# aldus John W. Eaton : > On 5-Aug-2003, Peter Dalgaard BSA <[EMAIL PROTECTED]> wrote: > > | Also, R is generally compiled with -D NO_MATH_INLINES because of some > | ancient messup with glibc. I'm not sure whether that is actually still > | necessary, but it is forcing the use of the non-inlined pow() function. > > I think the origin of this option might be that someone reported a bug > in Octave because exp (-Inf) was returning NaN. The problem turned > out to be that the inline version of exp returns NaN for Inf, NaN, and > -Inf arguments. These days it seems that you don't get the inline > versions unless you use -ffast-math (at least that's what I just now > found with gcc 3.3). Using -DNO_MATH_INLINES might still be needed > for some older GCC compiler/library combinations, so I don't think it > hurts. I'm not sure whether it matters for R, but according to the > glibc math.h header the inline versions also don't set errno.
There were also wrong results with some goniometric function, if I recall correctly. I can't verify it, since I now use a newer version of gcc. To be safe, I always use -DNO_MATH_INLINES. -- Peter Kleiweg http://www.let.rug.nl/~kleiweg/ ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
