r194405 - Improve the documentation of the optimization flags

[Chandler Carruth]

On Mon, Nov 11, 2013 at 11:46 AM, Hal Finkel <hfinkel at anl.gov> wrote:

> As I recall, this is currently -O3 -ffast-math -fstrict-aliasing, and we
> might as well say so.


I would really like to discourage any use of -Ofast. I like having '-f...'
flags for semantic changes. I consider supporting '-Ofast' a necessity to
cope with legacy projects and build systems that expect it to behave "like
it does in GCC".
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