Autoconf, Automake, and Libtool: Looping

| ### 21.4.4 Looping There is no support in M4 for doing traditional iterations (ie. ``for-do'` loops), however macros may invoke themselves. Thus, it is possible to iterate using recursion. The recursive definition can use conditionals (21.4.3 Conditionals) to terminate the loop at its completion by providing a trivial case. The GNU M4 manual provides some clever recursive definitions, including a definition for a `forloop` macro that emulates a ``for-do'` loop. It is conceivable that you might wish to use these M4 constructs when writing macros to generate large amounts of in-line shell code or arbitrarily nested `if; then; fi` statements.

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