VS 2010 Debugger breakpoint skips first iteration of for-loop

VS 2010 Debugger breakpoint skips first iteration of for-loop by DenisStack

Closed

as Fixed

Type:	Bug
ID:	713927
Opened:	12/14/2011 4:04:11 AM
Access Restriction:	Public
Moderator Decision:	Sent to Engineering Team for consideration

Workaround(s)

view

User(s) can reproduce this bug

If you set a breakpoint on the same line as the "for" statement, then run - to - breakpoint, debugger doesn't break until the loop has been iterated once.
This bug also exists in VS 2008.

Details (expand)

Visual Studio 2010

Run the following code in a win32 console application and set a breakpoint at the "for" statement. You will see that "bla" is already 1 at that point - the loop has been iterated once.

int _tmain(int argc, _TCHAR* argv[])
{
    int i = 0;
    int bla = 0;
    for (; i < 1; ++i)
    {
        bla = 1;
    }
}

English

Windows 7

English

bla = 1

bla = 0

0 attachments

Posted by DenisStack on 12/20/2011 at 3:01 AM

Thanks for the fix!
Denis

Posted by Microsoft on 12/19/2011 at 9:50 AM

We have found the root cause and fixed the problem. The fix will be included in our next major Visual Studio release.

The workaround for now is to use /Zi or /Z7 instead of /ZI, which can be set in project's property page, under "C/C++ | General | Debug Information Format".

Thanks a lot for the bug report.

YongKang Zhu
--
VC++ CodeGen and Tools

Posted by MS-Moderator09 [Feedback Moderator] on 12/14/2011 at 11:12 PM

Thank you for submitting feedback on Visual Studio 2010 and .NET Framework. Your issue has been routed to the appropriate VS development team for review. We will contact you if we require any additional information.

Posted by MS-Moderator01 on 12/14/2011 at 4:44 AM

Thank you for your feedback, we are currently reviewing the issue you have submitted. If this issue is urgent, please contact support directly(http://support.microsoft.com)