Public bug reported:
It seems PortMidi is being compiled incorrectly.
PortMidi provides two libraries, libportmidi and libporttime. libportmidi uses
libporttime which means it should link against it, but it doesn't:
$ ldd /usr/lib/libportmidi.so
linux-gate.so.1 => (0xffffe000)
libasound.so.2 => /usr/lib/libasound.so.2 (0xb7ebb000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7d87000)
libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb7d60000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0xb7d5c000)
libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0xb7d49000)
/lib/ld-linux.so.2 (0x80000000)
When programming in C it may required to link against both libraries,
libporttime and libportmidi to use libportmidi, which is bad; but when
trying to use it from C# it gets even worse, because you never link
against the library, you just open and use it, so the application dies
with a missing symbol. Here's the interesting output:
Mono-INFO: DllImport attempting to load: 'portmidi'.
Mono-INFO: DllImport loading location: 'libportmidi.so'.
Mono-INFO: DllImport error loading library: '/usr/lib/libportmidi.so: undefined
symbol: Pt_Time'.
Mono-INFO: DllImport loading library: './libportmidi.so'.
Mono-INFO: DllImport error loading library './libportmidi.so: cannot open
shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'portmidi'.
Mono-INFO: DllImport error loading library 'portmidi.so: cannot open shared
object file: No such file or directory'.
Mono-INFO: DllImport loading location: 'libportmidi'.
Mono-INFO: DllImport error loading library: '/usr/lib/libportmidi.so: undefined
symbol: Pt_Time'.
Mono-INFO: DllImport loading library: './libportmidi'.
Mono-INFO: DllImport error loading library './libportmidi.so: cannot open
shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'libportmidi'.
Mono-INFO: DllImport error loading library '/usr/lib/libportmidi.so: undefined
symbol: Pt_Time'.
(bin/Debug/Score Reading Trainer.exe:9408): Mono-WARNING **: DllImport unable
to load library '/usr/lib/libportmidi.so: undefined symbol: Pt_Time'.
Mono-INFO: DllImport attempting to load: 'portmidi'.
Mono-INFO: DllImport loading location: 'libportmidi.so'.
Mono-INFO: DllImport error loading library: '/usr/lib/libportmidi.so: undefined
symbol: Pt_Time'.
Mono-INFO: DllImport loading library: './libportmidi.so'.
Mono-INFO: DllImport error loading library './libportmidi.so: cannot open
shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'portmidi'.
Mono-INFO: DllImport error loading library 'portmidi.so: cannot open shared
object file: No such file or directory'.
Mono-INFO: DllImport loading location: 'libportmidi'.
Mono-INFO: DllImport error loading library: '/usr/lib/libportmidi.so: undefined
symbol: Pt_Time'.
Mono-INFO: DllImport loading library: './libportmidi'.
Mono-INFO: DllImport error loading library './libportmidi.so: cannot open
shared object file: No such file or directory'.
Mono-INFO: DllImport loading: 'libportmidi'.
Mono-INFO: DllImport error loading library '/usr/lib/libportmidi.so: undefined
symbol: Pt_Time'.
(bin/Debug/Score Reading Trainer.exe:9408): Mono-WARNING **: DllImport
unable to load library '/usr/lib/libportmidi.so: undefined symbol:
Pt_Time'.
Unhandled Exception: System.DllNotFoundException: portmidi
at (wrapper managed-to-native) PortMidi.MidiStream:Pm_Initialize ()
at ScoreReadingTrainer.MainClass.Main (System.String[] args) [0x00000]
Take a look at the include files and you'll see Pt_Time is part of
libporttime.
Thank you.
** Affects: portmidi (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
PortMidi is incorrectly compiled
https://launchpad.net/bugs/93728
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