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VCCLCompilerTool.UndefineAllPreprocessorDefinitions Property

Gets or sets a value indicating whether to undefine all previously defined preprocessor values. UndefineAllPreprocessorDefinitions exposes the functionality of the compiler's /U, /u (Undefine Symbols) option.

Namespace:  Microsoft.VisualStudio.VCProjectEngine
Assembly:  Microsoft.VisualStudio.VCProjectEngine (in Microsoft.VisualStudio.VCProjectEngine.dll)
abstract UndefineAllPreprocessorDefinitions : bool with get, set

Property Value

Type: System.Boolean
true if previously defined preprocessor values are undefined; otherwise, false.

See How to: Compile Example Code for Project Model Extensibility for information about how to compile and run this example.

The following example modifies the UndefineAllPreprocessorDefinitions property in the integrated development environment (IDE):

' add reference to Microsoft.VisualStudio.VCProjectEngine.
Imports EnvDTE
Imports Microsoft.VisualStudio.VCProjectEngine

Public Module Module1
    Sub Test()
        Dim prj As VCProject
        Dim cfgs, tools As IVCCollection
        Dim cfg As VCConfiguration
        Dim tool As VCCLCompilerTool
        prj = DTE.Solution.Projects.Item(1).Object
        cfgs = prj.Configurations
        cfg = cfgs.Item(1)
        tool = cfg.Tools("VCCLCompilerTool")
        tool.UndefineAllPreprocessorDefinitions = True
    End Sub
End Module
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