https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70558
Bug ID: 70558
Summary: POD datatype array crash in initialization when using
optimization
Product: gcc
Version: 5.2.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hlprasu at gmail dot com
Target Milestone: ---
Created attachment 38197
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38197&action=edit
Contains example code to reproduce this problem
I have created a simple POD class named Double, which encapsulates 'double'
type so that comparison operators can be handled in a numerically correct
fashion. This is in the attached .tar.gz file.
My problem is that if a create a fixed array with it and try to initialize all
elements in a single statement then it crashes only when optimization is
enabled.
E.g.:
Double v[3];
v[0] = v[1] = v[2] = 0.0; // <- crash here with -O or -O2 or -O3
Funnily enough, this does not crash if you do
v[0] = 0.0;
v[1] = 0.0;
v[2] = 0.0;
To reproduce this error,
1. Untar the attached file and go to the directory
tar -xvzf double-pod-crash.tar.gz
cd double-pod-crash/
2. Run 'make' and execute the test file.
make
./test # <- This segfaults at the above statement
I saw the crash to be at the above statement by using gdb after recompiling
with -g option.
Please let me know a solution to this problem.
