c1xx : fatal error C1027: Inconsistent values for /Ym between creation and use of precompiled header

[Jeff Mayo]

I'm trying to port C++ applications that built with VS 2005 to VS 2008. I'm using a build procedure that invokes VS from the command line many times using the devenv command. On my own computer, I get the C1027 error building a project. The same project works properly on other machines and works OK on my machine if I build it from inside the IDE. Any suggestions for a fix or workaround?

Second, what does this error message mean? I can't find any documentation on the /Ym command line switch for the C++ compiler.

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