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8 Programming in M4
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Autoconf is written on top of two layers: “M4sugar”, which provides
convenient macros for pure M4 programming, and “M4sh”, which provides
macros dedicated to shell script generation.

   As of this version of Autoconf, these two layers still contain
experimental macros, whose interface might change in the future.  As a
matter of fact, _anything that is not documented must not be used_.

* Menu:

* M4 Quotation::                Protecting macros from unwanted expansion
* Using autom4te::              The Autoconf executables backbone
* Programming in M4sugar::      Convenient pure M4 macros
* Debugging via autom4te::      Figuring out what M4 was doing