Why Should \"pch.h\" Be the First Header File in C/C Projects?

Precompiled Header: Understanding "pch.h"

In C and C development, "pch.h" stands for a precompiled header file. Its inclusion as the first header file offers significant benefits in terms of compilation speed.

What is a Precompiled Header?

A precompiled header is an intermediate form of a header file generated by the compiler. It contains compiled information that optimizes the compilation process, especially for large or heavily included header files.

Why Include "pch.h" as the First Header File?

In Visual Studio, configuring a project to use a precompiled header is crucial.

• Early Content Exclusion: The compiler option "/Yu" specifies that anything preceding the "#include "pch.h"" line in the source file is deemed already compiled and is excluded from the compilation process.
• Faster Compilation: Using a precompiled header file significantly reduces the time required for compilation.

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