[Buildroot] [PATCH 1/1] shadowsocks-libev: fix sync handling

[Thomas Petazzoni]

Hello,

On Sun, 10 Jun 2018 01:01:04 -0700, Min Xu wrote:
> To fixup linking errors:
> "undefined reference to `__sync_val_compare_and_swap_4'"
> Fixes
> http://autobuild.buildroot.net/results/552b09ffe951c429422529c895f4c3ec723cf5ab
> 
> http://autobuild.buildroot.net/results/4810526381e15a194767753d324875bfbf5e3dde
> http://autobuild.buildroot.net/results/9cb76805c2f2952aa434d143831ee03c7d43aa52
> 
> http://autobuild.buildroot.net/results/d00c5f9e1e7a6a40fac5763a06977b351b7875da
> http://autobuild.buildroot.net/results/0612f2dc09a8763fdf2111ee8d0c223c8531262a
> 
> delete unused hash info.
> 
> Signed-off-by: Min Xu <xuminready at gmail.com>
> ---
>  package/shadowsocks-libev/Config.in              | 10 ++++++++++
>  package/shadowsocks-libev/shadowsocks-libev.hash |  1 -
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/package/shadowsocks-libev/Config.in b/package/shadowsocks-libev/Config.in
> index d02e5a93ef..1ec4f35bf3 100644
> --- a/package/shadowsocks-libev/Config.in
> +++ b/package/shadowsocks-libev/Config.in
> @@ -1,5 +1,15 @@
> +# It requires __sync_*() intrinsics:
> +# the 4-byte ones on 32 bits architectures, and the 4-byte and 8-byte
> +#   one on 64 bits architecture
> +config BR2_PACKAGE_SHADOWSOCKS_LIBEV_ARCH_SUPPORTS
> +	bool
> +	default y if BR2_TOOLCHAIN_HAS_SYNC_4 && !BR2_ARCH_IS_64
> +	default y if BR2_TOOLCHAIN_HAS_SYNC_4 && BR2_TOOLCHAIN_HAS_SYNC_8 && BR2_ARCH_IS_64

This could perhaps be written a bit more simply:

config BR2_PACKAGE_SHADOWSOCKS_LIBEV_ARCH_SUPPORTS
	bool
	default y
	depends on BR2_TOOLCHAIN_HAS_SYNC_4
	depends on BR2_TOOLCHAIN_HAS_SYNC_8 || !BR2_ARCH_IS_64

>  config BR2_PACKAGE_SHADOWSOCKS_LIBEV
>  	bool "shadowsocks-libev"
> +	depends on BR2_PACKAGE_SHADOWSOCKS_LIBEV_ARCH_SUPPORTS
> +	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL

What is this new NPTL thread dependency ? It isn't described in the
commit log.

>  	depends on BR2_USE_MMU # fork()
>  	select BR2_PACKAGE_C_ARES
>  	select BR2_PACKAGE_LIBEV
> diff --git a/package/shadowsocks-libev/shadowsocks-libev.hash b/package/shadowsocks-libev/shadowsocks-libev.hash
> index e8be8a8a71..fffe9fddf0 100644
> --- a/package/shadowsocks-libev/shadowsocks-libev.hash
> +++ b/package/shadowsocks-libev/shadowsocks-libev.hash
> @@ -5,4 +5,3 @@ sha256 5521cf623a07fd1e393528516a83acd2b66c5d4bb4535a52662806a6a060c606 shadowso
>  sha256 736883f97d44dbec288bb82819f18f4f86d02ae3192f6a9abefa00db76bace41  COPYING
>  sha256 c41a4bc2c4c43e4daa3051e77e31b2d5c8500498afaeac6d831d55a4bb8de3fb  libbloom/LICENSE
>  sha256 4fa2ada54f8c0410ec243265378242ffe862386d5ac517f8dd30a1911d25ae93  libcork/COPYING
> -sha256 4b3adc9ce620fa868f1dda328203dbccbd3e9f5fbafb49c581edc386a504ee1a  libipset/LICENSE.txt

It would be good to do separate patches for separate changes:

 - Adding the NPTL thread dependency (don't forgot to add a Config.in
   comment for it)

 - Adding the __sync related dependency

 - Drop the useless hash.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com