linux-kernel - Re: [PATCH v2 0/3] um: allow static linking for non-glibc libc implementations

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Message-ID: <CAFd5g44QK2L+Zkri9=mTFoLXTqdjORn-QATPomiKXkgZfA+wqw@mail.gmail.com>
Date:   Wed, 15 Jul 2020 01:36:49 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Ignat Korchagin <ignat@...udflare.com>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        linux-um <linux-um@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-team@...udflare.com
Subject: Re: [PATCH v2 0/3] um: allow static linking for non-glibc libc implementations

On Sat, Jul 4, 2020 at 1:52 AM Ignat Korchagin <ignat@...udflare.com> wrote:
>
> This is a continuation of [1]. Since I was able to produce a working UML binary
> with UML_NET_VECTOR linked with musl with the changes included in the patches
> here. I was compiling on Arch Linux, so hopefully all the latest versions of
> the compiler, libraries and binutils.
>
> I also tested allyesconfig with both musl and glibc. The compilation succeeds
> with both, however both binaries (glibc one being dynamically linked) segfault
> on start. This is probably of some incompatible config option/module being
> included and not related to musl/glibc.
>
> [1]: https://patchwork.ozlabs.org/project/linux-um/patch/20200624212319.403689-1-ignat@cloudflare.com/
>
> Ignat Korchagin (3):
>   um/kconfig: introduce CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS
>   um: some fixes to build UML with musl
>   um: allow static linking for non-glibc implementations
>
>  arch/um/Kconfig               |  2 +-
>  arch/um/drivers/Kconfig       |  3 ---
>  arch/um/drivers/daemon_user.c |  1 +
>  arch/um/drivers/pcap_user.c   | 12 ++++++------
>  arch/um/drivers/slip_user.c   |  2 +-
>  arch/um/drivers/vector_user.c |  4 +---
>  arch/um/os-Linux/util.c       |  2 +-
>  arch/x86/um/user-offsets.c    |  2 +-
>  init/Kconfig                  |  6 ++++++
>  scripts/cc-can-link.sh        |  5 +++--
>  10 files changed, 21 insertions(+), 18 deletions(-)

Sorry for taking so long to get to this. I saw this last week or
whenever and then forgot, saw the comments yesterday and remembered.

Looks pretty good overall. I will put my reviewed-by on each
individual patch. Nevertheless, I tested them all together, so being
lazy:

Tested-by: Brendan Higgins <brendanhiggins@...gle.com>