can't debug mfc program

[Guilherme Kunz]

Hi! 

I am trying compile a mfc program with winelib. 

Well, i compiled the part of mfc which i need for use the program whitout 
erros or unresolved 
functions and compiled the mfc program with the libmfc.so without errors or 
unresolved functions, 
but when i ran the mfc program hapned "Segmentation Fault". 

I tried use gdb and winedbg but i can't run these debuggers, with gdb 
happned 
"Segmentation Fault" with or without breakpoints in the begining of the 
source and winedbg 
write only the first line in the window and go out. 

i tried use strace and "--debugmsg +all". 
HeapAlloc 
HeapAlloc 
*killed* exit_code=0 

#./program 
#Segmentation fault (core dump) 
#gdb program core 
#Reading symbols /usr/local/lib/libntdll.so ...... Segmentation fault (core 
dump) 

Thank You 

Guilherme 
guiok(a)ig.com.br 

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[Francois Gouget]

On Tue, 2 Oct 2001, Guilherme Kunz wrote:
> Hi!
>
> I am trying compile a mfc program with winelib.
>
> Well, i compiled the part of mfc which i need for use the program
> whitout erros or unresolved functions and compiled the mfc program
> with the libmfc.so without errors or unresolved functions, but when
> i ran the mfc program hapned "Segmentation Fault".
>
> I tried use gdb and winedbg but i can't run these debuggers, with
> gdb happned "Segmentation Fault" with or without breakpoints in the
> begining of the source and winedbg write only the first line in the
> window and go out.

Which C++ compiler did you use?
   With too old compiler (or the wrong options) the layout of your COM
virtual tables is probably wrong (though I'm not sure the execution got
that far).
   With a more recent compiler (gcc 2.96+), the C++ ABI is not supported
by either gdb or winedbg so that no debugger is usable to debug. Well,
at least you cannot put breakpoints on methods, view objects and things
many other tihngs like that. You can still put breakpoints at a specific
file line it seems.

   Also, which kernel are you using? >2.4.9+ or <2.4.5? ptrace sometimes
fails for seemingly no reason on 2.4.9, works fine in 2.4.5. But
normally all you get is a "cannot attach" or something like that.
> i tried use strace and "--debugmsg +all". 
> HeapAlloc 
> HeapAlloc 
> *killed* exit_code=0
>
> #./program 
> #Segmentation fault (core dump) 
> #gdb program core 
> #Reading symbols /usr/local/lib/libntdll.so ...... Segmentation fault (core 
> dump)

Hmmm, traces are your friends. Lots of traces. Starting with the
application's wrapper. But you will need to put some in the MFC too.
Probably starting with dllmodul.cpp (contains DllMain) and appcore.cpp
(also invoked during init).



--
Francois Gouget         fgouget(a)free.fr        http://fgouget.free.fr/
                         Stolen from an Internet user:
              "f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng !"

[eric pouech]

> winedbg 
> write only the first line in the window and go out.
> what does it write exactly ?
> A+
> --

Eric Pouech (http://perso.wanadoo.fr/eric.pouech/)
"The future will be better tomorrow", Vice President Dan Quayle

[Aric Stewart]

This appears to not just be mfc programs.. recently I have been unable
to use gdb on any wine program with either the 2.4.0 or 2.4.9 kernels.

same problems, i get a seg fault when loading libntdll.so

-aric

Guilherme Kunz wrote:
> Hi!
>
> I am trying compile a mfc program with winelib.
>
> Well, i compiled the part of mfc which i need for use the program whitout
> erros or unresolved
> functions and compiled the mfc program with the libmfc.so without errors or
> unresolved functions,
> but when i ran the mfc program hapned "Segmentation Fault".
>
> I tried use gdb and winedbg but i can't run these debuggers, with gdb
> happned
> "Segmentation Fault" with or without breakpoints in the begining of the
> source and winedbg
> write only the first line in the window and go out.
>
> i tried use strace and "--debugmsg +all".
> HeapAlloc
> HeapAlloc
> *killed* exit_code=0
>
> #./program
> #Segmentation fault (core dump)
> #gdb program core
> #Reading symbols /usr/local/lib/libntdll.so ...... Segmentation fault (core
> dump)
>
> Thank You
>
> Guilherme
> guiok(a)ig.com.br
>
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> Então clique aqui: http://registro.ig.com.br/