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What's New in the Visual Basic Compiler 

Visual Basic 2005 includes new compiler options and other compiler changes.

Conditional Compilation

Visual Basic introduces the following new conditional-compilation constants for all projects:

  • TRACE. a Boolean value you can set to specify that methods of the Trace class generate output to the Output window.

  • VBC_VER. the Visual Basic version, in major.minor format. For Visual Basic 2005, the value of VBC_VER is 8.0.

For more information, see Conditional Compilation Constants

Default Command-Line Options in Vbc.rsp

The Visual Basic command-line compiler now stores the default command-line options in the Vbc.rsp file, in the same directory as the command-line compiler, Vbc.exe. You can edit Vbc.rsp to reconfigure the default command-line options.

New Command-Line Options

There are seven new command-line compiler options:

  • The /codepage option specifies which code page to use when opening source files.

  • The /doc option generates an XML documentation file based on comments within your code.

  • The /errorreport option provides a convenient way to report a Visual Basic internal compiler error to Microsoft.

  • The /filealign option specifies the size of sections in your output file.

  • The /noconfig option specifies that the compiler should not automatically reference the commonly used .NET Framework assemblies or import the System and Microsoft.VisualBasic namespaces.

  • The /nostdlib option removes the automatic reference to the System.dll assembly and other commonly used assemblies.

  • The /platform option specifies the processor to be targeted by the output file, in those situations where it is necessary to explicitly specify it.

/nowarn and /warnaserror

The /nowarn and /warnaserror options provide more control over how warnings are handled. These compiler options now takes a list of warning IDs as an optional parameter, to specify to which warnings the option applies.

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