https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69730
Bug ID: 69730
Summary: problem with references and templates when using O2
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: prevot at cervval dot com
Target Milestone: ---
Created attachment 37640
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37640&action=edit
sample code to trigger the bug
This is kind of hard to describe, so I will refer to the code sample.
Compiling with "g++ -o bug_gcc bug_gcc.cpp && ./bug_gcc" gives the expected
result (outputs twice 0.1), but compiling with "g++ -o bug_gcc -O2 bug_gcc.cpp
&& ./bug_gcc" gives a wrong result (second value is 0).
As a side note compiling with "g++ -o bug_gcc -O2 -fsanitize=undefined
bug_gcc.cpp && ./bug_gcc" gives the expected result.
Version details:
On archlinux using multilib/gcc-multilib 5.3.0-3
$ gcc --version
gcc (GCC) 5.3.0
Copyright (C) 2015 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.
$ uname -a
Linux prevot 4.3.3-3-ARCH #1 SMP PREEMPT Wed Jan 20 08:12:23 CET 2016 x86_64
GNU/Linux
As I don't know how to exactly describe this bug, sorry if this is a
duplicate...
