From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Jackson <Ian.Jackson@eu.citrix.com>
Subject: Re: [PATCH 2/9] tools/build: fix pygrub linking
Date: Tue, 17 Jul 2012 17:22:51 +0100
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To: Roger Pau Monne <roger.pau@citrix.com>
Cc: Christoph Egger <Christoph.Egger@amd.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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Roger Pau Monne writes ("Re: [PATCH 2/9] tools/build: fix pygrub linking"):
> diff --git a/tools/pygrub/Makefile b/tools/pygrub/Makefile
> index bd22dd4..182afdd 100644
> --- a/tools/pygrub/Makefile
> +++ b/tools/pygrub/Makefile
> @@ -14,7 +14,9 @@ install: all
>  		$(PYTHON_PREFIX_ARG) --root="$(DESTDIR)" \
>  		--install-scripts=$(PRIVATE_BINDIR) --force
>  	$(INSTALL_DIR) $(DESTDIR)/var/run/xend/boot
> +ifneq ($(shell readlink -f $(DESTDIR)/$(BINDIR)), $(shell readlink -f
> $(PRIVATE_BINDIR)))
>  	ln -sf $(PRIVATE_BINDIR)/pygrub $(DESTDIR)/$(BINDIR)
> +endif

Why are we doing all this work in make with $(shell...) rather than
simply in the command stanza ?

Also I'm a bit confused.  This problem occurs only when DESTDIR="" ?
In which case perhaps the right answer is something like
        set -e; if ! test -e $(DESTDIR)/$(BINDIR)/pygrub; then \
            ln -sf $(PRIVATE_BINDIR)/pygrub $(DESTDIR)/$(BINDIR); \
        fi

Ian.