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Subject: bug#7562: automake-set variables don't get properly reordered when overriden in Makefile.am
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Severity: wishlist

This issue was brought up by Ralf Wildenhues in a thread on automake-patches.

Automake generally orders all of its variable settings before all of the user
ones (so the user ones are preferred).  But when one overrides e.g. bindir in
a Makefile.am, that variable doesn't get reordered to the user part, because
it is actually automake-set before it is overridden.  The issue is exposed in
the attached testcase.

It's still not clear to me whether this is a bug or a feature, but I thought
that entering it into the Automake bug database would be a good idea anyway.

Regards,
   Stefano

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#! /bin/sh

# Test that := definitions work as expected at make time, even when
# whey involve user-overridden automake-set variables.
#
# Currently, this test doesn't work, because automake generally orders
# all of its variable settings (e.g. bindir and the like) before all
# of the user ones.  Even when  bindir is overridden, it doesn't get
# reordered to the user part.  Might this be considered an automake bug?

required=GNUmake
. ./defs || Exit 1

set -e

cat >> configure.in << 'END'
AC_OUTPUT
END

cat > Makefile.am << 'END'
BAR := $(bindir)
BAZ = $(bindir)
bindir = foo
.PHONY: test
test:
	test x'$(bindir)' = x'foo'
	test x'$(BAZ)' = x'foo'
	test x'$(BAR)' = x
END

$ACLOCAL
$AUTOCONF
$AUTOMAKE -Wno-portability

./configure
$MAKE test

:

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To: Stefano Lattarini <stefano.lattarini@HIDDEN>
Subject: bug#7562: Acknowledgement (automake-set variables don't get
 properly reordered when overriden in Makefile.am)
Message-ID: <handler.7562.B.129157023819351.ack <at> debbugs.gnu.org>
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Message sent to owner <at> debbugs.gnu.org, bug-automake@HIDDEN:

Subject: bug#7562: automake-set variables don't get properly reordered when overriden in Makefile.am
Resent-From: Jack Kelly <jack@HIDDEN>
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Date: Mon, 6 Dec 2010 07:28:04 +1100
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From: Jack Kelly <jack@HIDDEN>
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Remark: This may be unrelated.

I don't know about overriding in Makefile.am, but overriding $(prefix)
is important for supporting GNU Stow. To set up a package for Stow,
you configure for one prefix and install under another (note that this
isn't the same as using $(DESTDIR) - that dumps the whole directory
tree under the target path).

Example:

./configure --prefix=3D$HOME
make
make prefix=3D$HOME/stow/foo-x.y.z
cd $HOME/stow
stow foo-x.y.z

So whatever you do with the variable ordering, I hope it doesn't break
overrides from the command line.

-- Jack

On Mon, Dec 6, 2010 at 4:34 AM, Stefano Lattarini
<stefano.lattarini@HIDDEN> wrote:
> Severity: wishlist
>
> This issue was brought up by Ralf Wildenhues in a thread on automake-patc=
hes.
>
> Automake generally orders all of its variable settings before all of the =
user
> ones (so the user ones are preferred). =A0But when one overrides e.g. bin=
dir in
> a Makefile.am, that variable doesn't get reordered to the user part, beca=
use
> it is actually automake-set before it is overridden. =A0The issue is expo=
sed in
> the attached testcase.
>
> It's still not clear to me whether this is a bug or a feature, but I thou=
ght
> that entering it into the Automake bug database would be a good idea anyw=
ay.
>
> Regards,
> =A0 Stefano
>
>
>
> #! /bin/sh
>
> # Test that :=3D definitions work as expected at make time, even when
> # whey involve user-overridden automake-set variables.
> #
> # Currently, this test doesn't work, because automake generally orders
> # all of its variable settings (e.g. bindir and the like) before all
> # of the user ones. =A0Even when =A0bindir is overridden, it doesn't get
> # reordered to the user part. =A0Might this be considered an automake bug=
?
>
> required=3DGNUmake
> . ./defs || Exit 1
>
> set -e
>
> cat >> configure.in << 'END'
> AC_OUTPUT
> END
>
> cat > Makefile.am << 'END'
> BAR :=3D $(bindir)
> BAZ =3D $(bindir)
> bindir =3D foo
> .PHONY: test
> test:
> =A0 =A0 =A0 =A0test x'$(bindir)' =3D x'foo'
> =A0 =A0 =A0 =A0test x'$(BAZ)' =3D x'foo'
> =A0 =A0 =A0 =A0test x'$(BAR)' =3D x
> END
>
> $ACLOCAL
> $AUTOCONF
> $AUTOMAKE -Wno-portability
>
> ./configure
> $MAKE test
>
> :
>
>

Message sent to owner <at> debbugs.gnu.org, bug-automake@HIDDEN:

Subject: bug#7562: automake-set variables don't get properly reordered when overriden in Makefile.am
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On Sunday 05 December 2010, Jack Kelly wrote:
> Remark: This may be unrelated.
> 
> I don't know about overriding in Makefile.am, but overriding $(prefix)
> is important for supporting GNU Stow. To set up a package for Stow,
> you configure for one prefix and install under another (note that this
> isn't the same as using $(DESTDIR) - that dumps the whole directory
> tree under the target path).
> 
> Example:
> 
> ./configure --prefix=$HOME
> make
> make prefix=$HOME/stow/foo-x.y.z
> cd $HOME/stow
> stow foo-x.y.z
> 
> So whatever you do with the variable ordering, I hope it doesn't break
> overrides from the command line.
> 
Oh, it must absolutely not break that, since the behaviour you want is
mandated by the GNU coding standards, and cannot be changed.  Breaking
it would be a *grave* automake bug.  So I guess you're safe in this
respect.

Regards,
  Stefano

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Hello,

* Stefano Lattarini wrote on Sun, Dec 05, 2010 at 09:50:52PM CET:
> On Sunday 05 December 2010, Jack Kelly wrote:
> > make prefix=$HOME/stow/foo-x.y.z

> > So whatever you do with the variable ordering, I hope it doesn't break
> > overrides from the command line.
> > 
> Oh, it must absolutely not break that, since the behaviour you want is
> mandated by the GNU coding standards, and cannot be changed.  Breaking
> it would be a *grave* automake bug.  So I guess you're safe in this
> respect.

Of course, the GNU Coding Standards are a bit oblivious of existing
limitations of non-GNU make implementations at this point; see
  info Autoconf "Macros and Submakes"

Oh well.  Another issue completely unrelated to this PR ...  ;-)

Cheers,
Ralf

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On Mon, Dec 6, 2010 at 7:50 AM, Stefano Lattarini
<stefano.lattarini@HIDDEN> wrote:
> On Sunday 05 December 2010, Jack Kelly wrote:
>> Remark: This may be unrelated.
>>
>> I don't know about overriding in Makefile.am, but overriding $(prefix)
>> is important for supporting GNU Stow. To set up a package for Stow,
>> you configure for one prefix and install under another (note that this
>> isn't the same as using $(DESTDIR) - that dumps the whole directory
>> tree under the target path).
>>
>> Example:
>>
>> ./configure --prefix=3D$HOME
>> make
>> make prefix=3D$HOME/stow/foo-x.y.z
>> cd $HOME/stow
>> stow foo-x.y.z
>>
>> So whatever you do with the variable ordering, I hope it doesn't break
>> overrides from the command line.
>>
> Oh, it must absolutely not break that, since the behaviour you want is
> mandated by the GNU coding standards, and cannot be changed. =A0Breaking
> it would be a *grave* automake bug. =A0So I guess you're safe in this
> respect.

I'm glad you're on top of that. I just wanted to bring it up in case
it had been forgotten.

Thanks.

-- Jack

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On Sunday 05 December 2010, Ralf Wildenhues wrote:
> Hello,
> 
> * Stefano Lattarini wrote on Sun, Dec 05, 2010 at 09:50:52PM CET:
> > On Sunday 05 December 2010, Jack Kelly wrote:
> > > make prefix=$HOME/stow/foo-x.y.z
> 
> > > So whatever you do with the variable ordering, I hope it doesn't break
> > > overrides from the command line.
> > > 
> > Oh, it must absolutely not break that, since the behaviour you want is
> > mandated by the GNU coding standards, and cannot be changed.  Breaking
> > it would be a *grave* automake bug.  So I guess you're safe in this
> > respect.
> 
> Of course, the GNU Coding Standards are a bit oblivious of existing
> limitations of non-GNU make implementations at this point; see
>   info Autoconf "Macros and Submakes"
> 
> Oh well.  Another issue completely unrelated to this PR ...  ;-)
> 
Well, let's just say the `prefix' overriding should continue to work with
GNU make as it did before ;-) ...

Regards,
  Stefano

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