at-specify-a-compiler-response-file.md

description	Learn more about: @ (Specify a Compiler Response File)
title	@ (Specify a Compiler Response File)
ms.date	11/04/2016
f1_keywords	@
helpviewer_keywords	response files, C/C++ compiler @ compiler option cl.exe compiler, specifying response files
ms.assetid	400fffee-909d-4f60-bf76-45833e822685

@ (Specify a Compiler Response File)

Specifies a compiler response file.

Syntax

@response_file

Arguments

response_file
A text file containing compiler commands.

Remarks

A response file can contain any commands that you would specify on the command line. This can be useful if your command-line arguments exceed 127 characters.

It is not possible to specify the @ option from within a response file. That is, a response file cannot embed another response file.

From the command line you can specify as many response file options (for example, @respfile.1 @respfile.2) as you want.

To set this compiler option in the Visual Studio development environment

• A response file cannot be specified from within the development environment and must be specified at the command line.

To set this compiler option programmatically

• This compiler option cannot be changed programmatically.

See also

MSVC Compiler Options
MSVC Compiler Command-Line Syntax