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Date: Fri, 31 Oct 2014 14:16:02 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCH] Error when built with -ffast-math. On Fri, Oct 31, 2014 at 11:07:25AM -0700, Isaac Dunham wrote: > There was a bug report from someone who turned it on without knowing this. > --- > src/internal/libm.h | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/src/internal/libm.h b/src/internal/libm.h > index ebcd784..f8afe5d 100644 > --- a/src/internal/libm.h > +++ b/src/internal/libm.h > @@ -19,6 +19,10 @@ > #include <complex.h> > #include <endian.h> > > +#ifdef __FAST_MATH__ > +#error Using -ffast-math to compile libc will break > +#endif > + It may be desirable to catch broken build configurations (in fact we're already doing it for wrong long double type), but if we want to expand this perhaps it should be unified in one place rather than spread out. Also I'm not clear whether the problem is the -ffast-math option itself. From what I can tell, it's just a meta option that turns on other options, and turning on these options individually without using -ffast-math would equally break things. I'm not rejecting this but I think we should discuss it a bit first and find the best way to catch problems like this if we're going to. Rich
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