[Buildroot] [PATCH v7 03/18] core: re-enter make if $(CURDIR) or $(O) are not absolute canonical path

[Yann E. MORIN]

Matthew, All,

On 2016-03-22 18:11 -0500, Matthew Weber spake thusly:
> On Tue, Mar 22, 2016 at 5:07 PM, Yann E. MORIN <yann.morin.1998 at free.fr> wrote:
> > On 2016-03-20 20:45 -0500, Matthew Weber spake thusly:
> >> On Sun, Mar 20, 2016 at 8:44 PM, Matthew Weber <matt at thewebers.ws> wrote:
> >> > On Wed, Mar 9, 2016 at 4:58 PM, Samuel Martin <s.martin49 at gmail.com> wrote:
> >> >> When $(CURDIR) or $(O) contain symlinks (or mount-bind) in their path,
> >> >> they can be resolved differently, depending on each package build-system
> >> >> (whether it uses the given paths or get the absolute canonical ones).
> >> >>
> >> >> Thus, to make easier tracking down host machine paths leaking into the
> >> >> host, target or staging trees, the CURDIR and O variables are set to
> >> >> their absolute canonical paths.
> >> >>
> >> >> Note that this change takes care of the makefile wrapper installed in
> >> >> $(O) to avoid unneeded make recursion.
> >> >>
> >> >> Signed-off-by: Samuel Martin <s.martin49 at gmail.com>
[--SNIP--]
> >> > I've applied your v7 patches with these changes to the tip of
> >> > buildroot and currently run into the following error.  I'm still
> >> > poking around trying to understand why.
> >> >
> >> > $ make V=1 qemu_x86_defconfig
> >> > umask 0022 && \
> >> >         make -C /opt/buildroot --no-print-directory \
> >> >                 qemu_x86_defconfig O=
> >
> > Why are you opassing an empty O= option here?
> >
> 
> I'm not passing the O= .

Damned, I see. It's passed by the sub-make. My bad.

Otherwise, I know why it fails: we should not try to canonicalise $(O)
if it is not set. That's that simple.

Regards,
Yann E. MORIN.

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