Public bug reported:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.04
Release: 15.04
Codename: vivid
$ gcc --version
gcc (Ubuntu/Linaro 4.9.2-10ubuntu13) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc -dumpmachine
aarch64-linux-gnu
$ gcc -O0 -std=c11 repro.c ; ./a.out ; echo $? # repro.c attached
0
$ gcc -O2 -std=c11 repro.c ; ./a.out ; echo $?
1
I don't think this program triggers any undefined behavior, so the
optimized version is miscompiled.
I wasn't able to reproduce this with with vanilla 4.9.2.
** Affects: gcc-4.9 (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "program exhibiting the bug"
https://bugs.launchpad.net/bugs/1474304/+attachment/4428649/+files/repro.c
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https://bugs.launchpad.net/bugs/1474304
Title:
miscompilation with conditional operator side effects (ARM64)
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