Re: [PATCH] avoid new AC_REQUIRE expanded-before-required warnings

[Ralf Wildenhues]

* Eric Blake wrote on Mon, Nov 16, 2009 at 07:57:34PM CET:
> Many 
> gnulib macros are one-shot, in that they take no arguments, perform a single 
> idempotent check

that does not rely on when in the configure script the check is
performed, so it could just as well be performed at most any point
earlier than the check that requires it,
(this is important!)

> , and set appropriate shell variables and a cache variable, 
> such that repeating the check would not discover anything different (with the 
> cache variable, the repeated check will not cost much time, but the repeated 
> expansion does cost space in the configure file); so those are good 
> candidates 
> for AC_DEFUN_ONCE.

Cheers,
Ralf