Error while compiling

I don't know if you've already solved the problem, but I just saw this
message and thought I'd put it my two cents. (I'm on an Ubuntu machine). I
was actually not able to compile MuseScore with 5.6. It was awhile ago, so I
don't remember all the details (I think there was something that was
deprecated in 5.6) but when I downgraded to 5.5, I had no problems. Maybe
try that?



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FWIW, I had the same problem - undefined reference to QWindowSystemInterface::registerTouchDevice(QTouchDevice*) from libQtWebKit, version 5.3.  There is no libQtWebKit in version 5.6, so the build shouldn't have been trying to use it.  In my case, the problem was that for some reason, I still had an old version of CMakeLists.txt in my source folder even though I had, in theory, updated to the latest master.  Might have had something to do with the way QtCreator manages that file specially (it is the main "project" file), might have been operator error on my part.  But anyhow, pulling the lateast sources again fixed it and I was able to compile.  There is still a line in CMakeLists.txt that appears to use this library, but the line seems harmless.  I get no errors whether I delete that line or not.

Marc

On Mon, Apr 18, 2016 at 9:54 AM Lasconic <[hidden email]> wrote:

Hi jguo,

It was a few weeks that you tried. MuseScore master now requires Qt 5.6.

lasconic

2016-04-18 17:49 GMT+02:00 jguo <[hidden email]>:

I don't know if you've already solved the problem, but I just saw this
message and thought I'd put it my two cents. (I'm on an Ubuntu machine). I
was actually not able to compile MuseScore with 5.6. It was awhile ago, so I
don't remember all the details (I think there was something that was
deprecated in 5.6) but when I downgraded to 5.5, I had no problems. Maybe
try that?



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Hi Lasconic,

Oh man, I'm clearly very behind then. Sorry about the un-helpful answer. That also means I need to update my local repo, thanks for letting me know! Fingers crossed my code will work with the new master...

Thanks!

On Apr 18, 2016 11:54 AM, "Lasconic" <[hidden email]> wrote:

Hi jguo,

It was a few weeks that you tried. MuseScore master now requires Qt 5.6.

lasconic

2016-04-18 17:49 GMT+02:00 jguo <[hidden email]>:

I don't know if you've already solved the problem, but I just saw this
message and thought I'd put it my two cents. (I'm on an Ubuntu machine). I
was actually not able to compile MuseScore with 5.6. It was awhile ago, so I
don't remember all the details (I think there was something that was
deprecated in 5.6) but when I downgraded to 5.5, I had no problems. Maybe
try that?



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Sorry to revive this thread, but this is happening again to me. Background:
having just had an HD failure, I had to re-install and re-configure
everything. Looking ahead I installed the latest Qt, 5.8, which compiles
ver. 3.0 (aka master) perfectly. So far, so good.

Having to deal with 2.1 too, parallel to Qt 5.8, I also installed Qt 5.4 via
Qt own maintenance tool. It does compile everything, but it has problems
when linking the executable.

First of all, it seems unable to find some of its own libraries
(libicui18n.so.53 and libicuuc.so.53), which I solved via a suitable
LD_LIBRARY_LOAD environment variable.

Then, it complains about:

"libQt5WebKit.so.5.4.2: undefined reference to
`QWindowSystemInterface::registerTouchDevice(QTouchDevice*)'"

I have installed everything about 5.4 (except Android and source code). Note
that the class QWindowSystemInterface seems unknown to Qt own help system.

Just for info, my system is Linux Mint 17.3 with Mate desktop. Any advise is
welcome...



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Thanks for the reply, lasconic.


lasconic wrote
> Maybe you have another Qt installed by your system?

Sure I have: the Mint 17.3 distro comes with Qt 5.3. However it should not
matter, as Qt 5.4 and 5.8 are installed in my home and, for instance, while
using Qt 5.8, it finds everything it needs from its own code base.

Dealing with master AND 2.1 practically requires to have three Qt versions:
the one which ships with the distro, 5.4 for 2.1 and 5.6+ for master. What
am I supposed to do? Keeping the sources of master on one PC and the sources
of 2.1 on another?

Anyway, where this damn QWindowSystemInterface is supposed to be found? It
is not described anywhere in the Qt docs...

> See https://forums.gentoo.org/viewtopic-p-7864110.html

I did find this post, but it seems related with Gentoo specifics; it
basically says: "Don't mix Qt versions", and we already know we shouldn't,
but in some cases we are forced to do it anyway.

I'll try with some more spells and runes...



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Oh well, MY FAULT!

Cleaning more accurately before switching between versions of the MuseScore
sources DOES WORK!

(After almost a year of working only in Java, it is surprising how one
looses familiarity with details and how much hodgy-podgy C++ dev would
seem...)
____________________

Incidentally about cleaning, I followed the Qt Creator Method 2 described
here in the developer handbook
<https://musescore.org/en/developers-handbook/compilation/compile-instructions-linux-bsd-git#Qt-Creator-IDE---method-2>
and the "make uninstalldebug" clean step results in the following error(s):

Starting: "/usr/bin/make" uninstalldebug
cd build.debug \
        && xargs rm < install_manifest.txt \
        && if [ "TRUE" = "TRUE" ]; then \
             update-mime-database ""/usr/local"/share/mime"; \
             gtk-update-icon-cache -f -t ""/usr/local"/share/icons/hicolor"; \
           fi \
        && xargs ../build/rm-empty-dirs < install_manifest.txt \
        && rm install_manifest.txt
Directory '/usr/local/share/mime/packages' does not exist!
gtk-update-icon-cache: Failed to open file
/usr/local/share/icons/hicolor/.icon-theme.cache : No such file or directory
make: *** [uninstalldebug] Error 1

I resorted to disabling this clean step and using "make clean" only.
____________________

Lastly, which is the make argument to turn off PulseAudio support?

Simply using "BUILD_PULSEAUDIO=OFF" does not go through. I tried
"-DBUILD_PULSEAUDIO=OFF" and, of course, it raises an error ("/usr/bin/make:
invalid option -- 'D'").

Short of editing CMakeLists.txt, which would be detected by git, I am
resorting to manually modifying the build-debug/CMakeCache.txt file created
after the first compilation attempt fails (and, no, no way I turn back on
that PulseAudio evil on my machine...).




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