[vsipl++] [patch] Make configure options more consistent

[Brooks Moses]

Jules Bergmann wrote, at 1/23/2008 1:13 PM:
> Let's capture the naming decision in configure.ac.  Something like
> 
> # Rational for option naming
> #
> # The general rule is that --enable is used for features
> # and --with is used for specific libraries.
> #
> # In cases where an option controls both a feature and specifies
> # an external library, such as --enable-parallel, --enable should
> # be used.  The primary purpose of the option is turning on
> # the feature, the secondary purpose is specifying which
> # external code to use to enable that feature.

"Rationale", not "Rational", but otherwise I completely agree with this
proposed addition.  This should definitely be included to remind our
future selves that we did have good reasons for doing it this way, and I
think this accurately captures those reasons.

- Brooks