-------- Forwarded Message -------- > From: Robert Fu <[EMAIL PROTECTED]> > Reply-To: FlightGear user discussions > <[EMAIL PROTECTED]> > To: FlightGear user discussions > <[EMAIL PROTECTED]> > Subject: Re: [Flightgear-users] Nasal runtime error: non-scalar in > string context > Date: Sat, 22 Sep 2007 21:38:05 -0700 > > Hi Ron, > > Thanks a lot for your help. After spending a lot of hours, I think > that the following factors seems contributed to the crash: > > 1. OpenSceneGraph uses STL a lot, and some STL classes manage their > own memory. > 2. I verified on Linux, similar setup worked. Thus the Flightgear and > OpenSceneGraph code seems fine. > 3. In my previous MinGW, libstdc++ is a statically linked, and it's > based on static version of system C library MSVCRT. For .EXE or .DLL > modules which are statically-linked C Run-time library, problem can > occur in some situations, such as allocating memory with a C Run-time > call in the .EXE/DLL and reallocating or freeing it in the other > module. Each of these .EXE or .DLL has its own heap space. I think in > my case, allocating memory in one heap space, and freeing it in > another heap space eventually crashed the system. When tracing the > execution in Eclipse, I noticed that in some situations, after > exiting a function, it came back to execute the last few lines of the > same function again. The following are some links for someone > interested in details of this cross DLL/EXE issue: > > http://www.nabble.com/C > ++-STL,-DLLs-and-our-friend-RtlFreeHeap-t1847074.html > > http://mail-archives.apache.org/mod_mbox/xerces-c-dev/200004.mbox/% > [EMAIL PROTECTED] > > http://lists.trolltech.com/qt-interest/2004-12/thread00928-0.html > http://lists.trolltech.com/qt-interest/2001-10/thread00530-0.html > > http://support.microsoft.com/kb/140584 > http://support.microsoft.com/kb/94248 > > As suggested in the the above links, we need a DLL version of libstdc > ++ in MinGW. Fortunately in the latest preview version of gcc 4.2.1, > there is such a libstdc++. With some further steps like creating the > missing libgcc_s.a, etc, I finally made CVS version of Flightgear with > OpenSceneGraph worked with MinGW/MSYS on both Windows XP and Vista. > FGRun also worked with MinGW/MSYS. If anyone is interested in details, > please let me know. > > Thanks, > Robert Fu > > > On 9/11/07, Ron Jensen <[EMAIL PROTECTED]> wrote: > On Tue, 2007-09-11 at 09:37 -0700, Robert Fu wrote: > > Hi Ron, > > > > > So I set HOME environment variable, and the Nasal error > disappeared > > when running in DOS-Prompt. I noticed before that when > running in > > MSYS, I got different console output, and I realize now that > in MSYS, > > there is HOME environment variable. > > Cool :) > > > However, I got a different problem, and this time, there is > no error > > in console output. A Windows "Send Error Report" dialog came > up, after > > clicking on Don't Send button, fgfs application exited. When > I turned > > on log-level as the following > > > > fgfs --httpd=5500 --log-level=info > > > > There are a lot message output in console, and the last few > lines are: > > > > Adding subsystem nasal > > trying to load aircraft data from > > c:/gnu/depot/home/rfu/.fgfs/aircraft-data/c172p.xml (OK if > not found) > > Cannot load flight from > > c:/gnu/depot/home/rfu/.fgfs/aircraft-data/c172p.xml > > The above lines shouldn't be a problem as > ~/.fgfs/aircraft-data/c172p.xml doesn't exist here, either... > > > loading scenario 'aircraft_demo' > > Reading image "C:\gnu\msys\1.0.11\local\src\FlightGear-0.9 > \data > > \Aircraft\737-300\Models\733UAii.rgb" > > Reading model "C:/gnu/msys/1.0.11/local/src/FlightGear- > > 0.9/data/Aircraft/737-300/Models/737-300.ac" > > > > > > Splash screen progress setting up time & renderer > > > > > > If I click on Debug button on the Send Error Report dialog, > I got: > > > > unhandled exception in fgfs.exe:0xC0000005: Access > Violation. > > > > I guess something might not be loaded correctly, and I'll do > more > > tracing, and any advice is welcome. > > > Perhaps its not liking the aircraft demo? Try turning off > ai-models and > the traffic manager with this command line: > > fgfs --disable-ai-models --prop:/sim/traffic-manager/enabled=0 > > Or go into $FGROOT/preferences.xml and comment out the > aircraft-demo, it > should be around line 459. > > > > I have one question though: which version of pthread should > be used > > with the latest FlightGear? I used pthreads-w32 2.8.0, and > I'm not > > sure if it'll cause any problem. > > I have no idea, I'm not on windows. I believe I'm just using > the > pthreads built into libc6. > > You could try asking on IRC as well... > > Ron >
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