(autoconf.info)Programming in M4


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8 Programming in M4
*******************

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_.

* M4 Quotation
Protecting macros from unwanted expansion
* Using autom4te
The Autoconf executables backbone
* Programming in M4sugar
Convenient pure M4 macros
* Programming in M4sh
Common shell Constructs
* File Descriptor Macros
File descriptor macros for input and output

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