# strict-ansi

Tells the compiler to implement strict ANSI conformance dialect.

## Syntax

Linux: | -strict-ansi

macOS: | -strict-ansi

Windows: | None

## Arguments

None

## Default

OFF | The compiler conforms to default standards.

## Description

This option tells the compiler to implement strict ANSI conformance dialect. On Linux* systems, if you need to be compatible with gcc, use the -ansi option.

This option sets option fmath-errno, which tells the compiler to assume that the program tests errno after calls to math library functions. This restricts optimization because it causes the compiler to treat most math functions as having side effects.

## IDE Equivalent

Visual Studio: None

Eclipse: Language > ANSI Conformance

Xcode: Language > C Language Dialect and Language > C++ Language Dialect

## Alternate Options

None

Parent topic: Language Options