that is distributed with it.
>
> If I invoke the following switch ;
>
>   --with-Qt-dir

I used this switch too, actually I used the more complete form 
(otherwise headers and libraries would not be found at all)

> when I run the configure script, then my project successfully configures and 
> compiles. This has always worked for me, so I haven't bothered to try using any 
> of the other Qt related configure script switches, i.e. --with-Qt-lib-dir, etc.
>
> You could maybe try using this approach, and if you find that it doesn't work 
> for you then you could perhaps send an e-mail to the author of the bnv_have_qt 
> macro. I don't use Windows for software development, so I'm not sure what you 
> would need to do in order to get the bnv_have_qt macro to find your Qt 
> installation using just this one configure script switch. Sorry I can't be of 
> more any more help.

as I said, libraries and headers (and also tools) are correctly found, 
but it does not seem to succeed in the linking phase (of the configure 
test)... with a qmake project and makefile instead it seems to work...

I've already emailed to the author as well :-)

I don't develop under windows either (using Linux instead), but I always 
port my programs in windows using cygwin, that's why I was concerned...

Under linux that macro works perfectly...

I was also thinking of using the pkg-config approach, since qt ships the 
.pc files

> Good luck with it.

thanks!
hope to have some good news soon :-)

cheers
        Lorenzo

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Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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