[Buildroot] [PATCH 1/2] package/mono: fix build with libunwind

Thomas Petazzoni thomas.petazzoni at bootlin.com
Thu Jan 21 21:14:30 UTC 2021


On Wed, 20 Jan 2021 18:54:42 +0100
Fabrice Fontaine <fontaine.fabrice at gmail.com> wrote:

> Commit 4be06fa8aa054e59d97866dc5568f4e10762e353 wrongly removed this
> patch which was rejected by upstream (and so not merged). Moreover,
> there is no way to disable unwind backtrace on mono. An interested party
> could try to send this patch again or work with upstream to add an
> option to disable backtrace.
> 
> Fixes:
>  - http://autobuild.buildroot.org/results/17f1282abda00aedaea1f3edbcae1b216b70552a
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> ---
>  ...01-configure-ac-checks-for-libunwind.patch | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 package/mono/0001-configure-ac-checks-for-libunwind.patch
> 
> diff --git a/package/mono/0001-configure-ac-checks-for-libunwind.patch b/package/mono/0001-configure-ac-checks-for-libunwind.patch
> new file mode 100644
> index 0000000000..3d9d8a249f
> --- /dev/null
> +++ b/package/mono/0001-configure-ac-checks-for-libunwind.patch
> @@ -0,0 +1,38 @@
> +From 05c9f2d51e74e847ebfa1efdd495d2b146803a07 Mon Sep 17 00:00:00 2001
> +From: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> +Date: Wed, 15 May 2019 22:30:01 +0200
> +Subject: [PATCH] configure.ac: checks for libunwind
> +
> +_Unwind_GetIP is used in build_stack_trace however this function can be
> +provided by libunwind so check for it to avoid the following build
> +failure:
> +
> +/home/buildroot/autobuild/run/instance-1/output/host/lib/gcc/arm-buildroot-linux-musleabihf/7.4.0/../../../../arm-buildroot-linux-musleabihf/bin/ld: ./.libs/libmini.a(libmini_la-mini-exceptions.o): in function `build_stack_trace':
> +/home/buildroot/autobuild/run/instance-1/output/build/mono-5.20.1.27/mono/mini/mini-exceptions.c:365: undefined reference to `_Unwind_GetIP'
> +collect2: error: ld returned 1 exit status
> +
> +Fixes:
> + - http://autobuild.buildroot.net/results/dbd64c89815d393a4e28b312d74fd80ee6de92da
> +
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> +[Upstream status: rejected (https://github.com/mono/mono/pull/18648)]

Well, it was not rejected, they made some comments and you didn't
follow-up, so they closed for inactivity.

In fact, I remember discussing/researching this issue a while ago with
Angelo, and Arnout also looked into this. See
http://lists.buildroot.org/pipermail/buildroot/2019-May/250772.html. I
don't remember if we reached a conclusion back then.

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com



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