[autoconf-conversion] Re: Toplevel configury, multilibs, new autoconf versions

[Zack Weinberg]

Phil Edwards <phil at jaj.com> writes:

> So, when the primary v3 configure is run,
> the toplevel does it via
>
>     CXX=Primary $srcdir/configure --stuff
>
> Clear?
>
> Now, at the end of that run, config.status is generated and executed.
> It source's config-ml.in, which runs through the list of multilib subdirs,
> and does text substitution on the env variables.  Pretend we have one
> multilib, and I'll call the CXX variable for that one Multilib:
>
>     # config-ml.in does this
>     Multilib=`echo Primary | sed 's/references-to-primary-dir/references-to-multilib-dir'`
>
>     cd up-and-over-to-multilib-dir/libstdc++-v3
>     CXX=Multilib $srcdir/configure --stuff

It seems to me that the problem is right here: we shouldn't have this
Primary/Multilib distinction in the first place.  Suppose we hoist all
the iteration over multilibs up to the top level Makefile.  Then each
multilib directory gets configured as a 'primary' and the symptoms
you've observed vanish.

I want this for other reasons - specifically, I want to be able to set
up a multilib set that doesn't have any primary (default).

zw