@ (Specify a Compiler Response File)
Visual Studio 2012
Specifies a compiler response file.
@response_file
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
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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
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This compiler option cannot be changed programmatically.