Is there a way to use pre-compiled headers in VC++ without requiring stdafx.h?

Question

I\'ve got a bunch of legacy code that I need to write unit tests for. It uses pre-compiled headers everywhere so almost all .cpp files have a dependecy on stdafx.h which is

Answer 1

Precompiled headers can save a lot of time when rebuilding a project, but if a precompiled header changes, every source file depending on the header will be recompiled, whether the change affects it or not. Fortunately, precompiled headers are used to compile, not link; every source file doesn't have to use the same pre-compiled header.

pch1.h:

#include 
#include ...

pch1.cpp:

#include "pch1.h"

source1.cpp:

#include "pch1.h"
[code]

pch2.h:

#include 
#include ...

pch2.cpp:

#include "pch2.h"

source2.cpp

#include "pch2.h"
[code]

Select pch1.cpp, right click, Properties, Configuration Properties, C/C++, Precompiled Headers.
Precompiled Header : Create(/Yc)
Precompiled Header File: pch1.h
Precompiled Header Output File: $(intDir)pch1.pch

Select source1.cpp
Precompiled Header : Use(/Yu)
Precompiled Header File: pch1.h
Precompiled Header Output File: $(intDir)pch1.pch (I don't think this matters for /Yu)

Do the same thing for pch2.cpp and source2.cpp, except set the Header File and Header Output File to pch2.h and pch2.pch. That works for me.