Date: Thu, 21 May 2009 21:08:31 -0300 From: francis keyes <fkeymo@gmail.com> To: Roland Smith <rsmith@xs4all.nl> Cc: Polytropon <freebsd@edvax.de>, Chuck Robey <chuckr@telenix.org>, freebsd-questions@freebsd.org Subject: Re: compiling FreeBSD date on Linux Message-ID: <d64607cc0905211708u2d2c4e75q95a804f70ce03eb7@mail.gmail.com> In-Reply-To: <20090520192011.GA97805@slackbox.xs4all.nl> References: <d64607cc0905191419p621f7e65tf5515d1d3696bfa0@mail.gmail.com> <20090520000137.3d46fcb2.freebsd@edvax.de> <4A135119.8010007@telenix.org> <d64607cc0905201045i36084a34g2a6c0d4e9d5f750d@mail.gmail.com> <20090520192011.GA97805@slackbox.xs4all.nl>
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I patched date.c and tried to compile but I get a few errors, as you
suspected:
In file included from date.c:59:
vary.h:35: warning: =91struct tm=92 declared inside parameter list
vary.h:35: warning: its scope is only this definition or declaration, which
is probably not what you want
date.c: In function =91main=92:
date.c:85: error: storage size of =91lt=92 isn=92t known
date.c:163: error: invalid type argument of =91unary *=92 (have =91int=92)
date.c:172: warning: incompatible implicit declaration of built-in function
=91strftime=92
date.c: In function =91setthetime=92:
date.c:190: warning: assignment makes pointer from integer without a cast
date.c:191: warning: assignment makes pointer from integer without a cast
date.c:211: warning: assignment makes pointer from integer without a cast
date.c:217: error: dereferencing pointer to incomplete type
date.c:218: error: dereferencing pointer to incomplete type
date.c:221: error: dereferencing pointer to incomplete type
date.c:227: error: dereferencing pointer to incomplete type
date.c:232: error: dereferencing pointer to incomplete type
date.c:234: error: dereferencing pointer to incomplete type
date.c:235: error: dereferencing pointer to incomplete type
date.c:236: error: dereferencing pointer to incomplete type
date.c:238: error: dereferencing pointer to incomplete type
date.c:242: error: dereferencing pointer to incomplete type
date.c:243: error: dereferencing pointer to incomplete type
date.c:245: error: dereferencing pointer to incomplete type
date.c:248: error: dereferencing pointer to incomplete type
date.c:249: error: dereferencing pointer to incomplete type
date.c:253: error: dereferencing pointer to incomplete type
date.c:254: error: dereferencing pointer to incomplete type
date.c:258: error: dereferencing pointer to incomplete type
date.c:259: error: dereferencing pointer to incomplete type
date.c:268: error: dereferencing pointer to incomplete type
On Wed, May 20, 2009 at 4:20 PM, Roland Smith <rsmith@xs4all.nl> wrote:
> On Wed, May 20, 2009 at 02:45:59PM -0300, francis keyes wrote:
> > Hmm... the date program looks pretty simple but I don't understand the
> > Makfile:
> >
> > # @(#)Makefile 8.1 (Berkeley) 5/31/93
> > # $FreeBSD: src/bin/date/Makefile,v 1.11.30.1 2009/04/15 03:14:26
> kensmith
> > Exp $
> >
> > PROG=3D date
> > SRCS=3D date.c netdate.c vary.c
> > DPADD=3D ${LIBUTIL}
> > LDADD=3D -lutil
> >
> > .include <bsd.prog.mk>
> >
> >
> > Would it be possible to compile this without a makefile?
>
> Sure. A command like "gcc -o date date.c netdate.c vary.c" works,
> provided you patch date.c to remove the dependency on libutil (logwtmp
> function). This will stop date from logging to wtmp(5).
>
> ----- patch for date.c -----
> --- date.c.orig 2009-05-04 22:09:01.000000000 +0200
> +++ date.c 2009-05-20 21:05:32.000000000 +0200
> @@ -48,7 +48,7 @@
> #include <ctype.h>
> #include <err.h>
> #include <locale.h>
> -#include <libutil.h>
> +/*#include <libutil.h>*/
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> @@ -274,12 +274,12 @@
> if (!jflag) {
> /* set the time */
> if (nflag || netsettime(tval)) {
> - logwtmp("|", "date", "");
> + /*logwtmp("|", "date", "");*/
> tv.tv_sec =3D tval;
> tv.tv_usec =3D 0;
> if (settimeofday(&tv, (struct timezone *)NULL))
> err(1, "settimeofday (timeval)");
> - logwtmp("{", "date", "");
> + /*logwtmp("{", "date", "");*/
> }
>
> if ((p =3D getlogin()) =3D=3D NULL)
> ----- patch for date.c -----
>
> With this patch, the executable only depends on libc.
>
> Note that I have only confirmed that it compiles _on FreeBSD_. There
> might be additional differences between FreeBSD libc and the GNU libc
> that is used on Linux that make further tinkering with the source
> necessary.
>
> Roland
> --
> R.F.Smith http://www.xs4all.nl/~rsmith/=
<http://www.xs4all.nl/%7Ersmith/>;
> [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
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>
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