How to use precompiled headers efficiently (using /Yc and Yu options)?

Question

We are using Visual Studio 2003 (VC71) for compilation. In order to reduce the compile time we changed the build script such that it generates the precompiled header (.pch) file

Answer 1

/Yc should only be used on one of your .cpp modules. This specifies to VS to create the precompiled header with that module.

For all others in your project, use /Yu. This specifies that they are to simply use the pch.

The MSDN entry for it is here: http://msdn.microsoft.com/en-us/library/szfdksca(v=VS.71).aspx