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SubjectRe: [PATCH 5/5] scripts/gdb: refactor rules for symlink creation
Hi Kieran,


On Wed, Feb 27, 2019 at 8:56 PM Kieran Bingham
<kieran.bingham@ideasonboard.com> wrote:
>
> Hi Yamada-san,
>
> On 19/02/2019 09:33, Masahiro Yamada wrote:
> > gdb-scripts is not a real object, but (ab)used like a phony target.
> >
> > Rewrite the code in a more Kbuild-ish way. Add symlinks to extra-y
> > and use if_changed.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> > ---
> >
> > scripts/gdb/linux/Makefile | 18 +++++++++++-------
> > 1 file changed, 11 insertions(+), 7 deletions(-)
> >
> > diff --git a/scripts/gdb/linux/Makefile b/scripts/gdb/linux/Makefile
> > index 7545806..3df395a 100644
> > --- a/scripts/gdb/linux/Makefile
> > +++ b/scripts/gdb/linux/Makefile
> > @@ -1,13 +1,17 @@
> > # SPDX-License-Identifier: GPL-2.0
> > -always := gdb-scripts
> >
> > -SRCTREE := $(abspath $(srctree))
> > -
> > -$(obj)/gdb-scripts:
> > ifneq ($(KBUILD_SRC),)
> > - $(Q)ln -fsn $(SRCTREE)/$(obj)/*.py $(objtree)/$(obj)
> > +
> > +symlinks := $(patsubst $(srctree)/$(src)/%,%,$(wildcard $(srctree)/$(src)/*.py))
> > +
> > +quiet_cmd_symlink = SYMLINK $@
> > + cmd_symlink = ln -fsn $(patsubst $(obj)/%,$(abspath $(srctree))/$(src)/%,$@) $@
> > +
> > +extra-y += $(symlinks)
> > +$(addprefix $(obj)/, $(symlinks)): FORCE
> > + $(call if_changed,symlink)
> > +
> > endif
> > - @:
> >
> > quiet_cmd_gen_constants_py = GEN $@
> > cmd_gen_constants_py = \
> > @@ -18,4 +22,4 @@ extra-y += constants.py
> > $(obj)/constants.py: $(src)/constants.py.in FORCE
> > $(call if_changed_dep,gen_constants_py)
> >
> > -clean-files := *.pyc *.pyo $(if $(KBUILD_SRC),*.py)
> > +clean-files := *.pyc *.pyo
>
> Perhaps this answers my earlier question.
> I guess the extra-y hook is somehow handling the clean up of these files?
>
> Aha - yes, I've just found it in
>
> Documentation/kbuild/makefiles.txt:
> > === 5 Kbuild clean infrastructure
> > ...
> > Kbuild knows targets listed in $(hostprogs-y), $(hostprogs-m), $(always), $(extra-y) and $(targets). They are all deleted during "make clean".
>
> Perfect, so this is much better.

Exactly.

If you are interested in the real code,
see scripts/Makefile.clean


__clean-files := $(extra-y) $(extra-m) $(extra-) \
$(always) $(targets) $(clean-files) \
$(hostprogs-y) $(hostprogs-m) $(hostprogs-) \
$(hostlibs-y) $(hostlibs-m) $(hostlibs-) \
$(hostcxxlibs-y) $(hostcxxlibs-m)





> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
>
> --
> Regards
> --
> Kieran



--
Best Regards
Masahiro Yamada

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