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Re: recursive make variables coming to POSIX

From: Ralf Wildenhues
Subject: Re: recursive make variables coming to POSIX
Date: Thu, 2 Dec 2010 20:10:19 +0100
User-agent: Mutt/1.5.20 (2010-08-04)

Hi Eric,

* Eric Blake wrote on Thu, Dec 02, 2010 at 06:14:28PM CET:
> Good news!  Today's Austin Group meeting included a review of
>, which is proposing that
> $(var$(V)) as a way of choosing between $(var0) and $(var1) based on the
> contents of $(V) be standardized in POSIX.  If the 30-day interpretation
> window starting today does not raise any objections (that is, if no one
> complains of a counterexample existing make implementation that fails to
> meet the proposed wording), then automake's silent-make implementation
> will switch from exploiting unspecified behavior over to using a
> POSIX-standardized feature.

Thank you very much for pursuing this!

I'm not sure if it was mentioned before in the discussion, but
portability-wise, there is a difference between one level of recursion
and arbitrary many.  IIRC then IRIX make only supported one level, i.e.,

was erroneous, but

was not.  Also, with a one-character variable X

was erroneous with at least one legacy make implementation (but I think
it was more than one); but


If you like, I can go back and verify the details.


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