A '''preprocessor''' is tool that is used to transform a program's source code before feeding it into the compiler or interpreter that implements a particular language.

Some languages ([C], [C++], [Ratfor]) are strongly dependent on their preprocessors. Tcl is not normally used that way.

** Tcl preprocessors **
   * [Assemble (tool)]
   * [tpp]
   * [Tipi]
   * http://www.gener8.be/site/downloads/index.html%|%g2pp%|%
   * [c-like preprocessor facility]

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