| title | /experimental:preprocessor (Enable preprocessor conformance mode) | |||
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| description | Use the /experimental:preprocessor compiler option to enable experimental compiler support for a standard conforming preprocessor. | |||
| ms.date | 10/31/2019 | |||
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This option enables an experimental, token-based preprocessor that more closely conforms to C++11 standards, including C99 preprocessor features. For more information, see MSVC experimental preprocessor overview.
/experimental:preprocessor[-]
Use the /experimental:preprocessor compiler option to enable the experimental conforming preprocessor. You can use /experimental:preprocessor- option to explicitly specify the traditional preprocessor.
The /experimental:preprocessor option is available starting in Visual Studio 2017 version 15.8.
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Open the project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.
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Select the Configuration Properties > C/C++ > Command Line property page.
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Modify the Additional Options property to include /experimental:preprocessor and then choose OK.