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From: "Pengcheng Xu" <i@jsteward.moe>
To: <gentoo-soc@lists.gentoo.org>
References: <20200622191553.2rodmf6heg6my25d@tardis.localdomain>
In-Reply-To: <20200622191553.2rodmf6heg6my25d@tardis.localdomain>
Subject: RE: [gentoo-soc] Weekly Report: Portage Powered Android
Date: Tue, 23 Jun 2020 12:45:12 +0800
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Sorry for not getting back for some time; I had some other affairs that kep=
t my hands busy. I have some comments for this week's report.
> -----Original Message-----
> From: Gunwant Jain <therealgunwant@gmail.com>
> Sent: Tuesday, June 23, 2020 3:16 AM
> To: gentoo-soc@lists.gentoo.org
> Cc: heroxbd@gentoo.org
> Subject: [gentoo-soc] Weekly Report: Portage Powered Android
>=20
> Hello Everyone,
>=20
> I was supposed to integrate `bootstrap-init` and `sar-preinit` into Shark=
Bait
> this week. I couldn't quite do that.
> `bootstrap-init` was initially cross-compiled for aarch64 using NDK. So t=
he
> first job was to get rid of NDK and use a different "build-system".
> I opted for CMake and ported the project to use it [1]. But the binary co=
mpiled
> by CMake on my phone (arm64 Gentoo), would not boot Android.
> The build rules can be inspected on [1].
Have you figured out _why_ Android is not booting? I can think of a bunch =
of reasons, such as missing dependencies for a dynamically-linked executabl=
e, crashing on execution, etc. Simply saying "would not boot Android" does=
not convey any information.
Besides, I don't think you need NDK for something as low-level as an init; =
you shouldn=E2=80=99t need one as long as the code does not use Android-spe=
cific functions or call into Android service (e.g. vold). You should be ab=
le to get away with something standard, i.e. newlib/musl/glibc. I haven't =
read the source code though, and I might be wrong here; do your survey.
>=20
> I believe this is because of the fact that I am not using a Bionic based =
toolchain.
> So, I started working on building such a toolchain mid-week.
> And this is where my current task starts coinciding with my next schedule=
d task
> of providing a aarch64-linux-android toolchain where we build Bionic as w=
ell.
> The crux of this task was already performed by KireinaHoro in his GSoC [2=
].
> Since my next scheduled task is required to be finished for my current ta=
sk,
> I propose to merge `bootstrap-init` along with `sar-preinit` together lat=
er
> in the SharkBait workflow.
You may try with bionic toolchain, but just as I said, so long as no Androi=
d-specific APIs are involved, libc should not be the problem.
>=20
> And to cover the installing process for users right now, I will write a b=
log
> and post it on [3] within 24 hours of writing this mail. The blog will pr=
ovide
> a guide on assembling the components required for System-As-Root based An=
droid
> devices and installing SharkBaitOS. Keep in mind that this process will i=
ndeed
> be simplified for the user later.
> And I propose to edit SharkBait's official wiki later in my GSoC tenure e=
xplaining
> the simplified procedure to end-users and porters.
>=20
> Thanks,
> Gunwant
>=20
> [1] https://gitlab.com/WantGuns/bootstrap-init/-/tree/cmake
> [2]
> https://wiki.gentoo.org/wiki/Android/SharkBait/Building_a_toolchain_for_aa
> rch64-linux-android
> [3] https://wantguns.gitlab.io/
Regards,
--=20
Pengcheng Xu
https://jsteward.moe
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