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Date:	Thu, 04 Oct 2007 13:10:07 +0200
From:	Alberto Luaces <aluaces AT udc DOT es>
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Subject:	Debugging with cygwin tools
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Hello,

I am just starting to learn how to use the debugging tools available in
Cygwin. To do so, I have a test program deliberately designed to crash:

#include <iostream>

int main()
{
         int *p=0;

         *p=9;

         return 0;
}

I have compiled it with debugging information:

g++ -g -O0 -o core core.cpp

Then I try to run it with gdb:

gdb core.exe

(gdb) b main
Breakpoint 1 at 0x401175: file core.cpp, line 4.
(gdb) r
Starting program: /home/Demostración/testsC++/core.exe
Error: dll starting at 0x77d41000 not found.
Segmentation fault (core dumped)

As seen, gdb crashes without even start the program.

Then, I am trying to get a core dump:

$ export CYGWIN=error_start=c:\\cygwin\\bin\\dumper.exe
$ ./core
*** starting debugger for pid 2664, tid 544

but the program 'dump.exe' never returns and no core file is generated.

My system is running WinXP-64. I have read on the archives that
dumper.exe should work correctly but it is not.

How can I finally debug my program?

Alberto



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