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Debug vs Release mode - Cannot open include file: 'stdafx.h'

Medium Priority
Last Modified: 2013-12-14
I have a fairly complex application which compiles fine in Debug mode (in Visual Studio .NET) but when I switch to Release mode I get the error:
fatal error C1083: Cannot open include file: 'stdafx.h': No such file or directory

The #include "stdafx.h" that this error refers to is from a file that was developed outside my project (ie. I added the .cpp and .h file, but not its corresponding stdafx.h - because I have my own.)

I don't understand why it would compile in Debug but not in Release.
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Top Expert 2012

Under your project settings, check whether your Debug and Release configurations are different in "Additional Include Directories" and make sure that these entries are the same (if applicable).


Yup I checked that, they're exactly the same :(
Top Expert 2012
Can you check with FileMon (http://www.microsoft.com/technet/sysinternals/FileAndDisk/Filemon.mspx) where the compiler is looking for that file in both cases?

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Is it possible that someone disabled "Precompiled headers" in debug mode?, but not in "Release" mode?


All the settings for the project seem to be the same for Debug and Release.

I have now noticed, however, that I only get the error if I try to "Build" the solution but if I click "Start" (debugging), it asks me if I want to build the solution (as it is not up to date), I click Yes, and it builds and runs ok.
Can anyone explain to me why this is so? I am fairly new to this and am getting a serious "crash course" (literally! lol).
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