/GF (Eliminate Duplicate Strings)
Collapse the table of content
Expand the table of content
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here. ArchiveDisclaimer

/GF (Eliminate Duplicate Strings)

Enables the compiler to create a single copy of identical strings in the program image and in memory during execution, resulting in smaller programs, an optimization called string pooling.


/GF pools strings as read-only.

If you use /GF, the operating system does not swap the string portion of memory and can read the strings back from the image file. If you try to modify strings under /GF, an application error occurs.

String pooling allows what were intended as multiple pointers to multiple buffers to be as multiple pointers to a single buffer. In the following code, s and t are initialized with the same string. String pooling causes them to point to the same memory:

char *s = "This is a character buffer";
char *t = "This is a character buffer";

The /ZI option, used for Edit and Continue, automatically sets the /GF option.

/GF is in effect when /O1 or /O2 is used.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Property Pages dialog box. For details, see How to: Open Project Property Pages.

  2. Click the C/C++ folder.

  3. Click the Code Generation property page.

  4. Modify the Enable String Pooling property.

To set this compiler option programmatically

© 2016 Microsoft