Re: I need support with a planned POSIX make extension

On Fri, 6 Aug 2021 at 02:41, Joerg Schilling <[email protected]> wrote:

> David Holland <[email protected]> wrote:
>
> > On Mon, Aug 02, 2021 at 06:42:14PM +0200, Joerg Schilling wrote:
> >  > Do you believe that POSIX should include a method to control whether
> $$ is
> >  > expanded with := or not?
> >
> > I don't know the history of this (or at least, not without going and
> > raking it up) but I'd say that $$ should never be expanded except at
> > the final output stage. The purpose of $$ is to produce $ in the
> > output, not cater to monstrosities like $$$$$$$$(VAR) that depend on
> > knowing exactly how many and which eval stages are going to be applied
> > to your text.
>
> OK, from our discussions at the POSIX teleconferences, we came to the
> conclusion that using $$ is extremely rare
>

I find that .... puzzling.  If I was Living in the 70's, backtick would be
the norm for command substitution.  But I'm not. so Instead I use $() which
means $$() is common.

(and having combined that with GNU Make's define+eval which relies on $$,
yes I've ended up with plenty of monstrosities, mea culpa)