Re: speedup bootstrap

[Peter O'Gorman]

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Ralf Wildenhues wrote:
| While working on the outstanding patch queue, I finally got fed up
| enough with CVS HEAD bootstrap and all the pizzas I had to eat each
| time, that it needed to be fixed.  ;-)
|
| m4 tail recursion sucks performance-wise, if the argument lists are
| long, because: even if shift/m4_shiftn is fast(?), the whole stuff needs
| to be copied anyway for the new macro call.
|
| Just to make clear just how much of an issue this is: the code recurses
| as much as 600 C function calls deep (as seen by randomly interrupting
| m4 in a debugger; I haven't attempted to find the true maximum).
|
| So, let's do in some manual tail recursion elimination.
|
| OK to apply the combined patch below?
|

You know, I looked at sppeding up bootstrap for myself about a year ago, but
couldn't figure out the cause.

This is okay, even thouh I don't actually understand it :)

Peter
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