autoconf: Programming in M4sugar

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1 8.3 Programming in M4sugar
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1 M4 by itself provides only a small, but sufficient, set of all-purpose
1 macros.  M4sugar introduces additional generic macros.  Its name was
1 coined by Lars J. Aas: "Readability And Greater Understanding Stands 4
1 M4sugar".
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1    M4sugar reserves the macro namespace `^_m4_' for internal use, and
1 the macro namespace `^m4_' for M4sugar macros.  You should not define
1 your own macros into these namespaces.
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Menu

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· Redefined M4 Macros         M4 builtins changed in M4sugar
· Diagnostic Macros           Diagnostic messages from M4sugar
· Diversion support           Diversions in M4sugar
· Conditional constructs      Conditions in M4
· Looping constructs          Iteration in M4
· Evaluation Macros           More quotation and evaluation control
· Text processing Macros      String manipulation in M4
· Number processing Macros    Arithmetic computation in M4
· Set manipulation Macros     Set manipulation in M4
· Forbidden Patterns          Catching unexpanded macros
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