[Buildroot] [PATCH 2/2] package/libunwind: disable for x86 with uClibc toolchain

[Yann E. MORIN]

On 2017-04-16 21:49 +0200, Romain Naour spake thusly:
> libunwind use sigreturn() while building for x86 [1] but this function
> is not available with uClibc-ng.
> 
> 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 fail to build:

It's not only about libunwind-generic.so, see below...

> [...]usr/lib/libunwind-generic.so: undefined reference to `sigreturn'
> collect2: error: ld returned 1 exit status
> 
> Disable libunwind for x86 target when uClibc-ng is used.
> 
> Fixes:
> http://autobuild.buildroot.net/results/54a/54afac8148cff5f3c17e83f80917fd9006948fe0//build-end.log

... as it lso fixes:
http://autobuild.buildroot.org/results/0d1/0d1da7fa32b2f659816c51a05de96f26fef163e4/build-end.log

[...]/output/host/usr/i686-buildroot-linux-uclibc/sysroot/usr/lib/libunwind.so:
undefined reference to `sigreturn'

Tested-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Acked-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>

Regards,
Yann E. MORIN.

> 
> [1] http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=blob;f=src/x86/Gos-linux.c;h=17aebc2974af50eb0bf8292689b2ed22a4c97866;hb=HEAD#l299
> 
> Signed-off-by: Romain Naour <romain.naour at gmail.com>
> ---
>  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 5527a2b..9007ce5 100644
> --- a/package/libunwind/Config.in
> +++ b/package/libunwind/Config.in
> @@ -15,7 +15,7 @@ config BR2_PACKAGE_LIBUNWIND_ARCH_SUPPORTS
>  		 BR2_mips64el || BR2_powerpc || BR2_sh || BR2_i386 || BR2_x86_64)
>  	default y if BR2_TOOLCHAIN_USES_UCLIBC && \
>  		(((BR2_arm || BR2_armeb) && BR2_ARM_CPU_HAS_ARM) || \
> -		 BR2_i386 || BR2_mips || BR2_mipsel || \
> +		 BR2_mips || BR2_mipsel || \
>  		 BR2_mips64 || BR2_mips64el || BR2_x86_64)
>  	default y if BR2_TOOLCHAIN_USES_MUSL && \
>  		(((BR2_arm || BR2_armeb) && BR2_ARM_CPU_HAS_ARM) || \
> -- 
> 2.9.3
> 
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