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Subject: Re: [boost] Debugging optimisation unstable code - Stack and other tools
From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2015-01-22 11:25:55

On 22 Jan 2015 at 16:17, Fletcher, John P wrote:

> >> I am working to get the bugs out of Phoenix and have a situation where some tests are optimisation unstable - they run on Clang 3.5 with -O1 but not -O2 and on gcc 4.9.0 with -O0 but not -O1. The higher optimisation gives an erroneous return value.
> >>
> >> I am looking for tools to work with this.
> I want to try making finer grained optimization but have not succeeded yet.

I assume you've tried turning off aliasing optimisation but otherwise
with optimisation on?

Weird failures with O2 not seen on O1 are usually aliasing bugs in my


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