Re: How to PROVIDE boost-python


Laurent Gauthier
 

Hi again Emily,

You have put your finger on the core issue there.

The name of the boost python library which is linked in your
"opc-ua-server-gfex" recipe is "boost_python-mt" where it seems that
it should be "boost_python3-mt".

I guess you should have a look at the CMakeLists.txt of the
"opc-ua-server-gfex" software package to see how to switch to linking
with "boost_python3-mt" instead as a quick review of the boost recipe
seems to reveal no python2 support.

Kind Regards, Laurent.

On Tue, Mar 17, 2020 at 7:19 PM Emily S <easmith5555@...> wrote:

Hi Laurent -

Thanks for the suggestion. It looks like there are a few packages that provide libboost_python3:

find tmp/work/*/*/*/packages-split -name libboost_python\*
tmp/work/aarch64-poky-linux/boost/1.64.0-r0/packages-split/boost-dev/usr/lib/libboost_python3.so
tmp/work/aarch64-poky-linux/boost/1.64.0-r0/packages-split/boost-python/usr/lib/libboost_python3.so.1.64.0
tmp/work/aarch64-poky-linux/boost/1.64.0-r0/packages-split/boost-staticdev/usr/lib/libboost_python3.a
tmp/work/aarch64-poky-linux/boost/1.64.0-r0/packages-split/boost-dbg/usr/lib/.debug/libboost_python3.so.1.64.0

Adding boost-python to RDEPENDS doesn't help, I have tried it before also. This sort of made sense to me as I thought RDEPENDS was for run time dependencies, but perhaps I have misunderstood.

I am working with the rocko branch and python2, so perhaps that's the problem?

Thanks,
Emily


On Tue, Mar 17, 2020 at 1:02 PM Laurent Gauthier <laurent.gauthier@...> wrote:

Hi Emily,

To find the solution to your issue in a rational and deterministic way
we need to start from the error message.

What I understand is that while build recipe "opc-ua-server-gfex" you
get an error message that says in short "ld: cannot find
-lboost_python-mt".

Therefore you need to determine which recipe (and which package in
that recipe) provides the "boost_python-mt" library.

One way to determine this is to run something like this:

find /local/d6/easmith5/rocko_bitbake/poky/build/tmp/work/*/*/*/packages-split
-name libboost_python\*

This should show you which recipe, and which package produced by that
recipe has the library you are looking for.

The names of the first-level directories inside "packages-split" are
packages names.

Based on things you have mentioned in your previous e-mail my guess
would be that adding an RDEPENDS = "boost-python" should help, but I
might be wrong.

I hope this will help you move in the right direction.

Kind regards, Laurent.


On Tue, Mar 17, 2020 at 6:07 PM Emily <easmith5555@...> wrote:

Hi Quentin -

That's what I tried originally! DEPENDS on boost and not boost-python gives me the following error when trying to build my original recipe:

/local/d6/easmith5/rocko_bitbake/poky/build/tmp/work/aarch64-poky-linux/opc-ua-server-gfex/1.0+gitAUTOINC+921c563309-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/7.3.0/ld:
cannot find -lboost_python-mt

So I tried a bunch of other this which also didn't seem to work.

Thanks for the response!
Emily


On Tue, Mar 17, 2020 at 11:04 AM Quentin Schulz <quentin.schulz@...> wrote:

Hi Emily,

On Tue, Mar 17, 2020 at 10:44:10AM -0500, Emily wrote:
Hi all -

I'm trying to build an opca recipe (
https://github.com/kratsg/meta-l1calo/blob/add/opcServer/recipes-core/opc-ua/opc-ua-server-gfex_git.bb)
and it's giving me a build error like:

|
/local/d6/easmith5/rocko_bitbake/poky/build/tmp/work/aarch64-poky-linux/opc-ua-server-gfex/1.0+gitAUTOINC+921c563309-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/7.3.0/ld:
cannot find -lboost_python-mt

Which seems to indicated I need to add boost-python to my list of DEPENDS.
When I do that I get the error:

ERROR: Nothing PROVIDES 'boost-python' (but
/local/d6/easmith5/rocko_bitbake/meta-l1calo/recipes-core/opc-ua/
opc-ua-server-gfex_git.bb DEPENDS on or otherwise requires it). Close
matches:
boost RPROVIDES boost-python

I've tried adding PACKAGECONFIG_pn-boost="python" to both my local.conf and
to the image definition as I saw this online, but neither seems to work. It
seems like boost-python is being built (I can see it in the list when I run
oe-pkgdata-utils list-pkgs -p boost) but it doesn't seem to be available at
build for this recipe.

If I remove boost from my list of DEPENDS I get an error about that, so
obviously boost itself is available at build for the original recipe. I've
also tried adding boost-native to DEPENDS, also did not work.

Is there something obvious I'm missing, or some trick to making
boost-python available at build for this other recipe?
Ok so two things.

Yes, I'd say you need python in PACKAGECONFIG for boost. However, it
seems it's already part of the default value of PACKAGECONFIG, c.f.
http://cgit.openembedded.org/openembedded-core/tree/meta/recipes-support/boost/boost.inc?h=master#n45
so if no bbappend is overriding it, I'd say you're safe. Better check
with the version in your layer that it's there.
If you don't want to check manually, try `bitbake -e boost | grep -e
"^PACKAGECONFIG="`

DEPENDS contains only recipes (well, PROVIDES but PROVIDES has the name
of the recipe in it at all times) while RDEPENDS_* (usually ${PN}*) contains
only packages.

So you need to DEPENDS on boost, not boost-python. That should be enough
hopefully!

Quentin


--
Laurent Gauthier
Phone: +33 630 483 429
http://soccasys.com
--
Laurent Gauthier
Phone: +33 630 483 429
http://soccasys.com

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