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From: "Pengcheng Xu" <i@jsteward.moe>
To: <gentoo-soc@lists.gentoo.org>
References: <20200629201204.hssao7lsdtcmpsme@tardis.localdomain>
In-Reply-To: <20200629201204.hssao7lsdtcmpsme@tardis.localdomain>
Subject: RE: [gentoo-soc] Weekly Report: Portage Powered Android
Date: Wed, 1 Jul 2020 22:07:46 +0800
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Hi Gunwant,
Glad to see your progress regarding the toolchain. Stupid Microsoft Outloo=
k won't do inline replies correctly, so bear with me if you see the followi=
ng folded in your email client. And yes, I'm aware that the line breaks ar=
e completely messed up (i.e. super-long lines). I've planned to fix it som=
e time later, just don't have much time to spare recently...
Anyway, find my comments below.
> -----Original Message-----
> From: Gunwant Jain <therealgunwant@gmail.com>
> Sent: Tuesday, June 30, 2020 4:12 AM
> To: gentoo-soc@lists.gentoo.org
> Subject: [gentoo-soc] Weekly Report: Portage Powered Android
>=20
> Hello Everyone,
>=20
> This week, I had relatively less work done.
> I spent most of my time perusing the LFS guide and osdev.org learning
> about building toolchains. Then I went onto building the
> aarch64-linux-android toolchain as described in [1]. I updated the
> kernel sources for my phone [2]. And in general tidied up my kernel
> repository.
It's good that you chose to get familiar with the GNU build system (autotoo=
ls); it will save you large amounts of time when meddling with toolchain-re=
lated work. I would also suggest taking a look at the "GNU Hello" project;=
it serves as a genuine example of the basics for a GNU project, which GCC =
is as well. Get familiar with how to read the configuration and compilatio=
n logs, especially when they're littered with libtool calls instead of dire=
ctly calling the compiler.
> But while building the toolchain, I was not able to compile `gcc` as
> I was riddled with errors along the way. Most of them are related to the
> newer `gcc` (version 9.x) finding incompatibility in the sources of the
> `gcc` I am trying to build (version 4.9).
> I will continue to build the toolchain and hopefully move onto
> separating `Bionic` from the other side of Android mid-week.
Just as Benda pointed out, 4.9 may be the one I chose two years ago, but it=
's not a hard requirement: most Android things should compile fine with any=
newer versions of GCC as long as the toolchain is correctly configured for=
an Android target; in many occasions even Clang works perfectly fine. You=
may try to fix the problems in the 4.9 tree, tweak the options for the "bu=
ild" compiler (gcc-9) to accept older, non-compliant sources, or try to fin=
d a newer version of GCC source tree with Android (i.e. Bionic) support. Y=
ou may have better luck looking for such a source tree in the AOSP codebase.
>=20
> Thanks,
> Gunwant
>=20
> [1]
> https://wiki.gentoo.org/wiki/Android/SharkBait/Building_a_toolchain_for_aa
> rch64-linux-android
> [2]
> https://github.com/WantGuns/overlay/blob/master/sys-kernel/linux-headers/l
> inux-headers-4.4.222.ebuild
And, we'd love to see a link to your weekly writeup of your efforts and pro=
blems encountered in greater detail. We can find out more about your progr=
ess and perhaps provide assistance if we can see the exact problem; for exa=
mple, it would be helpful if you quoted or linked to the exact error messag=
e in the gcc build process you just mentioned. It's also a good idea to ke=
ep these in track for archival purposes, such that future contributors can =
have an idea of what's going on if they run into the same problem.
Regards,
--=20
Pengcheng Xu
https://jsteward.moe
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