Precompiled headers are used to speed up compilation of C/C++ projects.
Andrey Karpov has described in detail how to use precompiled headers and related nuances in the article "StdAfx.h for Novices".
- Andrey Karpov. StdAfx.h for Novices.
- Wikipedia. Precompiled headers.
- Stack Overflow. Precompiled headers with GCC.
- Stack Overflow. What's the use for "stdafx.h" in Visual Studio?