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/fsanitize (Enable sanitizers)

Use the /fsanitize compiler options to enable sanitizers.

Syntax

/fsanitize=address
/fsanitize=kernel-address
/fsanitize=fuzzer
/fsanitize-address-use-after-return
/fno-sanitize-address-vcasan-lib /fsanitize-address-asan-compat-lib /fno-sanitize-address-asan-compat-lib

Remarks

The /fsanitize=address compiler option enables AddressSanitizer, a powerful compiler and runtime technology to uncover hard-to-find bugs. Support for the /fsanitize=address option is available starting in Visual Studio 2019 version 16.9.

The /fsanitize=kernel-address compiler option enables Kernel AddressSanitizer (KASan). KASan is the kernel-mode variant of AddressSanitizer, available starting in Visual Studio 2022 version 17.11. KASan is only supported on Windows 11 24H2 or Windows Server 2025 and higher, and requires building using a Windows SDK 10.0.26100.2161 and higher. Building with KASan also implies the /fsanitize-address-asan-compat-lib compiler option.

The /fsanitize=fuzzer compiler option enables experimental support for LibFuzzer. LibFuzzer is a coverage-guided fuzzing library that can be used to find bugs and crashes caused by user-provided input. We recommended you use /fsanitize=address with LibFuzzer. This option is useful for fuzzing tools such as OneFuzz. For more information, see the OneFuzz documentation and OneFuzz GitHub project. Support for the /fsanitize=fuzzer option is available starting in Visual Studio 2022 version 17.0.

The /fsanitize option doesn't allow comma-separated syntax, for example: /fsanitize=address,fuzzer. These options must be specified individually.

The /fsanitize-address-use-after-return, /fno-sanitize-address-vcasan-lib, /fsanitize-address-asan-compat-lib, and /fno-sanitize-address-asan-compat-lib compiler options, and the /INFERASANLIBS (Use inferred sanitizer libs) and /INFERASANLIBS:NO linker options offer support for advanced users. For more information, see AddressSanitizer build and language reference.

To set the /fsanitize=address compiler option in the Visual Studio development environment

  1. Open your project's Property Pages dialog box.

  2. Select the Configuration Properties > C/C++ > General property page.

  3. Modify the Enable AddressSanitizer property. To enable it, choose Yes (/fsanitize=address).

  4. Choose OK or Apply to save your changes.

To set the /fsanitize=fuzzer compiler option in the Visual Studio development environment

  1. Open your project's Property Pages dialog box.

  2. Select the Configuration Properties > C/C++ > General property page.

  3. Modify the Enable Fuzzer property. To enable it, choose Yes (/fsanitize=fuzzer).

  4. Choose OK or Apply to save your changes.

To set the advanced compiler options

  1. Open your project's Property Pages dialog box.

  2. Select the Configuration Properties > C/C++ > Command Line property page.

  3. Modify the Additional Options property to set /fsanitize-address-use-after-return or /fno-sanitize-address-vcasan-lib.

  4. Choose OK or Apply to save your changes.

To set this compiler option programmatically

See also

MSVC compiler options
MSVC compiler command-line syntax
/INFERASANLIBS (Use inferred sanitizer libs)
/fsanitize-coverage (Configure sanitizer coverage)
AddressSanitizer overview
AddressSanitizer known issues
AddressSanitizer build and language reference

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