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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.

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 option.

Namespace: Microsoft.VisualStudio.VCProjectEngine
Assembly: Microsoft.VisualStudio.VCProjectEngine (in microsoft.visualstudio.vcprojectengine.dll)

bool UndefineAllPreprocessorDefinitions { get; set; }
/** @property */
boolean get_UndefineAllPreprocessorDefinitions ()

/** @property */
void set_UndefineAllPreprocessorDefinitions (/** @attribute InAttribute() */ boolean undefinePredefinedMacros)

function get UndefineAllPreprocessorDefinitions () : boolean

function set UndefineAllPreprocessorDefinitions (undefinePredefinedMacros : boolean)

Property Value

true if previously defined preprocessor values are undefined; otherwise, false.

See Examples 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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