From: Romain Naour <romain.naour@gmail.com>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCH v2 00/12] Add the support for Clang cross-compiler
Date: Mon, 14 Sep 2020 21:53:16 +0200 [thread overview]
Message-ID: <7d8a4fff-2ca5-4dc1-fe8d-098422070519@gmail.com> (raw)
In-Reply-To: <6b09950c-b36e-fdab-ff93-503445e7cddb@mind.be>
Hi Arnout,
Le 29/08/2020 ? 20:53, Arnout Vandecappelle a ?crit?:
> Hi Romain,
>
> After almost a year, let's try to make some progress on this series :-)
>
> On 07/09/2019 11:40, Romain Naour wrote:
> [snip]
>> Recently, I've tried to build an aarch64 Linux kernel (5.2.7) with
>> Clang and it worked under Qemu [3]. I also tested for x86_64 but we need
>> the upcomming llvm/clang version 9 to build the kernel [4].
>
> Since we waited long enough, this is now in Buildroot :-)
We are in late about llvm version, the version 11 should be released anytime soon.
>
>> This new version add the support of "asm-goto" which was the last
>> missing part to be able to build the Linux kernel on x86_64 [5].
>> But for theses tests, only the kernel was built with Clang.
>>
>> While testing the x86_64 kernel and it's rootfs built with Clang under Qemu,
>> I had a runtime issue during the userspace boot process (Busybox's init).
>> While searching about the issue, I discover the lowRISC blog from Lu?s Marques
>> about the same issue and tested the patch he contributed to the Busybox project
>> (Thanks!).
>>
>> So, this series is about to complete the integration of Clang as cross-compiler
>> by using a toolchain-wrapper and fixing some build system infrastructure
>> (cmake, meson) to use Clang instead of GCC.
>
> I started integrating the series, but then I had some fundamental problems with
> the core patch itself. So I stopped and pushed my results to
> https://gitlab.com/arnout/buildroot branch clang-as-cross-compiler. I put my
> changes as squash patches rather than changing the original patches, so you can
> easily take over from there. Note that I haven't tested my rebased and modified
> branch (just a build test immediately after applying the modified patch), so
> there may still be some rebase f**up there.
>
> I'll put my feedback in the individual patches.
Thanks!
I'm not sure how many free time I will able to devote to this series.
I recently did a test with llvm/clang 10 for risv64 [1] but the series needs
some work to be upstreamable...
I'd like to be able to work on this series as a full day job :)
[1] https://asciinema.org/a/DDspJVktlVl1Rh97dwLgtYcRY
Best regards,
Romain
>
> Regards,
> Arnout
>
>>
>> Add this new experimental option into "Advanced" menu since we are expecting
>> some build and runtime issues for number of packages (bootloaders, kernel).
>>
>> For now, Clang cross-compiler can only be use as internal toolchain,
>> so it is build from the source which take a long time...
> [snip]
>
prev parent reply other threads:[~2020-09-14 19:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-07 9:40 [Buildroot] [PATCH v2 00/12] Add the support for Clang cross-compiler Romain Naour
2019-09-07 9:40 ` [Buildroot] [PATCH v2 01/12] package/clang: help host-clang to find our external toolchain Romain Naour
2019-09-09 14:26 ` Matthew Weber
2020-08-29 19:00 ` Arnout Vandecappelle
2019-09-07 9:40 ` [Buildroot] [PATCH v2 02/12] package/llvm: add the version major variable Romain Naour
2020-08-29 19:00 ` Arnout Vandecappelle
2019-09-07 9:40 ` [Buildroot] [PATCH v2 03/12] package/clang: " Romain Naour
2019-09-07 9:40 ` [Buildroot] [PATCH v2 04/12] package/clang: install a toolchain-wrapper for the host clang cross-compiler Romain Naour
2020-08-29 19:40 ` Arnout Vandecappelle
2019-09-07 9:40 ` [Buildroot] [PATCH v2 05/12] linux: override CC for the case CC is not GCC Romain Naour
2020-08-30 7:57 ` Arnout Vandecappelle
2019-09-07 9:40 ` [Buildroot] [PATCH v2 06/12] package/meson: use TARGET_{CC, CXX} instead of TARGET_CROSS for cc and cpp Romain Naour
2019-09-07 9:40 ` [Buildroot] [PATCH v2 07/12] package/busybox: fix applets runtime issue when building with clang cross-compiler Romain Naour
2019-09-09 14:29 ` Matthew Weber
2020-08-29 20:21 ` Arnout Vandecappelle
2020-09-14 19:58 ` Romain Naour
2019-09-07 9:40 ` [Buildroot] [PATCH v2 08/12] package/clang: add a host entry for clang Romain Naour
2020-08-29 20:34 ` Arnout Vandecappelle
2019-09-07 9:40 ` [Buildroot] [PATCH v2 09/12] package/glibc: use GCC cross-compiler if Clang is used as cross-compiler Romain Naour
2019-09-07 9:40 ` [Buildroot] [PATCH v2 10/12] core: allow to use Clang " Romain Naour
2019-09-09 14:29 ` Matthew Weber
2020-08-29 21:13 ` Arnout Vandecappelle
2019-09-07 9:40 ` [Buildroot] [PATCH v2 11/12] toolchain: add a warning when Clang is used " Romain Naour
2019-09-07 9:40 ` [Buildroot] [PATCH v2 12/12] linux: don't set -Wno-attribute-alias flag " Romain Naour
2019-09-09 14:28 ` Matthew Weber
2020-08-29 18:53 ` [Buildroot] [PATCH v2 00/12] Add the support for Clang cross-compiler Arnout Vandecappelle
2020-09-14 19:53 ` Romain Naour [this message]
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