Re: BUG #14897: Segfault on statitics SQL request

Michael Paquier <michael(dot)paquier(at)gmail(dot)com> writes:
> On Sat, Nov 11, 2017 at 8:06 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> My Fedora box thinks __alignof__(__int128) is 16, which is suspicious,
>> but it's not crashing.

> My laptop uses Arch, and I can see the crash easily when compiling
> with gcc 7.2 which is the one bundled in the core package set:

In hopes of reproducing this bug locally, I updated my Fedora laptop
to F26, which has gcc 7.2.1. But I still can't get it to generate any
SIMD instructions for numeric.c, even after considerable fooling about
with -march and related compiler flags. I wonder whether Arch is
enabling some bleeding-edge gcc build flags that Red Hat doesn't trust
yet. It might be interesting to compare outputs of "gcc -v". Mine is

$ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --enable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)

regards, tom lane