[CMake] FindQt4 stubbornly finding Qt3

[Clinton Stimpson]

Zach Laine wrote:
> On Tue, May 19, 2009 at 9:11 AM, Andreas Pakulat <apaku at gmx.de> wrote:
>   
>> Thats what Clinton did, so how about trying exactly what he wrote?
>>     
>
> Ok, removing the two message() lines (which is exactly what Clinton
> wrote) produces:
>
> -- Found Qt-Version 4.3.5
> -- Configuring done
> -- Generating done
> -- Build files have been written to: /ldisk/localstorage/proj/cmake/qt_test
>
> I don't see how that helps, since I can't tell what library and
> include paths are being detected.
>
>   
>> In particular you could try without the QT_USE_FILE and see wether the
>> variables are different then.
>>     
>
> Ok, this:
>
> find_package(Qt4)
>
> message(${QT_LIBRARY_DIR}) # prints "/usr/lib"
> message(${QT_INCLUDE_DIR}) # prints "/usr/lib/qt3/include"
>
> produces this output:
>
> -- Found Qt-Version 4.3.5
> /usr/lib
> /usr/lib/qt3/include
> -- Configuring done
> -- Generating done
> -- Build files have been written to: /ldisk/localstorage/proj/cmake/qt_test
>
>   
>> If not the next step would be to start
>> putting message() calls into FindQt4.cmake in CMake's Modules/ directory to
>> find out why it uses the wrong qmake or wether maybe the qmake supplies the
>> wrong paths.
>>     
>
> The explicit path to qmake I was using in the original CMakeLists.txt
> in my original post was /usr/local/Trolltech/Qt-4.3.5/bin/qmake.
> This:
>
> /usr/local/Trolltech/Qt-4.3.5/bin/qmake -v
>
> yields this:
>
> QMake version 2.01a
> Using Qt version 4.3.5 in /usr/local/Trolltech/Qt-4.3.5/lib
>
> Another data point -- there was one qmake in my path for all the runs
> above, and in all the runs in my previous posts,
> /usr/lib/qt3/bin/qmake.  When I removed this qmake, nothing changed.
> In fact, now 'which qmake' reports there is no qmake in my path, and
> yet FindQt4 still sets the Qt include path to /usr/lib/qt3/include.
>
> As for debugging FindQt4.cmake, surely I'm not the only person ever to
> try to use FindQt4 with qt3-devel and qt4-devel, plus another
> user-installed Qt version.  If it's finding the wrong qmake, it's
> surely my fault for using it wrong, not the FindQt4.cmake file.  I'm
> just trying to figure out the script-fu necessary to get it to play
> nicely.
>
> Does anyone know what the magic incantation is?
>
>   
I have Qt3 and Qt4 on my machine too, and I don't have this kind of problem.

Maybe this'll help narrow down the problem.
Can you try this (unmodified), and with a clean build directory (I want 
to see it checking the C and C++ compiler too)?

===  CMakeLists.txt ===
find_package(Qt4)
message("qmake exec = ${QT_QMAKE_EXECUTABLE}")
message("qt inc = ${QT_INCLUDE_DIR}")
message("qt core inc = ${QT_QTCORE_INCLUDE_DIR}")
message("qt headers dir = ${QT_HEADERS_DIR}")
exec_program( ${QT_QMAKE_EXECUTABLE}
        ARGS "-query QT_INSTALL_HEADERS"
        OUTPUT_VARIABLE qt_header_dir )
message("qt header dir 2 = ${qt_header_dir}")
======