/AI (Specify Metadata Directories)
Specifies a directory that the compiler will search to resolve file references passed to the #using directive.
Syntax
/AIdirectory
Arguments
directory
The directory or path for the compiler to search.
Remarks
Only one directory can be passed to an /AI invocation. Specify one /AI option for each path you want the compiler to search. For example, to add both C:\Project\Meta and C:\Common\Meta to the compiler search path for #using directives, add /AI"C:\Project\Meta" /AI"C:\Common\Meta" to the compiler command line or add each directory to the Additional #using Directories property in Visual Studio.
To set this compiler option in the Visual Studio development environment
Open the project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.
Select the Configuration Properties > C/C++ > General property page.
Modify the Additional #using Directories property.
To set this compiler option programmatically
See also
MSVC Compiler Options
MSVC Compiler Command-Line Syntax
#using Directive