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From: Szabolcs Nagy <nsz@port70.net>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: Out-of-tree builds
Date: Thu, 27 Feb 2014 14:29:46 +0100
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* Szabolcs Nagy <nsz@port70.net> [2014-02-26 23:56:14 +0100]:
> third try, with configure changes and some simplifications
> 
> (configure detects out-of-tree build and copies the Makefile,
> there is an ifndef block in the Makefile to add extra rules
> for directory creation)

hm the makefile shouldn't be copied, it's enough to link it
or create one with "include $srcdir/Makefile"
(so if the source repo is updated the new makefile will be
used for the out-of-tree build)

> +if test -f Makefile ; then
> +echo "using existing Makefile"
> +else
> +cp $srcdir/Makefile . || fail "$0: cannot create Makefile"
> +fi
> +

else
printf "creating Makefile... "
echo "include $srcdir/Makefile" >Makefile
echo "done"
fi