From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/7857 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: time.h define NULL Date: Tue, 02 Jun 2015 13:32:58 +0200 Message-ID: <1433244778.3572.3.camel@inria.fr> References: <1433236180.2010.17.camel@xiaoka.com> <20150602093553.GA10927@port70.net> <1433243791.2010.21.camel@xiaoka.com> 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="=-yB25g3H51BGsBXFbcYNm" X-Trace: ger.gmane.org 1433244799 634 80.91.229.3 (2 Jun 2015 11:33:19 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 2 Jun 2015 11:33:19 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-7870-gllmg-musl=m.gmane.org@lists.openwall.com Tue Jun 02 13:33:19 2015 Return-path: Envelope-to: gllmg-musl@m.gmane.org 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.12.9-1+b1 Xref: news.gmane.org gmane.linux.lib.musl.general:7857 Archived-At: --=-yB25g3H51BGsBXFbcYNm Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Dienstag, den 02.06.2015, 13:16 +0200 schrieb Tomasz Sterna: > Dnia 2015-06-02, wto o godzinie 11:35 +0200, Szabolcs Nagy pisze: > > > Why does time.h unconditionally define NULL [1]? > > because it is required >=20 > Required by what? because the C standard says so > > > /usr/include/time.h:11:9: warning: 'NULL' macro redefined > > > [-Wmacro-redefined] > > > #define NULL 0L > > > ^ > > what is the previous definition? > > and why is that conflicting? >=20 > Previous definition is: > #define NULL (0) >=20 > it is in one of headers of the application I'm trying to build against > musl. This is a bug. An application should never redefine a standard macro > Even if it is required by time.h, shouldn't it be guarded by #ifndef > NULL? time.h is not stand-alone unit and is designed to be included to > other software. No. As you can see both defininitions are different, no only syntactical, but also one has type int and the other long. An application should never be able to overwrite a standard macro, but things should error out as they do for you. Jens --=20 :: INRIA Nancy Grand Est ::: Camus ::::::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-yB25g3H51BGsBXFbcYNm 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 v2 iEYEABECAAYFAlVtlGoACgkQD9PoadrVN+L+fgCfSb6ICR9XkpbOl9RwntxTO4im PRMAnj4pYFQq318+34XkpKb4i1aSCxjm =Sr2d -----END PGP SIGNATURE----- --=-yB25g3H51BGsBXFbcYNm--