Precompiled Header

In computer programming, a precompiled header is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler. Usage of precompiled headers may significantly reduce compilation time, especially when applied to big header files or header files that include many other header files or header files that are included in many translation units.

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Precompiled Header - Common Implementations - C++Builder
... configuration, the C++Builder compiler implicitly generates precompiled headers for all headers included by a source module until the line #pragma hdrstop is found ... Precompiled headers are shared for all modules of the project if possible ... Component Library, it is common to include the vcl.h header first which contains most of the commonly used VCL header files ...