Re: [Qemu-devel] [PATCH] Makefile: Allow "make cscope TAGS" in unconfigured source tree

[Fam Zheng <famz@redhat.com>]

On Mon, 02/09 08:25, Peter Maydell wrote:
> On 9 February 2015 at 08:08, Fam Zheng <famz@redhat.com> wrote:
> > It doesn't make much sense to ask one to switch to build dir in order to
> > make these two targets.
> >
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  Makefile | 13 ++++++++-----
> >  1 file changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 6817c6f..257bef6 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -3,6 +3,9 @@
> >  # Always point to the root of the build tree (needs GNU make).
> >  BUILD_DIR=$(CURDIR)
> >
> > +# Before including a proper config-host.mak, assume we are in the source tree
> > +SRC_PATH=.
> > +
> >  # All following code might depend on configuration variables
> >  ifneq ($(wildcard config-host.mak),)
> >  # Put the all: rule here so that config-host.mak can contain dependencies.
> > @@ -38,7 +41,7 @@ config-host.mak: $(SRC_PATH)/configure
> >         fi
> >  else
> >  config-host.mak:
> > -ifneq ($(filter-out %clean,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),,fail))
> > +ifneq ($(filter-out %clean TAGS cscope,$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),,fail))
> 
> Probably better to define a variable for the targets which can be
> called on an unconfigured directory rather than having "clean TAGS cscope"
> in two places.
> 
> >  cscope:
> > -       rm -f ./cscope.*
> > -       find "$(SRC_PATH)" -name "*.[chsS]" -print | sed 's,^\./,,' > ./cscope.files
> > -       cscope -b
> > +       rm -f "$(SRC_PATH)"/cscope.*
> > +       find "$(SRC_PATH)/" -name "*.[chsS]" -print | sed 's,^\./,,' > "$(SRC_PATH)/cscope.files"
> > +       cscope -b -i"$(SRC_PATH)/cscope.files"
> 
> Isn't this going to result in our writing the cscope.files into the
> source tree but the cross-reference into the build directory?
> That seems inconsistent (and I'm not really convinced about the
> wisdom of anything in the makefile writing to the source tree).

This patch is useful when you really want "make cscope", when you're already at
your $(SRC_PATH). The "find | sed; cscope" command sequence is way too
cumbersome.

For those who are not the in-tree build type, I assume leaving out '-f
"$(SRC_PATH)/cscope.out"' should slightly ease the concern about writing to
source tree? :)

I don't know a better place to put the reference. I always start vim from
$(SRC_PATH).

Fam