[oe] [meta-oe][PATCH v2] libeigen: allow empty packages

[Vyacheslav Yurkov]

 Hi Martin,
Thanks for your comment. I did see discussion in the mailing list that
RDEPENDS_${PN}-dev is supposed to solve it, but it doesn't. To be fare, I
tried it again now:
- bitbake libeigen -c cleanall
- bitbake ceres-solver -c cleanall
- reverted my ALLOW_EMPTY_${PN} = "1" change
- bitbake my-image

After last step I got:
ERROR: my-image-dev-1.0-r0 do_rootfs: libeigen not found in the feeds (x86
corei7-64 core2-64 x86_64 noarch any all) in
/home/uvv/projects/yocto-x86/build/tmp/deploy/rpm.
ERROR: my-image-dev-1.0-r0 do_rootfs: This is often caused by an empty
package declared in a recipe's PACKAGES variable. (Empty packages are not
constructed unless ALLOW_EMPTY_<pkg> = '1' is used.)
ERROR: my-image-dev-1.0-r0 do_rootfs: Function failed: do_rootfs

If there's another way to solve this, I'm all ears. BTW, ceres-solver
recipe itself has ALLOW_EMPTY_${PN} = "1" already. I believe the reason is
the same as here.

Regards,
Vyacheslav

On Wed, Oct 3, 2018 at 8:35 AM Martin Jansa <martin.jansa at gmail.com> wrote:

> On Wed, Oct 03, 2018 at 08:24:22AM +0200, Vyacheslav Yurkov wrote:
> > libeigen is header-only library.
> > All headers go into dev package, therefore the main package is empty.
> > Dependency on the dev package doesn't work, so you have to allow
> > empty package for build to succeed for recipes that depend on libeigen
> > (e.g. ceres-solver). Otherwise an error occurs that empty packages
> > are not allowed.
>
> I still don't understand what the issue is, there is already
> RDEPENDS_${PN}-dev = "" and similar for ${PN}-dbg.
>
> Creating empty libeigen package to satisfy dependency from ceres-solver
> doesn't really fix anything (just installs useless empty package on
> target).
>
> > Signed-off-by: Vyacheslav Yurkov <uvv.mail at gmail.com>
> > ---
> >  meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
> b/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
> > index 31a42a9d6..a59320655 100644
> > --- a/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
> > +++ b/meta-oe/recipes-support/libeigen/libeigen_3.3.4.bb
> > @@ -18,3 +18,4 @@ FILES_${PN}-dev = "${includedir}
> ${datadir}/eigen3/cmake ${datadir}/cmake/Module
> >  # ${PN} is empty so we need to tweak -dev and -dbg package dependencies
> >  RDEPENDS_${PN}-dev = ""
> >  RRECOMMENDS_${PN}-dbg = "${PN}-dev (= ${EXTENDPKGV})"
> > +ALLOW_EMPTY_${PN} = "1"
> > --
> > 2.17.0
> >
> > --
> > _______________________________________________
> > Openembedded-devel mailing list
> > Openembedded-devel at lists.openembedded.org
> > http://lists.openembedded.org/mailman/listinfo/openembedded-devel
>
> --
> Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
>