openmotif, .rdata, shared libs and runtime linking/loading problem

["Avi Cohen Stuart" <avics at xs4all dot nl>]

Hi,

Please let me know if this is the correct newsgroup.

I'm trying to get openmotif to run under cygwin. I know that I'm not
supposed to do that but, who knows, maybe they change the license one of
these days :-)

The test I'm using is the hello.c from chapter 2 of the motif examples.

During the link I get these messages, I don't know if they are relevant.
gcc  -Wl,--script,/usr/lib/ldscripts/i386pe.x-no-rdata -ggdb3 -O2 -fno-strength-reduce
 -Wall -Wpointer-arith     -I/usr/X11R6/include    -D__i386__ -DWIN32_LEAN_AND_MEAN
 -DX_LOCALE                              -D_X86_ -D__CYGWIN__ -D_XOPEN_SOURCE
                             -D_POSIX_C_SOURCE=199309L -D_BSD_SOURCE
                         -D_SVID_SOURCE -D_GNU_SOURCE -DFD_SETSIZE=256
                     -DXResExtension  -DFUNCPROTO=15 -DNARROWPROTO
hello.c    -L/usr/X11R6/lib -lXm -lXt -lSM -lICE -lX11  -o hello
hello.c:8: warning: return type defaults to `int'
hello.c: In function `main':
hello.c:30: warning: control reaches end of non-void function
Info: resolving _sessionShellWidgetClass by linking to
__imp__sessionShellWidgetClass (auto-import)
Info: resolving __XmStrings by linking to __imp___XmStrings (auto-import)



The problem I'm having is that any app linked with the new shared library
I'm getting an error 0xc0000005 during the loading of the shared libraries,
before I even enter main().
gdb reports the following:


Program received signal SIGSEGV, Segmentation fault.

Program received signal SIGSEGV, Segmentation fault.

Program received signal SIGSEGV, Segmentation fault.

Program exited with code 030000000005.
You can't do that without a process to debug.
(gdb)

When using windbg it reports a access violation here, apperantly during the
resolving of shared libaries.
The address it is trying to write to appears to be a read only address in 
the attempt to resolve some adresses and updating pointers it crashes.

This is the stack trace I found with windbg.
 # ChildEBP RetAddr
00 0022f6bc 7c91d690 ntdll!LdrpSnapThunk+0xe1
01 0022f740 7c91d9cb ntdll!LdrpSnapIAT+0x20e
02 0022f76c 7c91d944 ntdll!LdrpHandleOneOldFormatImportDescriptor+0xcc
03 0022f784 7c91c8a6 ntdll!LdrpHandleOldFormatImportDescriptors+0x1f
04 0022f800 7c91de96 ntdll!LdrpWalkImportDescriptor+0x19e
05 0022fa50 7c91d99d ntdll!LdrpLoadImportModule+0x1c8
06 0022fa80 7c91d944 ntdll!LdrpHandleOneOldFormatImportDescriptor+0x5e
07 0022fa98 7c91c8a6 ntdll!LdrpHandleOldFormatImportDescriptors+0x1f
08 0022fb14 7c922370 ntdll!LdrpWalkImportDescriptor+0x19e
09 0022fc94 7c921639 ntdll!LdrpInitializeProcess+0xe02
0a 0022fd1c 7c90eac7 ntdll!_LdrpInitialize+0x183
0b 00000000 00000000 ntdll!KiUserApcDispatcher+0x7

I'm using the following command to link the shared libray for Xm (extracted 
from libtool output)

gcc -shared -Wl,--enable-auto-import -Wl,--enable-runtime-pseudo-reloc -Wl,--exclude-libs,ALL
 -Wl,--out-implib,.libs/libXm.dll.a
.libs/*.o  -L/usr/X11R6/lib -lXmu -lXt -lXext -lXp -lX11 -lSM -lICE -o
.libs/cygXm-4.dll

I've read these links: http://www.cygwin.com/ml/cygwin/2004-10/msg01052.html
http://www.cygwin.com/ml/cygwin/2004-09/msg01101.html
http://www.cygwin.com/ml/cygwin-apps/2004-09/msg00309.html
and I've tried the linker scripts but it doesn't solve the problem as I'm 
suspecting that a lot of the static declared stuff is not (always) 
initialized.

What I am I doing wrong? Or where should I look? Is it a linker/libtool 
issue
(Besides compiling openmotif on cygwin :-) )

Avi.


N.B. sorry for the repost. I suspect that a different subject draws more 
attention...




--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/