From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/6652 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: [PATCH 1/4] the CMPLX macros must be usable in initializations of static variables Date: Tue, 02 Dec 2014 23:00:12 +0100 Message-ID: <1417557612.4936.1138.camel@eris.loria.fr> References: <1417007215.28402.107.camel@eris.loria.fr> <20141202174940.GB29621@brightrain.aerifal.cx> <1417547432.4936.1103.camel@eris.loria.fr> <20141202194210.GF29621@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-ZtpSlPhu4gt8fvBnBXH/" X-Trace: ger.gmane.org 1417557637 3171 80.91.229.3 (2 Dec 2014 22:00:37 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 2 Dec 2014 22:00:37 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-6665-gllmg-musl=m.gmane.org@lists.openwall.com Tue Dec 02 23:00:30 2014 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1XvvUf-0008DZ-M2 for gllmg-musl@m.gmane.org; Tue, 02 Dec 2014 23:00:25 +0100 Original-Received: (qmail 11647 invoked by uid 550); 2 Dec 2014 22:00:24 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 11637 invoked from network); 2 Dec 2014 22:00:24 -0000 X-IronPort-AV: E=Sophos;i="5.07,503,1413237600"; d="scan'";a="110789865" In-Reply-To: <20141202194210.GF29621@brightrain.aerifal.cx> Face: 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.4.4-3 Xref: news.gmane.org gmane.linux.lib.musl.general:6652 Archived-At: --=-ZtpSlPhu4gt8fvBnBXH/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Dienstag, den 02.12.2014, 14:42 -0500 schrieb Rich Felker: > On Tue, Dec 02, 2014 at 08:10:32PM +0100, Jens Gustedt wrote: > > > Does clang not support the GCC builtin? > >=20 > > no, and I don't have the impression they will. They invented their own > > internals for this, as you can see here. >=20 > Yes, but their form is a bug that needs to be removed, so they'll have > to add something in its place, and __builtin_complex is the natural > choice. For what it's worth, glibc only supports __builtin_complex and > just does not define these macros at all if it's not supported. you mean it is a bug because the two-value-initializer is a constraint violation? It only is a bug that has to be diagnosed if user code is using it. Internals as long they are not visible to the user isn't covered by this, I think. And this is exactly the reason why the macros have been introduced in C11, to hide such cruft from the user's eye :) > > > My preference would be if we could just define CMPLX either in terms > > > of __builtin_complex, > >=20 > > not possible, I think >=20 > Well, it's what glibc does. That's not to say it's a good choice, but > it suggests there could be pressure to get other compilers to support > it. and that's then one of the points where they aren't C11 conforming when compiled with other compilers > > > and only exposing it in C11 mode. > >=20 > > this is already the case. (Or is it C1x that bothers you?) >=20 > I did find the 201000L comparison a bit odd (is that the "C1x" thing?) yes > but my comment here wasn't in reference to your proposal being > different from the ideal I'd like to have, just a statement of the > latter. ok > > > _Imaginary_I > > > is not supported yet at all and would require further changes to this > > > header to add anyway (this header is responsible for defining it), so > > > conditioning on its definition is not meaningful. > >=20 > > I am not sure of that. It could also come directly from the compiler > > just as it defines some __SOMETHING__ macros before any include >=20 > I don't think so. Consider: >=20 > #undef _Imaginary_I > #include >=20 > Perhaps this is non-conforming for technical reasons, it is non-conforming > but the standard > is fairly direct in saying that complex.h defines the _Imaginary_I > macro rather than just having it predefined. but it also says =C2=BB Implementations that define the macro __STDC_NO_COMPLEX__ need not = provide =C2=BB this header nor support any of its facilities. so any of the facilities *may* be provided anyhow. (and since _Imaginary_I is reserved it is allowed to do that in any case.) But if you want to avoid that branch, I understand. _Imaginary_I would be *the* way to solve all of this easily, sigh. > > > And pre-4.7 versions > > > of GCC don't support C11 anyway (and even 4.7 and 4.8 are highly > > > incomplete) so I don't think much is lost if a C11 feature fails to > > > work on older compilers. > >=20 > > as said, there is no intention to support it for older compilers. So I > > read it that you want me to pull the definition of the __CMPLX > > versions into the C1x conditional? >=20 > I'm not sure I follow what you're saying here. The text you quoted was > in regards to my hope of just having a single definition, not a > specific request for any particular changes to your proposed patch. >=20 > > > The big question is how this fares for clang > > > compatibility though. I expect pcc and cparser/firm will provide a > > > compatible __builtin_complex (if they don't already) as they improve > > > C11 support. > > >=20 > > > > diff --git a/src/internal/libm.h b/src/internal/libm.h > > > > index ebcd784..f916e2e 100644 > > > > --- a/src/internal/libm.h > > > > +++ b/src/internal/libm.h > > > > @@ -155,4 +155,12 @@ long double __tanl(long double, long double, i= nt); > > > > long double __polevll(long double, const long double *, int); > > > > long double __p1evll(long double, const long double *, int); > > > > =20 > > > > +/* complex */ > > > > + > > > > +#ifndef CMPLX > > > > +#define CMPLX(x, y) __CMPLX_NC(x, y, double) > > > > +#define CMPLXF(x, y) __CMPLX_NC(x, y, float) > > > > +#define CMPLXL(x, y) __CMPLX_NC(x, y, long double) > > > > +#endif > > > > + > > > > #endif > > >=20 > > > This should probably use the unions unconditionally, after including > > > complex.h and #undef'ing CMPLX[FL], since musl does not require a C11 > > > compiler to build it. Depending on whether a fallback is provided for > > > old compilers or not, I think your approach could lead to musl being > > > miscompiled. It probably doesn't happen since CMPLX is no longer > > > exposed except in C11 mode, and musl is compiled with -std=3Dc99, but > > > this looks fragile and could cause breakage to go unnoticed if we > > > switch to preferring -std=3Dc11 some time later. (There's been talk o= f > > > preferring -std=3Dc11 if it works.) > >=20 > > Hm, clearly not my preference. I think we should use the right tool > > (which is __builtin_complex for gcc or the bogus initializer for > > clang) as soon as we have it. > >=20 > > This is why I wanted to have the detection of the features as early as > > possible where it belongs to my opinion, complex.h. > >=20 > > They have more chances to optimize things correctly without > > temporaries even when compiled without optimization. >=20 > As stated in another thread, my preference is highly towards not > having multiple versions of the same code, especially when one or more > are unlikely to get good testing. The "more chance to optimize" > argument does not apply unless there really are compilers which > compile the unions poorly (not counting intentional non-optimizing > modes) and I'm not aware of any. ok, I'll prepare a new version according to that Jens --=20 :: INRIA Nancy Grand Est ::: AlGorille ::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-ZtpSlPhu4gt8fvBnBXH/ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEABECAAYFAlR+NmwACgkQD9PoadrVN+LQVQCeNy5gVUHv3FCnjKD5GlT40L59 fT0AoJxb4aESXRkMV+hfp55ETjetYeH2 =Q/rL -----END PGP SIGNATURE----- --=-ZtpSlPhu4gt8fvBnBXH/--