cannot compile C file with the /clr option

To set this compiler option in Visual Studio

• 1. In Solution Explorer, right-click the project name, and then click Properties to open the project Property Pages dialog box.

  2. Select the Configuration Properties folder.

  3. On the General property page, modify the Common Language Runtime support property->Select No Common Language Runtime support

     1. 1. Note

           1. When /clr is enabled in the Property Pages dialog box, compiler option properties that are not compatible with /clr are also adjusted, as required. For example, if /RTC is set and then /clr is enabled, /RTC will be turned off.

           2. Also, when you debug a /clr application, set the Debugger Type property to Mixed or Managed only. For more information, see Project Settings for a C++ Debug Configuration.