[SOLVED] Trouble building Musescore on Slackware 64

Captain Pinkeye · 03-18-2013, 04:51 PM

Hi, i tried to compile Musescore (sbopkg + mscore.Slackbuild), but it failed.

Build quits with:

Quote:

[ 84%] Building CXX object scriptgen/qtbindings/gui/CMakeFiles/qtscript_gui.dir/qtscriptshell_QDrag.cpp.o
Linking CXX shared library libqtscript_gui.so
make[3]: Leaving directory `/tmp/sbopkg.Mz0E69/mscore-1.2/build'
[ 84%] Built target qtscript_gui
make[2]: Leaving directory `/tmp/sbopkg.Mz0E69/mscore-1.2/build'
make[1]: Leaving directory `/tmp/sbopkg.Mz0E69/mscore-1.2/build'

But much further up there is this (and only) error:

Quote:

/usr/lib64/gcc/x86_64-slackware-linux/4.7.1/../../../../x86_64-slackware-linux/bin/ld: note: 'pthread_cancel@@GLIBC_2.2.5' is defined in DSO /lib64/libpthread.so.0 so try adding it to the linker command line
/lib64/libpthread.so.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make[3]: *** [mscore/mscore] Error 1
make[2]: *** [mscore/CMakeFiles/mscore.dir/all] Error 2
make[2]: *** Waiting for unfinished jobs....

So i did my homework, and it seems i need to add '/lib64/libpthread.so.0' to the linker command line, as it is written here:
http://forums.fedoraforum.org/showthread.php?t=247730, but i don't know how to do it and i don't want to bork my system. Plus my brain was starting to melt down, too.

So my question is:
1. How to succesfully build this package?
2. How to add something into linker command line, preferably using the slackbuild?

Tried to compile both 1.2 and 1.3, with -j3 and without any -j, with -02 and -01, on 64 bit Slackware 14, both optional deps (portaudio & jack) i have not.
The same slackbuild went fine on Slackware64 13.37.
(I tried to attach both logs, but i can't for some reason.)

ponce · 03-18-2013, 06:39 PM

This is a case of underlinking, so the solution is to pass the linker the specific library.
You forgot to post when it happens, the first line of the error

Code:

/usr/lib64/gcc/x86_64-slackware-linux/4.7.1/../../../../x86_64-slackware-linux/bin/ld: CMakeFiles/mscore.dir/alsa.cpp.o: undefined reference to symbol 'pthread_cancel@@GLIBC_2.2.5'

Normally, it's sufficient to pass the library with LDFLAGS="-lpthread" to configure, but in this case cmake is used so you have to hunt a little in the CMakeLists.txt of the project and sed in the additional library: I've looked around and seems you have to add this line to the slackbuild, just before the first make

Code:

# Fix linking
sed -i '/^\ \ \ \ \ \ \${ALSA_LIB}$/i\      pthread' mscore/mscore/CMakeLists.txt

have a look at the file in question and search for pthread (after sed has run) to see in which block is added.

Captain Pinkeye · 03-19-2013, 02:23 AM

Quote:

you have to add this line to the slackbuild, just before the first make

Code:

Quote:

# Fix linking
sed -i '/^\ \ \ \ \ \ \${ALSA_LIB}$/i\ pthread' mscore/mscore/CMakeLists.txt

I did just that, and yes, the package compiled succesfully and seems to be working well!

Thanks for your time and knowledge, i'll mark this as solved now.