From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/4805 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: build with clang-3.4 warnings report Date: Sat, 05 Apr 2014 11:04:58 +0200 Message-ID: <1396688698.11744.258.camel@eris.loria.fr> References: <533F0F1A.6040707@embtoolkit.org> <20140404204701.GO26358@brightrain.aerifal.cx> <533F56FB.8060509@embtoolkit.org> <20140405015443.GU26358@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="=-NENscGV9cZQRVeiBht4g" X-Trace: ger.gmane.org 1396688720 30936 80.91.229.3 (5 Apr 2014 09:05:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 5 Apr 2014 09:05:20 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-4809-gllmg-musl=m.gmane.org@lists.openwall.com 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.2.3-0ubuntu6 Xref: news.gmane.org gmane.linux.lib.musl.general:4805 Archived-At: --=-NENscGV9cZQRVeiBht4g Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello Am Freitag, den 04.04.2014, 21:54 -0400 schrieb Rich Felker: > On Sat, Apr 05, 2014 at 03:06:03AM +0200, Abdoulaye Walsimou Gaye wrote: > > In file included from src/errno/strerror.c:7: > > src/errno/__strerror.h:100:1: warning: implicit conversion from 'int' t= o 'unsigned char' changes value from 1133 to 109 [-Wconstant-conversion] > > 1133, > > ^~~~ > > 1 warning generated. >=20 > Again, I'm confused why we're getting this one. This seems to come from the bogus handling of EDQUOT by mips: /* mips has one error code outside of the 8-bit range due to a * historical typo, so we just remap it. */ This remapping seems only to have been done correctly for the strerror function itself but not for the array declaration. An equivalent patch for that line would be #define E(a,b) (unsigned char)((EDQUOT=3D=3D1133 && (a)=3D=3DEDQUOT) ? 109 = : a), but which makes it only apparent how bogus this is. In the function if (EDQUOT=3D=3D1133) {..} is basically and equivalent of #if MIPS or so but without saying it. (I thought that musl didn't wanted these architecture dependent use of #if/#else). To "repair" the mips problem I would just do I think the real bug is here #define E(a,b) ((unsigned char)a), this is a typical case of someone using a cast to burry a problem, black magic, "casting a spell". As this bug shows, the whole technique of searching the error string in strerror is somehow fragile. The whole thing could be avoided by using designated initializers and eliminating the whole errid array right away. Designated initializers should be present in all decent versions of gcc. Do you want me to prepare a patch? Jens --=20 :: INRIA Nancy Grand Est :: http://www.loria.fr/~gustedt/ :: :: AlGorille ::::::::::::::: office Nancy : +33 383593090 :: :: ICube :::::::::::::: office Strasbourg : +33 368854536 :: :: ::::::::::::::::::::::::::: gsm France : +33 651400183 :: :: :::::::::::::::::::: gsm international : +49 15737185122 :: --=-NENscGV9cZQRVeiBht4g 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 v1.4.11 (GNU/Linux) iEYEABECAAYFAlM/xzoACgkQD9PoadrVN+KGcwCfVsPi12vALXN36h4Ly4Ua+Xn6 K1gAn1pcktGyqO47+0H5CbmjDRnl3/c0 =Pe1G -----END PGP SIGNATURE----- --=-NENscGV9cZQRVeiBht4g--