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Native edit-and-continue not working in VS2012 RC by OfekShilon


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Type: Bug
ID: 746862
Opened: 6/5/2012 11:02:24 PM
Access Restriction: Public
User(s) can reproduce this bug


In the default-generated c++ console app, linking gives -
warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/OPT:LBR' specification
and indeed edit and continue doesn't work.
Under tools\options\debugging\edit and continue, 'enable native edit and continue' is checked. I've tried several debugger types too - they all fail.

/OPT:LBR is currently undocumented and there's no option to disable it. It certainly shouldn't be on by default, in particular in debug builds.
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Posted by OfekShilon on 6/9/2012 at 11:10 PM
In previous versions the warning issued was 'ignoring '/EDITANDCONTINUE' due to '/INCREMENTAL:NO' specification', as it should be. (if I had seen that warning, of course I wouldn't have submitted this issue).    
I'm sure other customers will get confused too - please consider fixing the warning text back to its helpful form.
Posted by Microsoft on 6/9/2012 at 9:41 AM
If you try to use the Edit and Continue feature, please add /INCREMENTAL to linker command line. Otherwise, drop /ZI option from compiler command line and instead use /Zi or /Z7, for which linker won't emit warning LNK4075.
Posted by Microsoft on 6/9/2012 at 9:35 AM
By "fixed" I meant that we have fixed the settings of the attached project to make Edit and Continue working and by doing that LNK4075 is also gone.
Posted by OfekShilon on 6/8/2012 at 9:50 PM
Thank you! I assume the 'fixed' status refers to fixing the erroneous warning text?
Posted by Microsoft on 6/8/2012 at 3:44 PM
To enable edit and continue functionality, we have to enable incremental linking. In your project it is turned off. Also after putting /incremental back to linker command line, the LNK4075 warning is gone.

To enable edit and continue, adding /INCREMENTAL to linker command line is necessary but not sufficient. We have to check the box of "Enable native Edit and Continue" in "Tools | Options | Debugging | Edit and Continue | Native-only options".
Posted by OfekShilon on 6/7/2012 at 12:00 PM
Sure - I attach both a video and the project that consistently reproduces it for me.
Posted by Microsoft on 6/6/2012 at 2:52 AM
Thank you for submitting feedback on Visual Studio and .NET Framework. In order to efficiently investigate and reproduce this issue, we are requesting additional information outlined below.

Could you please give us a video of this issue so that we can conduct further research?

We look forward to hearing from you with this information.

Microsoft Visual Studio Connect Support Team
Posted by Microsoft on 6/6/2012 at 2:40 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)
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File Name Submitted By Submitted On File Size  
RefTest3.rar 6/7/2012 2 KB
LBR.wmv 6/7/2012 678 KB