From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48216) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNgUD-0000MH-QS for qemu-devel@nongnu.org; Thu, 14 Jul 2016 09:15:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bNgU8-00037c-KR for qemu-devel@nongnu.org; Thu, 14 Jul 2016 09:15:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34936) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNgU8-00037X-EG for qemu-devel@nongnu.org; Thu, 14 Jul 2016 09:15:24 -0400 References: <1465557378-24105-1-git-send-email-dgilbert@redhat.com> <1465557378-24105-3-git-send-email-dgilbert@redhat.com> <20160714131355.GA24499@codeaurora.org> From: Paolo Bonzini Message-ID: <44bd9275-b1d0-63fb-afaf-9a119e513a09@redhat.com> Date: Thu, 14 Jul 2016 15:15:19 +0200 MIME-Version: 1.0 In-Reply-To: <20160714131355.GA24499@codeaurora.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v3 2/2] avx2 configure: Use primitives in test List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Aaron Lindsay , "Dr. David Alan Gilbert (git)" Cc: qemu-devel@nongnu.org, peter.maydell@linaro.org, amit.shah@redhat.com, liang.z.li@intel.com, quintela@redhat.com On 14/07/2016 15:13, Aaron Lindsay wrote: > On Jun 10 12:16, Dr. David Alan Gilbert (git) wrote: >> From: "Dr. David Alan Gilbert" >> >> Use the avx2 primitives during the test, thus making sure that the >> compiler and assembler could actually use avx2. >> >> This also detects the failure case on gcc 4.8.x with -save-temps >> and avoids the need for the gcc version check in cutils. > > I'm getting a segfault when running the latest tip compiled with gcc > 4.8.4 on Ubuntu 14.04 and I've bisected it to this commit. > > # gcc --version > gcc (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4 > > I'm configuring with: > # ./configure \ > --static \ > --disable-gtk \ > --target-list=aarch64-softmmu > > When run under gdb, I get: > Program received signal SIGSEGV, Segmentation fault. > buffer_find_nonzero_offset_ifunc () at ./util/cutils.c:333 > 333 { > (gdb) bt > #0 buffer_find_nonzero_offset_ifunc () at ./util/cutils.c:333 > #1 0x0000000000939c58 in __libc_start_main () > #2 0x0000000000419337 in _start () > > I confess I don't understand the intricacies here, but I'm willing to > test fixes if you have any ideas for how to make this also work for my > compiler without blindly excluding all gcc < 4.9. Hmm, it's possible that we have to disable ifunc together with --static. Paolo