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Re: AC_CANONICAL_* and automake variables

From: Nick Bowler
Subject: Re: AC_CANONICAL_* and automake variables
Date: Wed, 25 Jul 2012 16:09:02 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

On 2012-07-25 15:50 -0400, NightStrike wrote:
> This link says that the canonical macros will make
> build/host/target_triplet make variables available.  What's the
> difference between using for instance $target and $target_triplet?
> Will they always be the same?

They are defined as

  target_triplet = @target@
  host_triplet = @host@
  build_triplet = @build@

etc., by Automake, and have been defined that way since 1996.  Given the
history, I doubt they will be changed at this point.  They are
apparently related to dejagnu support.  All the others:


are provided directly by autoconf calling AC_SUBST.

> Why does automake create redundant variables?

Looks like hysterical raisins to me.

Nick Bowler, Elliptic Technologies (

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