-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Yesterday I downloaded, compiled, and installed the
latest stable FlightGear, 0.9.1. Unfortunately, some
of the aircraft do not work. When doing "fgfs
--aircraft=shuttle", the program dies as soon as soon
as the cockpit view starts to pop up. I searched this
list, and found some advice someone had given someone
else about running the program with gdb and getting a
backtrace, and I have done so, and will now present my
results. I don't really know how to use the debugger
for much, so I'll mention everything I did, just in
case:
$ gdb ./fgfs (from the directory FlightGear is in, of
course; I installed it and some of the libraries it
requires in a toplevel /flightgear directory)
(gdb) run --aircraft=shuttle
...
tons of output that can be supplied if needed...
...
Start common FDM init
...initializing position...
FGJSBsim::set_Longitude: -2.13556
FGJSBsim::set_Latitude: 0.656448
cur alt (ft) = 0
FGJSBsim::set_Altitude: -0.000431126
lat (deg) = 37.6117
Terrain altitude: -0.00141445
...initializing ground elevation to -0.000431126ft...
...initializing sea-level radius...
lat = 37.6117 alt = -0.000431126
...initializing velocities...
FGJSBsim::set_V_calibrated_kts: 0
...initializing Euler angles...
FGJSBsim::set_Euler_Angles: 0, 0.0074002, 5.19934
End common FDM init
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 4089)]
SGPropertyNode::getDoubleValue (this=0x0) at
props.cxx:1117
1117 props.cxx: No such file or directory.
in props.cxx
(gdb) backtrace
#0 SGPropertyNode::getDoubleValue (this=0x0) at
props.cxx:1117
#1 0x0822fd3a in FGGain::Run (this=0x9891960) at
FGGain.cpp:136
#2 0x0816ecc4 in FGFCS::Run (this=0x90315a0) at
FGFCS.cpp:137
#3 0x08180762 in FGFDMExec::Run (this=0x8ddc130) at
FGFDMExec.cpp:369
#4 0x081807ca in FGFDMExec::RunIC (this=0x8ddc130) at
FGFDMExec.cpp:384
#5 0x08153167 in FGJSBsim::init (this=0x902b578) at
JSBSim.cxx:234
#6 0x08050d57 in fgUpdateTimeDepCalcs () at
main.cxx:909
#7 0x08051faf in fgMainLoop () at main.cxx:1177
#8 0x40090845 in idleWait () from
/usr/lib/libglut.so.3
#9 0x0805700a in main (argc=2, argv=0xbffff824) at
main.cxx:1823
#10 0x403963c1 in __libc_start_main () from
/lib/libc.so.6
While I don't really know how to use the debugger, I
do know C and C++, and it certainly appeared that
SGPropertyNode::getDoubleValue was getting called with
a NULL this pointer from FGGain::Run. I looked at the
code, and indeed there are two calls to getDoubleValue
in Run, both from pointers, so either InputNodes[0] or
ScheduledBy is NULL. According to head, line 136 is
"LookupVal = ScheduledBy->getDoubleValue();", so
ScheduledBy would appear to be the culprit to me. But
it's not only the shuttle that does this; for example,
using --aircraft=X15 results in the exact same output.
I don't think these are the only two aircraft that do
this either. If there's any more information I can
provide or another way for me to be helpful in
general, please let me know.
Tommy McDaniel
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)
iD8DBQE9/e3ZVB8FYP9YqDcRAkBeAJwNN30TOcN+mSFDV032VZUDUPiMsgCfS18z
RIoCX7oZ1MfVSHvzgIYm6l4=
=P9F7
-----END PGP SIGNATURE-----
__________________________________________________
Do you Yahoo!?
New DSL Internet Access from SBC & Yahoo!
http://sbc.yahoo.com
_______________________________________________
Flightgear-devel mailing list
[EMAIL PROTECTED]
http://mail.flightgear.org/mailman/listinfo/flightgear-devel
