X-Recipient: archive-cygwin AT delorie DOT com X-Spam-Check-By: sourceware.org To: cygwin AT cygwin DOT com From: Ray Hurst Subject: Issue with GDB under Cygwin and XP Date: Mon, 11 Feb 2008 20:06:07 -0800 Lines: 88 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit User-Agent: Thunderbird 2.0.0.9 (Windows/20071031) X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com I'm running under Windows XP and Cygwin. I ran GDB on a simple C program and captured the output (below). I have a few questions: Why can I run the program several times with no errors but as soon as I set a breakpoint at main it gets a SIGSEGV fault? Why does the backtrace show only addresses? C:\Documents and Settings\Ray Hurst\workspace\CDT\HelloWorld-ANSIC\Debug>gdb Hel loWorld-ANSIC.exe GNU gdb 6.5.50.20060706-cvs (cygwin-special) Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-cygwin"... (gdb) list 5 Version : 6 Copyright : Your copyright notice 7 Description : Hello World in C, Ansi-style 8 ======================================================================= ===== 9 */ 10 11 #include 12 #include 13 14 int main(void) { (gdb) list 20 15 puts("!!!Hello World!!!"); /* prints !!!Hello World!!! */ 16 return EXIT_SUCCESS; 17 } (gdb) run Starting program: /cygdrive/c/Documents and Settings/Ray Hurst/workspace/CDT/Hel loWorld-ANSIC/Debug/HelloWorld-ANSIC.exe Loaded symbols for /cygdrive/c/WINDOWS/system32/ntdll.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/kernel32.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/cygwin1.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/advapi32.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/rpcrt4.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/secur32.dll !!!Hello World!!! Program exited normally. (gdb) run Starting program: /cygdrive/c/Documents and Settings/Ray Hurst/workspace/CDT/Hel loWorld-ANSIC/Debug/HelloWorld-ANSIC.exe Loaded symbols for /cygdrive/c/WINDOWS/system32/ntdll.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/kernel32.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/cygwin1.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/advapi32.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/rpcrt4.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/secur32.dll !!!Hello World!!! Program exited normally. (gdb) b main Breakpoint 1 at 0x401050: file ../src/HelloWorld-ANSIC.c, line 14. (gdb) run Starting program: /cygdrive/c/Documents and Settings/Ray Hurst/workspace/CDT/Hel loWorld-ANSIC/Debug/HelloWorld-ANSIC.exe Loaded symbols for /cygdrive/c/WINDOWS/system32/ntdll.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/kernel32.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/cygwin1.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/advapi32.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/rpcrt4.dll Loaded symbols for /cygdrive/c/WINDOWS/system32/secur32.dll Program received signal SIGSEGV, Segmentation fault. [Switching to thread 4896.0x1314] 0x000007f4 in ?? () (gdb) bt #0 0x000007f4 in ?? () #1 0x00000000 in ?? () (gdb) Ray -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/