[Buildroot] [PATCH] package/libunwind: disable for x86 with musl
Yann E. MORIN
yann.morin.1998 at free.fr
Mon Apr 17 19:07:21 UTC 2017
Romain, All,
On 2017-04-17 19:37 +0200, Romain Naour spake thusly:
> libunwind use sigreturn() and setcontext() while building for x86 [1]
> but this function is not available with musl [2].
>
> This throw a warning during libunwind build:
> In file included from x86/Los-linux.c:4:0:
> x86/Gos-linux.c: In function ‘_ULx86_local_resume’:
> x86/Gos-linux.c:298:7: warning: implicit declaration of function ‘sigreturn’ [-Wimplicit-function-declaration]
> sigreturn (sc);
> ^
> But any program trying to link against libunwind-generic.so or
> libunwind.so fail to build:
> [...]/usr/lib/libunwind-generic.so: undefined reference to `sigreturn'
> [...]/usr/lib/libunwind-generic.so: undefined reference to `setcontext'
> collect2: error: ld returned 1 exit status
>
> Disable libunwind for x86 target when musl is used.
>
> Reported upstream by Waldemar [3]
>
> [1] http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=blob;f=src/x86/Gos-linux.c;h=17aebc2974af50eb0bf8292689b2ed22a4c97866;hb=HEAD#l299
> [2] http://openwall.com/lists/musl/2016/02/04/3
> [3] http://lists.nongnu.org/archive/html/libunwind-devel/2017-04/msg00030.html
>
> Signed-off-by: Romain Naour <romain.naour at gmail.com>
> Cc: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> Cc: Waldemar Brodkorb <wbx at openadk.org>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Regards,
Yann E. MORIN.
> ---
> Patch rebased after http://patchwork.ozlabs.org/patch/751402/
> ---
> package/libunwind/Config.in | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/package/libunwind/Config.in b/package/libunwind/Config.in
> index 2003e96..1a25317 100644
> --- a/package/libunwind/Config.in
> +++ b/package/libunwind/Config.in
> @@ -16,7 +16,7 @@ config BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
> (BR2_ARM_CPU_HAS_ARM || BR2_mips || BR2_mipsel || \
> BR2_mips64 || BR2_mips64el || BR2_x86_64)
> default y if BR2_TOOLCHAIN_USES_MUSL && \
> - (BR2_ARM_CPU_HAS_ARM || BR2_i386 || BR2_x86_64)
> + (BR2_ARM_CPU_HAS_ARM || BR2_x86_64)
>
> config BR2_PACKAGE_LIBUNWIND
> bool "libunwind"
> --
> 2.9.3
>
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