Re: [Xen-devel] [PATCH 2/9] tools/build: fix pygrub linking

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

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.

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