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Re: Bug#372179: AC_CANONICAL_SYSTEM overwrites $@

From: Justin Erenkrantz
Subject: Re: Bug#372179: AC_CANONICAL_SYSTEM overwrites $@
Date: Mon, 19 Jun 2006 09:17:49 -0700

On 6/19/06, Tollef Fog Heen <address@hidden> wrote:
* Ralf Wildenhues

| Hello Justin, Tollef,
| * Justin Erenkrantz wrote on Sun, Jun 18, 2006 at 11:40:12PM CEST:
| > On 6/18/06, Tollef Fog Heen <address@hidden> wrote:
| > >Currently, if configure is passed --sbindir=, it just overrides
| > >$sbindir without flagging that at all.  If it, in addition to changing
| > >$sbindir, it'd set ac_param_sbindir either to 1 to show that sbindir
| > >is derviced from a command line argument or to the value passed on the
| > >command line.  If we had this, APR_LAYOUT could check if
| > >ac_param_sbindir was set, and if so skip setting sbindir from the
| > >layout.
| > >
| > >Would this be an acceptable solution for both the APR and the autoconf
| > >people?
| >
| > That could work for our purposes, yes.  It'd be cleaner to boot, too.
| So what do you do with
|   --bindir=/foo --with-layout=bar --sbindir=/baz
| shouldn't the bar layout override bindir but not sbindir?  (Note I don't
| know the exact semantics --with-layout is supposed to have.)

IMO, command line ordering shouldn't matter, unless you do
--bindir=/foo --bindir=/bar.  --with-layout just changes the defaults,
it doesn't override the state you're currently in.

Correct.  Anything explicitly provided on the command-line is
literally respected - the layout file just allows the user to change
autoconf's defaults in a straightforward manner.  -- justin

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