[Buildroot] [arc-buildroot] [autobuild.buildroot.net] arc build results for 2015-06-28

[Alexey Brodkin <Alexey.Brodkin@synopsys.com>]

On Wed, 2015-07-08 at 14:29 +0200, Thomas Petazzoni wrote:
> I have changed
> http://autobuild.buildroot.org/toolchains/configs/br-arm-full-nothread.config
> just yesterday. You're using the new version, I was using the previous
> version. Try again with this defconfig, and you will see the build
> succeed:
> 
> BR2_arm=y
> BR2_arm1176jzf_s=y
> BR2_TOOLCHAIN_EXTERNAL=y
> BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
> BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
> BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.org/toolchains/tarballs/br-arm11-full-nothread-2015.05.tar.bz2"
> BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_0=y
> BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
> # BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS is not set
> BR2_TOOLCHAIN_EXTERNAL_INET_RPC=y
> BR2_TOOLCHAIN_EXTERNAL_CXX=y
> BR2_PACKAGE_EMPTY=y

Ok I now see the difference.

[1] Toolchain that builds "empty" successfully is based on uClibc-0.9.33.2
which simply doesn't have "uClibc_posix_opt.h" where _POSIX_SEMAPHORES
is undefed in more recent versions of uClibc be it uClibc-ng or up to date uClibc
(tip of upstream uClibc's master branch in case of ARC).

See commit that happened 1 month after 0.9.33.2 was cut:
http://git.uclibc.org/uClibc/commit/libc/sysdeps/linux/common/bits/uClibc_posix_opt.h?id=2389017f787dd51e11e697c448071ec
dd217169a

In that commit "uClibc_posix_opt.h" was introduced and since then "empty"
won't built without threads.

Mystery solved? :)

-Alexey