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

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

[Fabrice Fontaine]

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@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@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@gmail.com>
+[Upstream status: rejected (https://github.com/mono/mono/pull/18648)]
+---
+ configure.ac | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/configure.ac b/configure.ac
+index d724f9e2d27d..b323ca1b14bd 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2206,6 +2206,11 @@ if test x$host_win32 = xno; then
+ 	dnl *****************************
+ 	AC_CHECK_LIB(socket, socket, LIBS="$LIBS -lsocket")
+ 
++	dnl *****************************
++	dnl *** Checks for libunwind  ***
++	dnl *****************************
++	AC_CHECK_LIB(unwind, _Unwind_GetIP, LIBS="$LIBS -lunwind")
++
+ 	case "$host" in
+ 		*-*-*freebsd*)
+ 			dnl *****************************
-- 
2.29.2

[Buildroot] [PATCH 2/2] package/mono: disable boehm

[Fabrice Fontaine]

mono uses the Unity fork of recent Boehm since version 6.10.0.65 and
https://github.com/mono/mono/commit/cc137237d86b0553e844dc34c9a3cbc5b20782c0

However, this raises the following build failure:

/tmp/instance-0/output-1/per-package/mono/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/bits/string3.h:81: warning: memset used with constant zero length parameter; this could be due to transposed parameters
../../external/bdwgc/.libs/libgc.a(gc.o): In function `GC_steal_mark_stack':
gc.c:(.text+0x1d18): undefined reference to `AO_store_full_emulation'

So just disable boehm

Fixes:
 - http://autobuild.buildroot.org/results/f921db5824b3062ba37c91af0ac07835c6e1b34c

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
 package/mono/mono.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/mono/mono.mk b/package/mono/mono.mk
index df3481a498..dc11e744e8 100644
--- a/package/mono/mono.mk
+++ b/package/mono/mono.mk
@@ -22,6 +22,7 @@ MONO_COMMON_CONF_OPTS = --with-mcs-docs=no \
 	--with-ikvm-native=no \
 	--enable-minimal=profiler,debug \
 	--enable-static \
+	--disable-boehm \
 	--disable-btls \
 	--disable-system-aot
 
-- 
2.29.2

[Buildroot] [PATCH 2/2] package/mono: disable boehm

[Thomas Petazzoni]

On Wed, 20 Jan 2021 18:54:43 +0100
Fabrice Fontaine <fontaine.fabrice@gmail.com> wrote:

> mono uses the Unity fork of recent Boehm since version 6.10.0.65 and
> https://github.com/mono/mono/commit/cc137237d86b0553e844dc34c9a3cbc5b20782c0
> 
> However, this raises the following build failure:
> 
> /tmp/instance-0/output-1/per-package/mono/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/bits/string3.h:81: warning: memset used with constant zero length parameter; this could be due to transposed parameters
> ../../external/bdwgc/.libs/libgc.a(gc.o): In function `GC_steal_mark_stack':
> gc.c:(.text+0x1d18): undefined reference to `AO_store_full_emulation'

Well, isn't it simply forgetting to link with libatomic_ops ?

Look at your patch from 2018 on bdgwc:
http://lists.busybox.net/pipermail/buildroot/2018-November/235145.html,
the issue was the same, and was caused by the fact that it wasn't
linking with libatomic_ops.

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

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

[Thomas Petazzoni]

On Wed, 20 Jan 2021 18:54:42 +0100
Fabrice Fontaine <fontaine.fabrice@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@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@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@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