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Date: Mon, 13 Jul 2009 10:24:58 +0100
From: Dave Korn <dave.korn.cygwin@googlemail.com>
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To: Dave Korn <dave.korn.cygwin@googlemail.com>
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Subject: Re: gcc4: -ffast-math causes segfaults
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Dave Korn wrote:
> Yaakov (Cygwin/X) wrote:

>> Are there any known issues with -ffast-math that I should be aware of?
> 
>   Yes.  -ffaast-math allows the compiler to generate SSE instructions.  This
> is a problem if used with plain uninitialised C common variable declarations,
> because the PE file format doesn't have a way to specify the alignment of
> common section allocations.

  BTW, all this is PR37216:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216

    cheers,
      DaveK

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