Re: $ in make's := operator (was: CVS commit: pkgsrc/mk)

[Jonathan Perkin <jperkin%pkgsrc.org@localhost>]

* On 2021-11-30 at 12:33 GMT, Roland Illig wrote:

> > Date: Tue, 30 Nov 2021 09:06:37 +0000
> > From: Jonathan Perkin <jperkin%netbsd.org@localhost>
> > To: pkgsrc-changes%NetBSD.org@localhost
> > Subject: CVS commit: pkgsrc/mk
> > X-Mailer: log_accum
> >
> > Module Name:    pkgsrc
> > Committed By:   jperkin
> > Date:           Tue Nov 30 09:06:37 UTC 2021
> >
> > Modified Files:
> >         pkgsrc/mk: bsd.prefs.mk
> >
> > Log Message:
> > mk: Don't expand OPSYS_VERSION early.
>
> The goal of this line was to not evaluate the command from line 92 more
> than once.

It's unclear to me whether it makes any difference, as these variables 
are already wrapped in .if !defined() earlier and set in MAKEFLAGS.  

At the very least it should be documented better, as it's not clear (at 
least to me) why we would need both constructs simultaneously.

> > Something about NetBSD make(1), at least on 9_STABLE, doesn't like doing this,
> > resulting in literal "$$3" being passed to awk instead of being escaped down
> > to "$3".  The same construct works fine with pkgsrc bmake(1).
>
> For some reason, .MAKE.SAVE_DOLLARS defaults to true in
> pkgsrc/devel/bmake (for backwards compatibility) and to false in NetBSD
> as well as Simon's bmake distribution.

Ah, interesting, thanks for explaining.

> Why does a version number of an operating system contain a '$' at all?

I don't understand the question.  They don't?

Cheers,

--
Jonathan Perkin       www.perkin.org.uk
github.com/jperkin  twitter.com/jperkin