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* [Bug breakpoints/14588] New: Option-g-O0 bug
@ 2012-09-16  6:43 jiang30056284 at sina dot com
  2012-09-16  6:47 ` [Bug breakpoints/14588] " jiang30056284 at sina dot com
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: jiang30056284 at sina dot com @ 2012-09-16  6:43 UTC (permalink / raw)
  To: gdb-prs

http://sourceware.org/bugzilla/show_bug.cgi?id=14588

             Bug #: 14588
           Summary: Option-g-O0 bug
           Product: gdb
           Version: 7.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jiang30056284@sina.com
    Classification: Unclassified


//123.c
char macro_ptr=0;
void next(void)
{
redo:
    if (!macro_ptr)
    {    
        if (macro_ptr)
        {
            if (macro_ptr)
            {
                if (macro_ptr)
                {
                    goto redo;
                }
            }
        }
    }
    else
    {    
        goto redo;        
    }
}

int main()
{
    char a=0,b=9;
    next();
    b=a+b;
    return 0;
}

jiang@jiang:~$ gcc -o123 -g -O0 123.c
jiang@jiang:~$ gdb 123
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/jiang/123...done.
(gdb) break main 
Breakpoint 1 at 0x4004f4: file 123.c, line 28.
(gdb) run
Starting program: /home/jiang/123 

Breakpoint 1, main () at 123.c:28
28        char a=0,b=9;
(gdb) s
29        next();
(gdb) 
[Inferior 1 (process 2322) exited normally]
warning: Error removing breakpoint 0
warning: Error removing breakpoint 0
warning: Error removing breakpoint 0
(gdb)

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug breakpoints/14588] Option-g-O0 bug
  2012-09-16  6:43 [Bug breakpoints/14588] New: Option-g-O0 bug jiang30056284 at sina dot com
@ 2012-09-16  6:47 ` jiang30056284 at sina dot com
  2012-09-16  7:11 ` jan.kratochvil at redhat dot com
                   ` (3 subsequent siblings)
  4 siblings, 0 replies; 6+ messages in thread
From: jiang30056284 at sina dot com @ 2012-09-16  6:47 UTC (permalink / raw)
  To: gdb-prs

http://sourceware.org/bugzilla/show_bug.cgi?id=14588

jiang <jiang30056284 at sina dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64  GNU/Linux
               Host|                            |x86_64  GNU/Linux

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug breakpoints/14588] Option-g-O0 bug
  2012-09-16  6:43 [Bug breakpoints/14588] New: Option-g-O0 bug jiang30056284 at sina dot com
  2012-09-16  6:47 ` [Bug breakpoints/14588] " jiang30056284 at sina dot com
@ 2012-09-16  7:11 ` jan.kratochvil at redhat dot com
  2012-09-16  9:19 ` jiang30056284 at sina dot com
                   ` (2 subsequent siblings)
  4 siblings, 0 replies; 6+ messages in thread
From: jan.kratochvil at redhat dot com @ 2012-09-16  7:11 UTC (permalink / raw)
  To: gdb-prs

http://sourceware.org/bugzilla/show_bug.cgi?id=14588

Jan Kratochvil <jan.kratochvil at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |jan.kratochvil at redhat
                   |                            |dot com
         Resolution|                            |MOVED

--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2012-09-16 07:11:12 UTC ---
The line
  warning: Error removing breakpoint 0
is already fixed - GDB PR 13776.

The bug itself is GCC debug PR already tracked as:
  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52160

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug breakpoints/14588] Option-g-O0 bug
  2012-09-16  6:43 [Bug breakpoints/14588] New: Option-g-O0 bug jiang30056284 at sina dot com
  2012-09-16  6:47 ` [Bug breakpoints/14588] " jiang30056284 at sina dot com
  2012-09-16  7:11 ` jan.kratochvil at redhat dot com
@ 2012-09-16  9:19 ` jiang30056284 at sina dot com
  2012-09-17  4:32 ` jiang30056284 at sina dot com
  2012-09-17  5:32 ` jan.kratochvil at redhat dot com
  4 siblings, 0 replies; 6+ messages in thread
From: jiang30056284 at sina dot com @ 2012-09-16  9:19 UTC (permalink / raw)
  To: gdb-prs

http://sourceware.org/bugzilla/show_bug.cgi?id=14588

--- Comment #2 from jiang <jiang30056284 at sina dot com> 2012-09-16 09:19:10 UTC ---
In addition to the-O0 option, the other can enter the next ()

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug breakpoints/14588] Option-g-O0 bug
  2012-09-16  6:43 [Bug breakpoints/14588] New: Option-g-O0 bug jiang30056284 at sina dot com
                   ` (2 preceding siblings ...)
  2012-09-16  9:19 ` jiang30056284 at sina dot com
@ 2012-09-17  4:32 ` jiang30056284 at sina dot com
  2012-09-17  5:32 ` jan.kratochvil at redhat dot com
  4 siblings, 0 replies; 6+ messages in thread
From: jiang30056284 at sina dot com @ 2012-09-17  4:32 UTC (permalink / raw)
  To: gdb-prs

http://sourceware.org/bugzilla/show_bug.cgi?id=14588

--- Comment #3 from jiang <jiang30056284 at sina dot com> 2012-09-17 04:31:49 UTC ---
step in next() -g -O0 fail
step in next() -g -O1 or -g -O2,so,successful
Optimization options related
I hope you will attention to this bug

jiang@jiang:~$ gcc -o123 -g -O1 123.c
iang@jiang:~$ gdb 123
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/jiang/123...done.
(gdb) break main 
Breakpoint 1 at 0x4004c1: file 123.c, line 28.
(gdb) run
Starting program: /home/jiang/123 

Breakpoint 1, main () at 123.c:28
28        next();
(gdb) s
next () at 123.c:6
6        if (!macro_ptr)
(gdb) q
A debugging session is active.

    Inferior 1 [process 2307] will be killed.

Quit anyway? (y or n) y

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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [Bug breakpoints/14588] Option-g-O0 bug
  2012-09-16  6:43 [Bug breakpoints/14588] New: Option-g-O0 bug jiang30056284 at sina dot com
                   ` (3 preceding siblings ...)
  2012-09-17  4:32 ` jiang30056284 at sina dot com
@ 2012-09-17  5:32 ` jan.kratochvil at redhat dot com
  4 siblings, 0 replies; 6+ messages in thread
From: jan.kratochvil at redhat dot com @ 2012-09-17  5:32 UTC (permalink / raw)
  To: gdb-prs

http://sourceware.org/bugzilla/show_bug.cgi?id=14588

--- Comment #4 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2012-09-17 05:31:29 UTC ---
 * You may rather follow-up at the GCC bug above, this bug is off-topic for
GDB:
   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52160
 * That -O1+ works is nice but it is still a real bug that -O0 does not.
 * It is more clear to use 'gcc -S' or 'objdump -dl' examples than showing GDB.

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^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-09-17  5:32 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-09-16  6:43 [Bug breakpoints/14588] New: Option-g-O0 bug jiang30056284 at sina dot com
2012-09-16  6:47 ` [Bug breakpoints/14588] " jiang30056284 at sina dot com
2012-09-16  7:11 ` jan.kratochvil at redhat dot com
2012-09-16  9:19 ` jiang30056284 at sina dot com
2012-09-17  4:32 ` jiang30056284 at sina dot com
2012-09-17  5:32 ` jan.kratochvil at redhat dot com

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