From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Thu, 11 Aug 2016 15:04:25 +0200 Subject: [Buildroot] [PATCH 1/2] libaio: work-around for PowerPC issue In-Reply-To: <1470866453-16903-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1470866453-16903-1-git-send-email-thomas.petazzoni@free-electrons.com> Message-ID: <20160811150425.3425744b@free-electrons.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello, On Thu, 11 Aug 2016 00:00:52 +0200, Thomas Petazzoni wrote: > Both the blktrace and gadgetfs-test packages were failing to build on > PowerPC due to the mysterious: > > hidden symbol `_rest32gpr_30_x' in libgcc.a(e500crtresx32gpr.o) is referenced by DSO > > Due to this error, we disabled blktrace on PowerPC in commit > 0d8158fc619ce849b531d07b27da4ba9748d4ea4. However, gadgetfs-test > continued to fail with the same error. As Romain Naour pointed out, the > problem seems in fact to come from a common dependency of blktrace and > gadgetfs-test: libaio. As Romain investigated, the problem started > appearing after the last bump of libaio, from version 0.3.109 to > 0.3.110. > > A quick bisect through the libaio changes between 0.3.109 and 0.3.110 > has revealed that the problematic change is one in the libaio build > system, which now obeys to the CFLAGS provided in the environment, > rather than overriding them. So the CFLAGS provided by Buildroot cause > this problem. It turns out that the problematic CFLAGS is -Os, which is > indeed known to cause issues on PowerPC in some corner cases. > > Even though it would probably be a better long-term solution to switch > to -O2 by default, and mark -Os as not available on PowerPC, it is a too > radical change so close to 2016.08. So we simply adjust the libaio > package so that it uses -O2 instead of -Os. > > Fixes: > > http://autobuild.buildroot.net/results/5e6cc4c432ce6c964ac285026978ad14d9eae97c/ > > Signed-off-by: Thomas Petazzoni > --- > package/libaio/libaio.mk | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) Both patches applied. Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com