William F Pokorny <ano### [at] anonymousorg> wrote:
> On 6/22/24 01:35, William F Pokorny wrote:
> > If the user posting in that issue was correct about g++13 turning on the
> > -fno-finite-math-only along with -ffast-math by default and it being the
> > cause of the problem, the safest thing to do is to configure with -fno-
> > fast-math (*) or use -fno-finite-math-only as suggested. (I cannot
> > reproduce the problem by turning finite-math-only on with my g++11.4
> > compiler...)
>
> Update.
>
> I upgraded from Ubuntu 22.04 to Ubuntu 24.04 over the weekend. The
> default g++ compiler is now 13.2.0 and builds do need to use the
> -fno-finite-math-only flag when using -ffast-math (*) with g++13 builds.
>
> Rather than the camera issue, with yuqk, I see the 'bounding not working
> issue' issue reported in some fora here during the past year.
>
> I expect given the different code bases, what will be seen as problems
> with g++13 builds will be varied. This includes introducing problems
> which might not be immediately apparent - the camera issues shows up
> more or less by chance for example, because of a test not really in play
> when it fails...
>
> (I've not gotten around to re-building my collection of official releases.)
>
> Bill P.
>
> (*) - The default linux/unix builds with official releases use
> -ffast-math. The yuqk fork as shipped does not assume any compiler
> flags, but it does recommend -ffast-math with performance builds
> suggested in INSTALL.txt.  (**)
>
> (**) - I've only lightly read up on the current g++13 --fast-math
> issues. However, it looks like gcc/g++ 13 plans to eventually back out
> the library changes creating the POV-Ray g++13 build exposures.
> Practically though, I think it best to always use -fno-finite-math-only
> when using -ffast-math with g++13 given we might not 'see' all the
> possible problems.

Sorry I reread the thread more carefully and saw there WAS objection, though I
did not understand it! it looks bad, but does your answer suggest another
workaround? something as easy to apply by the profane as such a patch?

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