Re: [jazzplusplus-devel] configure.ac update -please test-

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> Date: Tue, 13 May 2008 05:41:08 +0000
> Subject: Re: [jazzplusplus-devel] configure.ac update -please test-
> 
>>> 
>> When you are debugging add --enable-debug to your configure line.
>> 
>> After you finish the build, run the code using gdb...
>> 
>> gdb jazz
>> 
>> Then type "run" when you get a prompt.  When the code crashes, generate 
>> a back trace using the "bt" command.  Full gdb documentation can be 
>> found at http://sourceware.org/gdb/current/onlinedocs/gdb_toc.html
>> 
>> Reply back with the result of the back trace.
>> 

I actually know about gdb, backtraces and so forth. I doubt one could
build a Free software based systems for as long as I have without needing this
'software scalpel' at some stage or another. However, I tend to 'follow the book'
very closely, as to expose 'userland', because sometimes that's a useful strategy.
So we see here...the configuration switch '--enable-debug' (which is part of
the current svn build instructions anyhow), and the quick gdb primer of how
to obtain useful debugging information to help developers out here.

I think somehow that for as long as a debug build is the default build, these
brief gdb instructions would be quite pertinent for users to read somewhere
on the website.  Test builders are a valuable resource, and so I believe it might
useful to include such documentation on the site so users who do build jazz++
can quickly and easily supply (and know how to create) useful information 
if they find their jazz++ build crashes. If nothing else, it'll save having to spell
that backtrace passage out, over and over again. Remember, everyone building
from svn is effectively a test builder at present.

Let me know what we think here - if it sounds like a good idea and we agree,
I'll edit the htdocs in some appropriate spot to include such instructions.  

>> It will be a while before I get to it.  Maybe not until this weekend.
>> 
>> Pete
>> 
> 
> Yep, no problem.... the back trace without vkeybd running but with
> jack/fluidsynth/qsynth running and ready to go (complete session);
> 
> (gdb) run
> Starting program: /root/Jazz++/TestInstall/bin/jazz 
> Failed to read a valid object file image from memory.
> [Thread debugging using libthread_db enabled]
> [New Thread 140090596853472 (LWP 3341)]
> JZProject::ReadConfiguration() ConfFileNameAndPath:
>   "/root/Jazz++/TestInstall/share/Jazz++/jazz.cfg"
> JZConfiguration::LoadConfig:
>   "/root/Jazz++/TestInstall/share/Jazz++/jazz.cfg"
> Include synthesizer configuration file "gs.jzi"
> FindFile: Immediate hit on file "gs.jzi"
> Include file "gsdrmset.jzi"
> FindFile: Immediate hit on file "gsdrmset.jzi"
> Include file "gmdrmnam.jzi"
> FindFile: Immediate hit on file "gmdrmnam.jzi"
> Include file "gsvoices.jzi"
> FindFile: Immediate hit on file "gsvoices.jzi"
> Include file "ctrlnam.jzi"
> FindFile: Immediate hit on file "ctrlnam.jzi"
> created client:port = 131:0
> invalid output device, so selecting one
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 140090596853472 (LWP 3341)]
> snd_seq_port_subscribe_set_sender (info=0x7fff6a45d310, addr=0x0) at seq.c:2432
> 2432            memcpy(&info->sender, addr, sizeof(*addr));
> Current language:  auto; currently c
> 
> (gdb) bt
> #0  snd_seq_port_subscribe_set_sender (info=0x7fff6a45d310, addr=0x0)
>     at seq.c:2432
> #1  0x0000000000426a59 in tAlsaPlayer::subscribe_inp (this=0xb68020, inp=0)
>     at ../../jazz/src/AlsaPlayer.cpp:219
> #2  0x0000000000427793 in tAlsaPlayer (this=0xb68020, song=0x7f69623ea010)
>     at ../../jazz/src/AlsaPlayer.cpp:122
> #3  0x0000000000423638 in tAlsaAudioPlayer (this=0xb68020, 
>     pSong=0x7f69623ea010) at ../../jazz/src/AlsaDriver.cpp:127
> #4  0x00000000004b9ed2 in JZProject (this=0x7f69623ea010)
>     at ../../jazz/src/Project.cpp:194
> #5  0x0000000000498948 in JZJazzPlusPlusApplication::OnInit (this=0xafe690)
>     at ../../jazz/src/JazzPlusPlusApplication.cpp:127
> #6  0x0000000000498d96 in wxAppConsole::CallOnInit (this=0xafe690)
>     at /usr/local/wx287/include/wx-2.8/wx/app.h:76
> #7  0x000000000079a70a in wxEntry ()
> #8  0x0000000000498d10 in main (argc=1, argv=0x7fff6a45dc68)
>     at ../../jazz/src/JazzPlusPlusApplication.cpp:63
> 

Just a further note on this -- as I mentioned in a previous posting, 
I'm keen to test out and document jazz++'s interoperability and setup
with other midi based applications on linux. Last night, I got around
to trying the AlsaModularSynth (AMS) application with jazz++.

To use AMS without a hardware midi/synth soundcard, relies on a
very similar setup to jack/fluidsynth/qsynth. One starts AMS with 
the --jack cmdline option, and when jazz++ is started and prompts
for an output device, the user selects the AMS output device entry.

Yes...it works, and curiously enough it never once spawned the above
crash in a two hour session of me mucking around with things, stopping
and restarting things...I could not seemingly reproduce this error above
using jack/AMS and jazz++ at all. Nor did it ever steal my mouse and
keyboard I hasten to add -- everything behaved itself.

I'm no coder, but I thought I'd mention this here, just in case there's
more to the above error than immediately meets the eye.

Regards,

Donald B 

> 
> 
> Hope this helps put some light on the issue.
> 
> 
> Regards,
> 
> Donald B
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