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From:	jojelino <jojelino AT gmail DOT com>
Subject:	Re: gdb bt gives many question marks
Date:	Thu, 14 Mar 2013 17:37:19 +0900
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On 2013-03-14 PM 4:37, Ken Huang wrote:
> Hi all,
>
> I have a problem when using gdb to debug my program in cygwin, the 'bt' command
> gives me many '??'.
> (gdb) bt full
> #0  0x7c92e514 in ntdll!LdrAccessResource () from
> /cygdrive/c/WINDOWS/system32/ntdll.dll
> No symbol table info available.
> #1  0x7c92df5a in ntdll!ZwWaitForSingleObject () from
> /cygdrive/c/WINDOWS/system32/ntdll.dll
> No symbol table info available.
> #2  0x7c8025db in WaitForSingleObjectEx () from
> /cygdrive/c/WINDOWS/system32/kernel32.dll
> No symbol table info available.
> #3  0x00000714 in ?? ()
> No symbol table info available.
> #4  0x00000000 in ?? ()
> No symbol table info available.
>
> My test program is as follows:
> void bar()
> {
>      abort();
> }
>
> void foo()
> {
>      bar();
> }
>
> int main()
> {
>      foo();
> }
>
> So, did I compile wrong, or is there something I didn't set properly?
>
> Thanks,
> Ken
>

There is no way of identifying stdcall or fastcall ABI for return 
address that are not annotated by DWARF contained in stack frames in 
current gdb. you'd better give up or come with patches that solved the 
problem.
-- 
Regards.


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