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Date: Thu, 13 Sep 2012 09:42:52 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Stefan Farfeleder <stefanf@FreeBSD.org>
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Cc: Ian Lepore <freebsd@damnhippie.dyndns.org>,
	Tijl Coosemans <tijl@coosemans.org>, current@FreeBSD.org,
	Dimitry Andric <dim@FreeBSD.org>, toolchain@FreeBSD.org,
	Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Subject: Re: Clang as default compiler November 4th
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On Thu, Sep 13, 2012 at 06:25:37PM +0200, Stefan Farfeleder wrote:
> On Thu, Sep 13, 2012 at 09:10:24AM -0700, Steve Kargl wrote:
> > clang -O2 -pipe -march=opteron -O0 -lm  test-cexp.c  -o test-cexp
> > test-cexp.c:49:14: warning: pragma STDC FENV_ACCESS ON is not supported, ignoring pragma [-Wunknown-pragmas]
> > #pragma STDC FENV_ACCESS        ON
> 
> [...]
> 
> > So, clang does not support "#pragma STDC FENV_ACCESS ON".
> > That (IMHO) is a show stopper for clang as the default compiler,
> > because at least msun/src/e_sqrtl.c uses this pragma.
> 
> Neither does gcc, AFAIK (http://gcc.gnu.org/c99status.html). It just
> silently ignores the pragma.
> 

Hmmm, indeed, you are correct.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34678

I seems to have mis-remembered a patch that went
into newer gcc.

-- 
Steve