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RE: Am set up for debugging... what next.
- To: "'Robert Collins'" <robert dot collins at itdomain dot com dot au>, cygwin at cygwin dot com
- Subject: RE: Am set up for debugging... what next.
- From: Troy Noble <troy dot noble at channelpoint dot com>
- Date: Mon, 23 Apr 2001 17:55:49 -0600
did that. That got me further.
Now I'm able to get the debugger to start up, but not really. In my
stackdump file I see (my program is cygdebug.c, and it just simply
tries to strcat() a null pointer just so I can cause the debugger to kick
End of stack trace2734786 [main] cygdebug 1804
And a console window says:
c:\work\cygdebug>c:\cygwin\bin2\gdb.exe /work/cygdebug/cygdebug.exe 2172
However gdb never pops up a GUI window. Watching Task Manager reveals that
does start and then slowly grows up to 266,800KB used over the span of about
minute and then dumps out a stack dump of its own (gdb.exe.stackdump) and
exits. The stackdump looked useless, but I appended it below.
Been reading back through DJ Delorie's comments, and I'm not sure I
did this right... or even what he means by it:
"... you'll need to build a copy of gdb that uses a \"debug\"
version of cygwin, so as to avoid using the dll you're debugging."
Egor Duda said:
"... place known-working copy of cygwin1.dll and normal unmodified
copy of gdb.exe into x:\path\to\special\gdb\".
So which is the right approach?
I first tried with the current distribution copy of gdb.exe as well as
the current cygwin1-1.1.8-2.dll into this alternate directory I created,
but I always get the "memory 0x00000004 could not be read" thing that you
when you have two incompatible DLLs. Then I tried to build another DLL off
same sources as the debug-enabled DLL, this time without the
and the generated .dll file was still 4.7MB. Am now trying with
--enable-debugging=no to see if I can get that to build a DLL with no
Is that what DJ meant?
Would I then copy that DLL (current sources, but without the debug info)
the same directory with the unmodified gdb.exe? Do I need to still rebuild
gdb.exe again, and if so, do I need any special configure options when doing
Thanks for your help. Troy
Here's the contents of gdb.exe.stackdump:
Frame Function Args
025B5104 610494C9 (00000006, 000006B4, 025B52F8, 00000001)
025B5144 610494C9 (000006B4, 00000006, 025B5174, 610517E6)
025B5174 61049675 (000006B4, 00000006, 025B51B4, 6107DC4D)
025B5194 61085C8A (610900A0, 000006B4, 00000006, 6107DC4D)
025B51C4 6107A63C (610900A0, 00000006, 025B52F8, 610786FE)
025B51E4 6107A611 (00000006, 025B52F8, 025B5224, 66001093)
025B5204 61076D14 (00000028, 00000000, 025B5584, 6636B06D)
025B5224 660010AC (66007D98, 00000028, 025B5264, 66007DC8)
025B5254 66007DE3 (00000028, 0046108D, 025B52A4, 6636C5EB)
025B52A4 6636C5F8 (025B5334, 025B52F8, 025B5344, 663685D5)
025B5344 663685E2 (0A729FC8, 0A02F4E0, 0000000E, 025B55A4)
025B53B4 0046196B (025B5584, 6120A545, 00596170, 00461EA9)
025B5424 00461EBB (610C662C, 77FC4A00, 00000000, 025B5584)
025B58A4 00461473 (004610B0, 0A02F4E0, 00000006, 0A030298)
025B58D4 0045EA4F (025B5A34, 00000000, 025B59F4, 004875B4)
025B59F4 004875EE (0045EA34, 025B5A34, 0045E8F8, 00000006)
End of stack trace (more stack frames may be present).../cyg
From: Robert Collins [mailto:firstname.lastname@example.org]
Sent: Monday, April 23, 2001 4:14 PM
To: Troy Noble; email@example.com
Subject: Re: Am set up for debugging... what next.
----- Original Message -----
From: "Troy Noble" <firstname.lastname@example.org>
Sent: Tuesday, April 24, 2001 7:56 AM
Subject: Am set up for debugging... what next.
> - created a /gdb-working/startup_gdb.cmd that reads:
> set CYGWIN_TESTING=1
> set PATH=c:\gdb-working;%PATH%
> c:\gdb-working\gdb.exe %1 %2
> - in my .basrhc I set:
> export CYGWIN='error_start=c:\gdb-working\start_gdb.cmd'
> and started a new bash window of course, echo $CYGWIN
> looks right.
Here's your problem: CYGWIN environment variable changes only affect
CYGWIN if they are set _before_ cygwinstarts.
If you're on NT, set cygwin via the system control panel or the .bat or
.cmd file that runs cygwin. If you run any cygwin daemons/services use
the system control panel. For 16 bit ^H^H^H^H^H^Hwin9x platforms set it
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