On Friday 17 March 2006 03:00, Iain Duncan wrote:

> I tried building my own portmidi test app and it worked ok, so not sure
> what is wrong. The message I get from scons is:
> 
> scons: Building targets ...
> gcc -Wl,-Bdynamic -shared -o libpmidi.so InOut/pmidi.os -L. -L.
> -L/usr/local/lib64 -L. -L. -lsndfile -lportmidi -lporttime -lasoun d
> /usr/lib/gcc/x86_64-pc-linux-gnu/3.4.3/../../../../x86_64-pc-linux-gnu/bin/ld:
> /usr/lib/gcc/x86_64-pc-linux-gnu/3.4.3/../../../../
> lib64/libportmidi.a(portmidi.o): relocation R_X86_64_32 against `a local
> symbol' can not be used when making a shared object; reco mpile with -fPIC
> /usr/lib/gcc/x86_64-pc-linux-gnu/3.4.3/../../../../lib64/libportmidi.a:
> could not read symbols: Bad value

The libportmidi.a library was probably compiled without the option that
requests position independent code. This is needed by the Csound PortMidi
plugin which is a shared library, but not the static test app, that is
why the latter does not fail. The solution is to recompile PortMidi with
adding -fPIC to the compiler flags in the Makefile.

> As to using alsamidi, I don't seem to be having any luck with that
> either. What should I pass to -M when wanting to use the first alsa midi
> device on the system? I am getting the following output from csound when
> using -M0 or -M1:
> 
> ALSA lib rawmidi.c:283:(snd_rawmidi_open_noupdate) Unknown RawMidi 1
> ALSA: error opening MIDI input device
>  *** error opening MIDI in device: -1 (Unknown MIDI error)

For -+rtmidi=alsa, devices are specified as ALSA device names (similarly
to real time audio with -+rtaudio=alsa). For example, -M hw:1,0 would use
device #0 on card #1, assuming that it exists.


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