GCJ application runs not too bad with shared libs, but crashes with static libs

Wed Nov 20 16:10:00 GMT 2002

I'm working on an AWT application with libgcjx. I know that sounds
dangerous, but I've been able to hack the library enough to make it go,
since I'm using all custom components, and therefore only need Component,
Container, Frame and a few layouts.
The problem is that if I build it with "-static", it crashes a lot. Running
gdb with a breakpoint on "abort", it usually stops in __libc_write or
sigsuspend, sometimes right away, and sometimes after you bang at the
application for a while. Any little thing seems to change the result. For
example, I did "gdb mts5000.bin | tee gdb1.tmp", and the thing ran for about
10 minutes without crashing before I finally gave up. Redirecting the
output to /dev/null also seems to improve things. When I run the program on
my target embedded system, however, it always crashes within 20 seconds or
so of operation.
When I build gcc 3.2.1, I used the following configuration (then
hand-modified the Makefile as described in my earlier posting).
 ../gcc.orig/configure
 --prefix=/usr
 --mandir=/usr/share/man
 --infodir=/usr/share/info
 --enable-shared
 --enable-threads=posix
 --disable-checking
 --host=i386-redhat-linux
 --enable-java-awt=xlib
 --enable-libgcj
 --enable-languages=java
 --with-system-zlib
 --enable-__cxa_atexit
The shared-library version uses the following libraries (according to ldd):
 libgcjx.so.3 => /usr/lib/libgcjx.so.3 (0x4002f000)
 libX11.so.6 => /usr/X11R6/lib/libX11.so.6 (0x40060000)
 libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x4013e000)
 libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x401e8000)
 libgcj.so.3 => /usr/lib/libgcj.so.3 (0x401f0000)
 libm.so.6 => /lib/i686/libm.so.6 (0x407e2000)
 libpthread.so.0 => /lib/i686/libpthread.so.0 (0x40804000)
 libz.so.1 => /usr/lib/libz.so.1 (0x40835000)
 libdl.so.2 => /lib/libdl.so.2 (0x40843000)
 libc.so.6 => /lib/i686/libc.so.6 (0x42000000)
 libSM.so.6 => /usr/X11R6/lib/libSM.so.6 (0x40846000)
 libICE.so.6 => /usr/X11R6/lib/libICE.so.6 (0x4084f000)
 /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
Here are my compile and link commands:
gcj -O2 -c -o mts5000.o mts5000.jar
gcj --main=Main -g -o mts5000.bin -static -static-libgcc
./libgcjx.o -Dawt.toolkit=gnu.awt.xlib.XToolkit -L/usr/X11R6/lib -lX11 -lstd
c++ mts5000.o
Here is a typical debug output:
[root@mts5000dev1 java]# gdb mts5000.bin
GNU gdb Red Hat Linux (5.2.1-4)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
(gdb) set args PC
(gdb) break abort
Breakpoint 1 at 0x80a71ca: file ../../../gcc/libjava/exception.cc, line 29.
(gdb) run
Starting program: /home/scott/mts5000/java/mts5000.bin PC
... lots of application-generated stuff...
Program received signal SIGABRT, Aborted.
0x0817b8e4 in __libc_write ()
(gdb) where
#0 0x0817b8e4 in __libc_write ()
#1 0x00000018 in ?? ()
#2 0x081155ca in java::io::FileDescriptor::write(JArray<char>*, int, int)
(this=0x83cffc8, b=0x840edb8, offset=24,
 len=1) at java/io/natFileDescriptor.cc:164
#3 0x080ce147 in java.io.BufferedOutputStream.flush() (this=0x840a1c0)
 at ../../../gcc/libjava/java/io/BufferedOutputStream.java:141
#4 0x080cfc22 in java.io.PrintStream.flush() (this=0x83f3fa8) at
../../../gcc/libjava/java/io/PrintStream.java:57
#5 0x080cfcc6 in java.io.PrintStream.print(java.lang.String, boolean)
(this=0x83f3fa8, str=0x8580270, println=true)
 at ../../../gcc/libjava/java/io/PrintStream.java:77
#6 0x080d01a0 in java.io.PrintStream.println(java.lang.String)
(this=0x83f3fa8, str=0x8580270)
 at ../../../gcc/libjava/java/io/PrintStream.java:219
#7 0x0809a107 in
manta::mts5000::Main::dumpComponentContents(java::awt::Component*, int,
java::lang::String*) ()
#8 0x0809a279 in
manta::mts5000::Main::dumpComponentContents(java::awt::Component*, int,
java::lang::String*) ()
#9 0x0809a279 in
manta::mts5000::Main::dumpComponentContents(java::awt::Component*, int,
java::lang::String*) ()
#10 0x0809a279 in
manta::mts5000::Main::dumpComponentContents(java::awt::Component*, int,
java::lang::String*) ()
#11 0x08099fee in manta::mts5000::Main::Main(JArray<java::lang::String*>*)
()
#12 0x08099cc2 in manta::mts5000::Main::main(JArray<java::lang::String*>*)
()
#13 0x081151a2 in gnu::gcj::runtime::FirstThread::call_main()
(this=0x8410ea0)
 at ../../../gcc/libjava/gnu/gcj/runtime/natFirstThread.cc:46
#14 0x080c27d9 in _Jv_ThreadRun(java::lang::Thread*) (thread=0x8410ea0)
 at ../../../gcc/libjava/java/lang/natThread.cc:285
#15 0x0809e8c4 in _Jv_RunMain(java::lang::Class*, char const*, int, char
const**, bool) (klass=0x8279900, name=0x0,
 argc=2, argv=0x8410ea0, is_jar=false) at
../../../gcc/libjava/prims.cc:1010
#16 0x0809e9b4 in JvRunMain (klass=0x8279900, argc=2, argv=0xbffff954) at
../../../gcc/libjava/prims.cc:1020
#17 0x080481fd in main (argc=2, argv=0xbffff954) at /tmp/cc30GAd5.i:12
#18 0x0815b1aa in __libc_start_main ()
(gdb)
Any idea what's going on here?
Thanks.