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Date: Tue, 14 Oct 2014 17:33:42 +0200
From: Szabolcs Nagy <>
Subject: Re: RE???[BUG][math]build musl with optimizing flags, some
 math functions are broken.

* bobodog <> [2014-10-14 15:09:45 +0800]:
> Further confirmation, the problem is -ffast-math flag, just remove this flag, all tests passed, please fix this bug, the openbsd's msun math library, have not any problem with this flags.

how did you verify that openbsd "have not any problem with this flag" ?

(without looking at your methodology i can guarantee that openbsd
msun math library is completely broken with gcc -ffast-math too

unless openbsd explicitly disabled this option in their compiler..
they maintain their own compiler so they can implement -ffast-math
as a no-op, but a modern unpatched gcc with -ffast-math breaks all
math functions which depend on exact ieee arithmetics)

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