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foo.cpp(33918) : fatal error C1854: cannot overwrite information formed 
during creation of the precompiled header in object file: 'c:\somepath\foo.obj'

Consulting MSDN about this gives me the following information:

You specified the /Yu (use precompiled header) option after specifying the /Yc (create precompiled header) option for the same file. Certain declarations (such as declarations including __declspec dllexport) make this invalid.

We are using dllexport and precompiled headers in this case. Have anyone encountered this before and know of any workaround? Any input to shed some light on this problem is greatly appreciated.

Thanks

ralphtheninja
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3 Answers3

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I think you can find the answer here: http://social.msdn.microsoft.com/forums/en-US/vclanguage/thread/b3aa10fa-141b-4a03-934c-7e463f92b2a5/

Basically, you need to set the stdafx.cpp file to "Create Precompiled Headers" and all the other .cpp files to "Use Precompiled Headers"

cspirz
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    Clean the solution after changing the options is recommended. – nergeia Sep 28 '13 at 14:12
  • Do I get this correctly: the options dialog that looks like the project options isn't actually the project options but options for the source file that I have currently selected? – Thomas Weller Dec 16 '20 at 14:43
1

I had this problem too.

Make sure the precompiler header output file is set to the correct location. Mine was actually outputted to the right location, but there were problems reading it just because the path had a little artifact inside.

Tony
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0

My solution was to carefully recheck all the precompiled header settings in not just the .exe project but all the dll projects also and recreate all the headers. After that the error was gone in the .exe compilation.

user3699614
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