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8.3.2 Looping constructs
The following macros implement loops in M4.
— Macro: m4_for ( var, first, last, [step], expression)
Loop over the numeric values between first and last
including bounds by increments of step. For each iteration,
expand expression with the numeric value assigned to var.
If step is omitted, it defaults to ‘1’ or ‘-1’ depending
on the order of the limits. If given, step has to match this
order.
— Macro: m4_foreach ( var, list, expression)
Loop over the comma-separated M4 list list, assigning each value
to var, and expand expression. The following example
outputs two lines:
m4_foreach([myvar], [[foo], [bar, baz]],
[echo myvar
])
— Macro: m4_foreach_w ( var, list, expression)
Loop over the whitespace-separated list list, assigning each value
to var, and expand expression.
The deprecated macro AC_FOREACH is an alias of
m4_foreach_w.
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