How to pass a switch parameter to another PowerShell script?

Try

compile-tool1.ps1 -VHDL2008:$VHDL2008.IsPresent

You can specify $true or $false on a switch using the colon-syntax:

compile-tool1.ps1 -VHDL2008:$true
compile-tool1.ps1 -VHDL2008:$false

So just pass the actual value:

compile-tool1.ps1 -VHDL2008:$VHDL2008

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