# ffriend-injection

Causes the compiler to inject friend functions into the enclosing namespace.

## Syntax

Linux and macOS: | -ffriend-injection -fno-friend-injection

Windows: | None

## Arguments

None

## Default

-fno-friend-injection | The compiler does not inject friend functions into the enclosing namespace. A friend function that is not declared in an enclosing scope can only be found using argument-dependent lookup.

## Description

This option causes the compiler to inject friend functions into the enclosing namespace, so they are visible outside the scope of the class in which they are declared.

On Linux systems, in gcc versions 4.1 or later, this is not the default behavior. This option allows compatibility with gcc 4.0 or earlier.

## IDE Equivalent

None

## Alternate Options

None

Parent topic: Language Options