[Buildroot] Package with dependency with another git
Yann E. MORIN
yann.morin.1998 at free.fr
Thu Aug 23 16:36:52 UTC 2018
Louis-Paul, All,
On 2018-08-23 17:32 +0200, lpdev at cordier.org spake thusly:
> Currently adding a new package to buildroot, I have a package "A" that fetch its sources on git, and is a cmake-package. This
> package A also require another git repo "B" to be fetched, and a CMake a path in _CONF_OPTS that points to repo "B" must be added.
Meh... Not nice...
> My solution was to create a new package "B" on which package "A" depends on, and use generic-package with no build rules. Buildroot
> is taking care of fetching the sources automatically then.
>
> However I did not find any way to point on build directory of package B from packagea.mk. Package build are named with the
> following: package_name-version. I am currently pointing to the path manually in my script like this:
>
> PACKAGEA_CONF_OPTS += -DREPOB_DIR=$(BUILD_DIR)/packageb-$(PACKAGEB_VERSION)/
>
> My questions are:
>
> - Is it a good practice to do this?
Well, you basically have no other choice, unless you are also in charge
of said packages, in which case maybe having B as a git-submodule of A
could make things a bit easier...
Does B provide a library?
Can B be installed on its own?
Can A be told to use a pre-install B?
> - Is it a good practice to create a package that only fetch sources?
Good practice, not really. But not bad either. We have a few such
packages, which are then used to provide extensions to the linux kernel.
See for example package/aufs/aufs.mk
> - Is there any variable to point to the build dir of a specific package?
$($(PKGNAME)_SRCDIR)
... where you'd replace $(PKGNA<ME) with the name of package B in your
case.
> - Would it be better to add a pre-configure in packagea.mk hook that calls git and fetch the repo B?
Nope, otherwise you'd side-track Buildroot download infra, which alows
doing off-line builds:
$ make source
[get coffee and wait]
[unplug network]
$ make
[should succeed]
Regards,
Yann E. MORIN.
> Thank you for you help.
>
> BR,
> Louis-Paul CORDIER
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