[Bug c/105950] > O2 optimization causes runtime (SIGILL) during main initialization

[jkanapes at yahoo dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105950

--- Comment #13 from John Kanapes <jkanapes at yahoo dot com> ---
(In reply to Jakub Jelinek from comment #12)
> (In reply to John Kanapes from comment #11)
> > (In reply to Richard Biener from comment #9)

> 
> > I am trying to recreate this bug in a smaller, more concise context.
> > It is not an obvious bug. This is valid code, and it takes a large chain of
> > previous steps to get it wrong at runtime. It used to work with previous
> > gccs, but it now seems broken:(
> 
> Claiming it is valid code until it is analyzed is premature.  It can very
> well be undefined behavior in the code.

True. Except that I have already analyzed it with my own tools. That means that
the offending code, as reported by gdb, compiles and runs fine with -O6
optimization with a simpler code. I am not claiming anything, just stressing
that this is not an obvious issue as reported by gdb, and requires a lot of
previous steps to reproduce:(