[OE-core] [dizzy][PATCH] libunwind: backport patch to link against libgcc_s intead of libgcc

[Khem Raj]

> On Mar 10, 2015, at 7:33 PM, Jonathan Liu <net147 at gmail.com> wrote:
> 
> Signed-off-by: Jonathan Liu <net147 at gmail.com>
> ---
> ...-libunwind-to-libgcc_s-rather-than-libgcc.patch | 42 ++++++++++++++++++++++
> meta/recipes-support/libunwind/libunwind_1.1.bb    |  1 +
> 2 files changed, 43 insertions(+)
> create mode 100644 meta/recipes-support/libunwind/libunwind-1.1/Link-libunwind-to-libgcc_s-rather-than-libgcc.patch
> 
> diff --git a/meta/recipes-support/libunwind/libunwind-1.1/Link-libunwind-to-libgcc_s-rather-than-libgcc.patch b/meta/recipes-support/libunwind/libunwind-1.1/Link-libunwind-to-libgcc_s-rather-than-libgcc.patch
> new file mode 100644
> index 0000000..0e55c91
> --- /dev/null
> +++ b/meta/recipes-support/libunwind/libunwind-1.1/Link-libunwind-to-libgcc_s-rather-than-libgcc.patch
> @@ -0,0 +1,42 @@
> +From 508ca17a7be01d1cc960d9a07d0af4513948fb8d Mon Sep 17 00:00:00 2001
> +From: Thierry Reding <treding at nvidia.com>
> +Date: Fri, 27 Jun 2014 08:40:33 +0200
> +Subject: [PATCH] Link libunwind to libgcc_s rather than libgcc
> +
> +For some architectures, -lgcc and -lgcc_s are not equivalent. On ARM for
> +example, libgcc_s.so.1 contains some symbols needed by libunwind which
> +are not present in libgcc.
> +
> +This causes the following link error when building the X.Org X server
> +with libunwind support:
> +
> +	  CCLD     Xorg
> +	/usr/lib/libunwind.so: undefined reference to `__aeabi_unwind_cpp_pr0'
> +	/usr/lib/libunwind.so: undefined reference to `__aeabi_unwind_cpp_pr1'
> +
> +Linking against libgcc_s explicitly solves this problem.
> +

have you tried it at runtime too ?