VC.Net, ENORMOUS Pb with VC7 linker optimisation !

ENORMOUS Pb with VC7 linker optimisation !

Author	Message
Emmanuel Derrie #1 / 4	ENORMOUS Pb with VC7 linker optimisation ! Hi ! I found an enormous bug in my VC7 Release project : I read an archive file written few weeks ago by the same project but compiled with VC6. Inside this archive, one of my derived CObject class was written. Now, in Debug, no pb. In Release, I catch a CArchiveException because the class name is not found in runtimeclass global list !!!! Why ? It seems to be an optimisation bug of the linker, because when I put "Keep Unreferenced Data (/OPT:NOREF)" in linker options, it works !!!!!!! Note that the class is used as local variable in a function of my project, so it is referenced... Any explanations ? -- Emmanuel Derriey WinLog SA : http://www.--*.com/
Sun, 03 Jul 2005 01:39:14 GMT

Jon Sturgeo #2 / 4	ENORMOUS Pb with VC7 linker optimisation ! Quote: >Hi ! >I found an enormous bug in my VC7 Release project : I read an archive file >written few weeks ago by the same project but compiled with VC6. Inside this >archive, one of my derived CObject class was written. >Now, in Debug, no pb. >In Release, I catch a CArchiveException because the class name is not found >in runtimeclass global list !!!! Why ? It seems to be an optimisation bug of >the linker, because when I put "Keep Unreferenced Data (/OPT:NOREF)" in >linker options, it works !!!!!!! >Note that the class is used as local variable in a function of my project, >so it is referenced... >Any explanations ? Might your problem be related to the bug described in the post below? http://groups.google.com/groups?th=d9851ea2869caaa8 Jon
Sun, 03 Jul 2005 04:28:11 GMT

Emmanuel Derrie #3 / 4	ENORMOUS Pb with VC7 linker optimisation ! Jon Thanks for your answer. It seems to be the problem I had, but why, in my case, is it resolved by changing Linker option ? In article you gave me, C++ had been modified to solve the problem ! -- Emmanuel Derriey WinLog SA : http://www.winlog.com Quote: > On Tue, 14 Jan 2003 18:39:14 +0100, "Emmanuel Derriey" Quote: > >Hi ! > >I found an enormous bug in my VC7 Release project : I read an archive file > >written few weeks ago by the same project but compiled with VC6. Inside this > >archive, one of my derived CObject class was written. > >Now, in Debug, no pb. > >In Release, I catch a CArchiveException because the class name is not found > >in runtimeclass global list !!!! Why ? It seems to be an optimisation bug of > >the linker, because when I put "Keep Unreferenced Data (/OPT:NOREF)" in > >linker options, it works !!!!!!! > >Note that the class is used as local variable in a function of my project, > >so it is referenced... > >Any explanations ? > Might your problem be related to the bug described in the post below? > http://groups.google.com/groups?th=d9851ea2869caaa8 > Jon
Sun, 03 Jul 2005 16:53:52 GMT

Phil Lucido [MSF #4 / 4	ENORMOUS Pb with VC7 linker optimisation ! Quote: > Jon > Thanks for your answer. It seems to be the problem I had, but why, in my > case, is it resolved by changing Linker option ? > In article you gave me, C++ had been modified to solve the problem ! > -- > Emmanuel Derriey > WinLog SA : http://www.winlog.com It's difficult to know for sure why /opt:noref would hide this problem in your project. It's possible that the way MFC uses __declspec(selectany) might be triggering this. What seems clear, though, is that the real issue is a bug in the IMPLEMENT_SERIAL implementation, as described in http://groups.google.com/groups?th=d9851ea2869caaa8. The bug is also referenced by KB article 322621, http://support.microsoft.com/default.aspx?scid=kb;en-us;322621. -- Phil Lucido, Visual C++ Team This posting is provided AS IS with no warranties, and confers no rights.
Tue, 12 Jul 2005 03:50:05 GMT

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