# FI

Tells the preprocessor to include a specified file name as the header file.

## Syntax

Linux: | None

macOS: | None

Windows: | /FI filename

## Arguments

filename | Is the file name to be included as the header file.

## Default

OFF | The compiler uses default header files.

## Description

This option tells the preprocessor to include a specified file name as the header file.

The file specified with /FI is included in the compilation before the first line of the primary source file.

## IDE Equivalent

Visual Studio: Advanced > Forced Include File

Eclipse: None

Xcode: None

## Alternate Options

None

Parent topic: Preprocessor Options