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Subject:	Re: gdb bt gives many question marks
From:	Ken Huang <csuhgw AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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2013/3/14 jojelino <jojelino AT gmail DOT com>:
> 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.

So you mean gdb can't help to debug buggy code without patches? but as the
results I googled before, there are people out there use gdb just like in linux.

Do I need to install some external packages?

Regards,
Ken

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