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Re: [PATCH] AC_CONFIG_MACRO_DIRS: improve tracing and add sanity checks

From: Adrian Bunk
Subject: Re: [PATCH] AC_CONFIG_MACRO_DIRS: improve tracing and add sanity checks
Date: Tue, 13 Nov 2012 01:12:14 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, Nov 12, 2012 at 05:41:29PM -0500, Nick Bowler wrote:
> On 2012-11-12 15:19 -0700, Eric Blake wrote:
> > But since we can't make it continue to work with the new
> > semantics of AC_CONFIG_MACRO_DIRS, the best we can do (and indeed, what
> > we DID do) is loudly flag incorrect usage as an error rather than
> > silently change semantics.
> Sorry, I don't understand.  You seem to be claiming that the addition of
> AC_CONFIG_MACRO_DIRS (an entirely new macro, with documented behaviour)
> to Autoconf will somehow break the following pattern if we don't also
> change the definition of AC_CONFIG_MACRO_DIR?
> What breaks?  How does it break?  Why will this not continue to work
> exactly as it has in the past if we do not keep AC_CONFIG_MACRO_DIR's
> definition exactly as it is right now, i.e.:
> ?

The problem is not the addition of AC_CONFIG_MACRO_DIRS itself,
but in the whole picture:

In the future libtool will use the result of tracing 
AC_CONFIG_MACRO_DIR_TRACE instead of grep'ing



       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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