Re: [PATCH 07/12] use a shell function for AC_CHECK_HEADER

[Paolo Bonzini]

Ralf Wildenhues wrote:
> * Paolo Bonzini wrote on Mon, Oct 27, 2008 at 10:35:19AM CET:
>> Let's go again.  I retimed the effect of upgrading from 2.61 to after
>> the whole series of patches, and I get a 45-55% reduction in autoconf
>> execution time (approx. 20% are already there in 2.63) and 30-35%
>> reduction in configure script size.  In other words, with the latest
>> patches the complexity of m4sh processing is lowered, and the speedup
>> is more consistent with the decrease in output size.
> 
> Out of curiosity, how much of the speedup is attributable to
> improvements in m4 (or did you use the same version throughout)
> and to the changes between 2.61 and 2.63?

I'll measure.

> It looks to me like overall, the shell function changes will make user
> code even more reliant on correct M4 quotation than before.

Why?  Anyway, shell functions will have to be mentioned in NEWS.

Paolo